Download or read book Characterization of Carbon Nanotubes Based Resistive and Capacitive Gas Sensors written by Ning Ma and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Carbon Nanotube Based Sensors written by Anindya Nag and published by CRC Press. This book was released on 2024-05-02 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanotube-Based Sensors: Fabrication, Characterization, and Implementation highlights the latest research and developments on carbon nanotubes (CNTs) and their applications in sensors and sensing systems. It offers an overview of CNTs, including their synthesis, functionalization, characterization, and toxicology. It then delves into the fabrication and various applications of CNT-based sensors. FEATURES Defines the significance of different forms of CNT-based sensors synthesized for diverse engineering applications and compares the feasibility of their generation Helps readers evaluate different types of fabrication techniques to generate CNTs and their subsequent sensing Discusses fabrication of low-cost, efficient CNTs-based sensors that can be used for diverse applications and sheds light on synthesis methods for a range of printing techniques Highlights challenges and advances in security-related issues using CNTs-based sensors This book is aimed at researchers in the fields of materials and electrical engineering who are interested in the development of sensor technology for industrial, biomedical, and related applications.

Download or read book Electrical Characterization of Carbon Nanotube as Gas Sensing Element written by Farah Aniza Mohd. Yusof and published by . This book was released on 2007 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas sensing is very important in order to detect dangerous gases like carbon dioxide, ammonia and acetylene, which are commonly used in industries as well as in medical applications. Carbon Nanotube is a promising candidate for gas sensing element because of their large surface area. Therefore, they offer excellent sensitivity and rapid response towards surface changes. This work aims to investigate carbon nanotubes as gas sensing element. The growth of carbon nanotube has been done using Chemical Vapor Deposition (CVD) technique. The physical and electrical characteristics of carbon nanotube have been characterized using microscope and source measurement unit. Sensors were fabricated and the variations of electrical resistance upon the exposure of carbon dioxide, ammonia and acetylene gas have been investigated. The technique for growing carbon nanotubes that is called Floating Catalyst CVD has been used to produce grams of carbon nanotube. The temperature was set from 800oC to 900oC. For that rande of temperature, grams of carbon nanotubes are produced on which the diameter is from 40 nm - 20nm and the length is in micrometer. The carbon nanotubes produced are found to have multi-layered wall in about 8nm thickness. The diameter, length and wall thickness have been measured using the Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM) and Transmission Electron Microscope (TEM). The multi-layered wall indicates that the carbon nanotubes are Multi-Walled Carbon Nanotubes (MWNTs). Gas-sensing samples have been prepared in the forms of pellet and films. Upon exposure of carbon dioxide, ammonia and acetylene gas, the resistance of the samples increases from their steady state value. From the research, it was found that the sensor is sensitive to carbon dioxide, ammonia and acetylene gas. The sensor can be operated at room temperature with response time as fast as 0.1 to1 second.

Download or read book Nanostructured Gas Sensors written by Ankur Gupta and published by CRC Press. This book was released on 2023-01-06 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanostructured materials exhibit distinct properties by virtue of their nanoscale morphological variations, which open up endless possibilities to investigate unexplored and interesting applications. This textbook broadly covers the fabrication and characterization of nanostructured films and exploration of their gas-sensing applications. It presents the fundamentals of gas-sensing technology and a comprehensive study on smart gas sensing technology. Readers will find basics, analytical techniques, nanotechnology-enabled experimental findings, and future directions of smart gas-sensing technology at one place. Through the inclusion of up-to-date experimental knowledge of synthesis, processing, and application development, the book is suitable for academics at all levels.

Download or read book Carbon Nanotube Based Sensors written by and published by . This book was released on 2024-05 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: ""Carbon Nanotube-Based Sensors" highlights the latest research and developments on carbon nanotubes (CNTs) and their applications in sensors and sensing systems. It offers an overview of CNTs, including their synthesis, functionalization, characterization, and toxicology. It then delves into the fabrication and various applications of CNT-based sensors. This book is aimed at researchers in the fields of materials and electrical engineering who are interested in the development of sensor technology for industrial, biomedical, and related applications"--

Download or read book Non contact Characterization of Carbon Nanotube Based Strain Sensors Using Millimeter Waves written by Seyda Naz Alasahin and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes (CNTs) are unique tubular structures with high thermal and electrical conductivity, distinct optical characteristics, and high mechanical stiffness and strength. Carbon nanotube (CNT) composites have widely been used as strain sensors because of their electrical-mechanical coupling behavior. Typically, these piezoresistive sensors require direct measurement of electrical resistance change using an external source connected with wires. This research introduces a new, non-contact measurement method to detect the change in electrical conductivity of carbon nanotube-based strain sensors using high-frequency millimeter wave technology. By analyzing the transmission coefficient from the textile-based CNT composite, we were able to observe the piezoresistive effect. Sensors were characterized over a broad frequency band, from 82 GHz to 100 GHz, with applied strain up to 40%. Fabrics were coated with a sizing composed of an aqueous dispersion of multi-walled CNTs. Sets of fabrics with different CNT concentration were examined to investigate the sensitivity, polarization effects and isotropy properties of manufactured sensors under three different case studies.

Download or read book Characterizing the Role of Defects on the Sensing Performance of Carbon Nanotube and Graphene Based Gas Sensors written by Kevin Y. Lin and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The major theme of this thesis is to investigate the influence of defects on the sensing mechanisms and performance of gas sensors made from films of carbon nanotubes, chemical vapor deposition (CVD) graphene film, CVD graphene ribbons, and surfactant exfoliated graphene. The definition of defects on carbon materials is the disordered carbon atoms formed due to dislocations, vacancies, and deformations. These defects were introduced during processing. The thesis is separated into three sections that analyze various types of defects on these carbon based chemical sensors. First section focuses on single-walled carbon nanotubes with point defects. It will be demonstrated that these point defects can alter the main sensing mechanism of the CNT based sensors. There is a controversy in literature on whether the sensing response seen in carbon nanotube chemiresistors is associated with a change in the resistance of the individual carbon nanotubes or changes in the resistance of the junctions. A network analysis was carried out to better understand the relative contributions of the carbon nanotubes and the junctions on the change in resistance of the carbon nanotube network. It was found that the dominant mode of detection in carbon nanotube networks changes according to the defect level in the carbon nanotubes which may explain the apparently contradictory results in the literature. With high concentration of the point defects in the carbon nanotube film along with applying high electric field, the Poole-Frenkle conduction regime can be induced. Generally, desorption of gases from carbon nanotubes is a slow process that limits the carbon nanotubes0́9 utility as sensors. It will be demonstrated that electron flows in the carbon nanotube above the Poole-Frenkel conduction threshold can stimulate adsorbates to desorb without heating the sensor significantly. This desorption process is analogous to electron stimulated desorption, but with an internally conducted rather than externally applied source of electrons. As a result, this gives a fast and reversible CNT sensor within seconds. An application can be utilized to use carbon nanotubes based GC detector for multi-component chemical analysis. The approach is to use a CNT based detector in a series configuration with a gas chromatography column. It will demonstrated that a mixture of nine different compounds can be detected with these CNT based detectors when the detector operates in current stimulated desorption (CSD) mode. This is the first demonstration of a CNT based GC detector to analyze multi-component gas mixtures providing a new sensing approach for online air quality control and health monitoring applications. The second section of the thesis focuses on analyzing two-dimensional line defects arises from wrinkles and grain boundaries as well as edge defected created manually on the graphene film synthesized with chemical vapor deposition (CVD) process. Due to two-dimensional nature of the graphene film, adsorption of isolated analyte molecules on point defects has minimal effect on graphene resistance because current pathways can always form around the adsorbate. In contrast, analytes adsorbing on line defects lead to significant changes in resistance. It will be demonstrated that polycrystalline graphene easily obtained through chemical vapor deposition contains line defects. This can offer a scalable path to 50x more sensitive chemiresistors than mechanically exfoliated crystalline graphene. Moreover, current flow can be confined by cutting the polycrystalline graphene into ribbons, the sensitivity increases by another factor of four. These results show that polycrystalline graphene has extraordinary sensitivity, achieved through geometry and linear defect density. The last section of the thesis focuses on intrinsic two-dimensional edge defects on graphene isolated with sodium cholate surfactant assisted exfoliation of graphite powders. With this technique, it is possible to produce high edge defect concentrations for individual graphene island due to its micron-sized dimension offering more defects per unit area. Various randomly-stacked oxide-free graphene films can be formed with various filtration volumes. It will be demonstrated the films produced can range 6 orders of magnitude in film conductance. At thinner graphene films, the electron transport mechanism is mainly through two-dimensional variable range hopping. At thicker graphene films, electron transport is through fluctuation-assisted tunneling. It is also observed the graphene films go from semiconducting-like to metallic-like behavior at around 8 mL filtration volume. At low filtration volumes, oxide-free randomly stacked graphene film sensors showed better sensitivity towards target molecules compared to polycrystalline/ribbon graphene and defective CNT gas sensors due to two-dimensional electron hopping. As the graphene film thickness increases, there is a shift in conduction mechanism from two-dimensional electron hopping to metallic-like conduction which explains the drop in sensitivity as the filtration volume increases.

Download or read book Solid State Sensors written by Ambarish Paul and published by John Wiley & Sons. This book was released on 2023-10-06 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid-State Sensors A thorough and up-to-date introduction to solid-state sensors, materials, fabrication processes, and applications Solid-State Sensors provides a comprehensive introduction to the field, covering fundamental principles, underlying theories, sensor materials, fabrication technologies, current and possible future applications, and more. Presented in a clear and accessible format, this reader-friendly textbook describes the fundamentals and classification of all major types of solid-state sensors, including piezoresistive, capacitive, thermometric, optical bio-chemical, magnetic, and acoustic-based sensors. Throughout the text, the authors offer insight into how different solid-state methods complement each other as well as their respective advantages and disadvantages in relation to specific devices and a variety of state-of-the-art applications. Detailed yet concise chapters include numerous visual illustrations and comparative tables of different subtypes of sensors for a given application. With in-depth discussion of recent developments, current research, and key challenges in the field of solid-state sensors, this volume: Describes solid-state sensing parameters and their importance in sensor characterization Explores possible future applications and breakthroughs in associated fields of research Covers the fundamental principles and relevant equations of sensing phenomena Discusses promising smart materials that have the potential for sensing applications Includes an overview of the history, classification, and terminology of sensors With well-balanced coverage of the fundamentals of sensor design, current and emerging applications, and the most recent research developments in the field, Solid-State Sensors is an excellent textbook for advanced students and professionals in disciplines such as Electrical and Electronics Engineering, Physics, Chemistry, and Biomedical Engineering.

Download or read book Smart Sensors and Sensing Technology written by Gourab Sen Gupta and published by Springer Science & Business Media. This book was released on 2008-07-01 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technological advancements in recent years have enabled the development of tiny, cheap disposable and self contained battery powered computers, known as sensor nodes or “motes”, which can accept input from an attached sensor, process this input and transmit the results wirelessly to some interested device(s). When a number of these nodes work together, conceivably up to hundreds of thousands, a Wireless Sensor Network (WSN) is formed. Research in the area of wireless sensor networks has become increasingly wid- pread in recent years, partly due to their wide range of potential uses and also partly due to the fact that the technology enabling such networks is now widely available from many di?erent suppliers, such as: Crossbow, MoteIV, Intel and SUN (java based motes). These wireless sensor networks have the potential to allow a level of integration between computers and the physical world that, to date, has been virtually impos- ble. The uses for such networks is almost limitless and include such diverse app- cations as a counter sniper system for urban warfare [1] tracking the path of a forest re [2], determining the structural stability of a building after an earthquake [3], or tracking people or objects inside a building [4], etc.

Download or read book Carbon Based Nanomaterials and Nanocomposites for Gas Sensing written by Navinchandra Gopal Shimpi and published by Elsevier. This book was released on 2022-10-12 with total page 267 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon-Based Nanomaterials and Nanocomposites for Gas Sensing discusses the state of the art, emerging challenges, properties, and opportunities of various carbon-based nanomaterials and nanocomposites, for their application in smart gas sensors. The book focuses on various carbon-based nanomaterials and their nanocomposites, sensing mechanism, device fabrication, and their application for the sensing of various hazardous gases. This is important for several industries, environmental monitoring, and human healthcare, due to increased industrialization. Carbon-Based Nanomaterials and Nanocomposites for Gas Sensing provides systematic and effective guidelines for researchers who want to gain a fundamental understanding of how this class of materials is being used for gas sensing. Since these sensors can be applied for the automation of numerous industrial processes, as well as for everyday monitoring of various activities, such as public safety, engine performance, medical therapeutics, and in many other situations, this book will catch the attention of readers and motivate them for advanced research in the development of smart and efficient gas sensors. - Offers a one-stop resource, bringing together information currently scattered over journal papers and project reports - Presents a focused concept reflecting the properties, synthesis, and sensing capabilities of carbon-based nanomaterials and their composites - Combines fundamental experimental and theoretical information with industrial needs and engineering design methods

Download or read book Carbon Nanomaterials and their Nanocomposite Based Chemiresistive Gas Sensors written by Shivani Dhall and published by Elsevier. This book was released on 2023-01-20 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Nanomaterials and their Nanocomposite-Based Chemiresistive Gas Sensors: Applications, Fabrication and Commercialization sets out how carbon nanomaterials based chemiresistive gas sensor are made, and their applications at lab and industrial levels. The book focuses on major advances in the field of chemiresistive gas sensors in recent years and their potential applications in environmental monitoring and healthcare. Carbon Nanomaterials and their Nanocomposite-Based Chemiresistive Gas Sensors: Applications, Fabrication and Commercialization provides systematic and effective guidelines to the researchers as well as learners about sensor, their fabrication and applications. Chemiresistive sensors are widely used in automation of numerous industrial processes as well as for everyday monitoring of various activities as public safety, engine performance, medical therapeutics, and in many other situations hence the book will catch the attention of readers and motivate them for advanced research for the development of smart and efficient gas sensors. With full coverage of the state of the art in this active research field, the book will appeal to researchers in a broad range of disciplines, including nanotechnology, engineering, materials science, chemistry and physics. - Offers a one-stop resource, bringing together information currently scattered over journal papers, industrial/lab outcomes and project reports - Presents information about the properties, synthesis of nanomaterials, their device fabrication and applications as sensing materials - Combining fundamental, experimental and theoretical knowledge with industrial needs and engineering design methods

Download or read book Gas Sensors Based on Carbon Nanofibers written by Oriol Monereo Cuscó and published by . This book was released on 2016 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas sensors can be found in many activities ranging from environment protection, risk prevention, agriculture and even in food, chemical, and petrochemical industries. There exist different technologies for gas sensors depending on the transduction mechanism: mass-sensitive, optical, calorimetric, magnetic, electrochemical and conductometric. In this work, conductometric (or resistive) gas sensors are studied. Conductometric devices base its operating principle on the variation of the electrical conductivity (resistivity) or conductance (resistance) of a reactive (active) material interacting with gas. A chemical reaction between the active material (surface or bulk) and the gas occurs. This reaction induces a variation on some electrical property of the material resulting in a change on the electrical signal (conductivity or resistivity of the active material) of the sensor. Therefore, the sensor material should be compatible with the mentioned properties above. A carbon based material was chosen to be the reactive compound for the conductometric sensors. This material, a specific type of carbon nanofibers (CNFs), shares some suitable properties with other trendy carbon based materials such as carbon nanotubes or graphene. Conductometric gas sensors usually are composed of two main parts: the already mentioned reactive material and the heater device. The heater is required in order to stabilize the temperature of operation and to activate a desired chemical reaction. Unfortunately, despite the efforts to improve the heater technology, this component is still the most power demanding part of the overall device. The here studied sensors have been characterized with a heater device, but also alternative energy sources and other sensing strategies have been tested in order to reduce the energy cost. Among these, the use of ultraviolet and visible light sources were tested in order to modulate the sensor properties. In addition, another non-common strategy was used to operate the sensor: the so called self-heating effect (or Joule effect). To obtain the electrical signal of a sensor, the reactive material have to be scanned, usually a current (or voltage) is applied to the sensor, then, the voltage (or current) is read. If the probing magnitude is increased, the power dissipation through the sensing material, and its temperature, also increases. Therefore, the sensor could be operated without a heater device with a considerable reduction of its power consumption. Moreover, the self-heating also allows reducing the fabrication complexity, as there is no need of the heater element. In summary, the main objective of this work was to characterize the CNFs as a reactive material for conductometric sensors for low cost applications. First, the CNFs properties (electrical, mechanical, response to light and gases) were screened with the aim to assess the applicability of the sensing material (O. Monereo et al., 2013, Flexible sensor based on carbon nanofibers with multifunctional sensing features). Then, the sensor was tested with the use of temperature modulation (S. Claramunt et al., 2013, Flexible gas sensor array with an embedded heater based on metal decorated carbon nanofibres). At this point, a more detailed characterization of the gas sensing properties with O2, H2O, NO2 and NH3 was conducted. Then, the use of continuous self-heating operation (O. Monereo et al., 2015, Self-heating effects in large arrangements of randomly oriented carbon nanofibers: Application to gas sensors) and pulsed self-heating application (O. Monereo et al., 2016, Self-heating in pulsed mode for signal quality improvement: application to carbon nanostructures-based sensors) were found to be efficient methodologies to modulate the sensing characteristics of sensor devices, based on large arrays of nanostructures. Among the benefits achieved, the sensor presented improvements on stability, specificity, the detection time modulation, all along the simplification of device fabrication and the reduction of the power consumption. Finally, the phenomenon of self-heating in carbon nanofibers and its origin was studied (O. Monereo et al., 2016, Localized self-heating in large arrays of 1D nanostructures). In addition, the use of ultraviolet and visible light as alternative energy sources was also assessed and compared with the self-heating operation. Finally, the applicability of self-heating was also tested in graphene based (reduced graphene oxide) and metal oxide based (ZnO) devices to test the applicability of self-heating in other relevant sensing materials.

Download or read book Testing and Characterization of Carbon Nanotubes as Strain Sensors written by Juan D. Diaz and published by . This book was released on 2011 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: The potential of using carbon nanotube coated flexible cloth as strain gauges was studied. Samples were prepared by sonicating strips of cloth inside a 1mg/ml carbon nanotube in propylene carbonate solution. A dynamic mechanical analyzer was built that applied uniaxial cyclical strains to the samples and recorded the force and strain applied. The DMA also provided a constant voltage to the samples while recording the resistance response of the strain gauges. The samples were tested using the dynamic mechanical analyzer for their response to variables such as strain and time. The samples were successfully tested at strains ranging from 1% to 50%. The conductivity of the samples was measured. We studied the effects that a carboxylate and the sulfonate functional groups of the carbon nanotubes have on the strain sensors, the effect of the sonication time, and the effect that leaving the strain sensors inside the solution for different amount of times has on the strain sensors. It was discovered that the samples dried overtime, thus decreasing the conductivity of the samples and damaging the strain sensors. An encapsulation method was developed and studied to counter the drying effect. The results showed that the encapsulation method did delay the decaying of the samples. Moreover, it was concluded that the sulfonate group had higher changes in resistance than the carboxylate group. While increased sonication time did not seem to have a measurable effect on the resistance of the sulfonate CNT samples, this was not true for the carboxylate group CNTs. The carboxylate group CNTs seemed to have a higher initial resistance with longer sonication time and a lower resistance with increasing time sitting in the solution. Overall, it was concluded that carbon nanotubes have a promising potential as macro level strain sensors for high-elongation applications but more development is yet to be done.

Download or read book Fabrication and Characterization of Carbon Nanotube Thin films for Gas Sensing Applications written by Ahmed Abdelhalim and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of International Conference on Computational Intelligence and Computing written by Jyotsna Kumar Mandal and published by Springer Nature. This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes the original, peer-reviewed research articles from the International Conference on Computational Intelligence and Computing (ICCIC 2020), held in September 2020 on a virtual platform jointly organized by SR Group of Institutions, Jhansi, India, IETE, Kolkata Centre, India, and Eureka Scientech Research Foundation, Kolkata India. It covers the latest research in image processing, computer vision and pattern recognition, machine learning, data mining, big data and analytics, information security and privacy, wireless and sensor networks and IoT applications, artificial intelligence, expert systems, natural language processing, image processing, computer vision, artificial neural networks, fuzzy logic, evolutionary optimization, rough sets, web intelligence, intelligent agent technology, virtual reality, and visualization.

Download or read book Carbon Nanotube and Graphene Nanoribbon Interconnects written by Debaprasad Das and published by CRC Press. This book was released on 2017-12-19 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Alternative to Copper-Based Interconnect Technology With an increase in demand for more circuit components on a single chip, there is a growing need for nanoelectronic devices and their interconnects (a physical connecting medium made of thin metal films between several electrical nodes in a semiconducting chip that transmit signals from one point to another without any distortion). Carbon Nanotube and Graphene Nanoribbon Interconnects explores two new important carbon nanomaterials, carbon nanotube (CNT) and graphene nanoribbon (GNR), and compares them with that of copper-based interconnects. These nanomaterials show almost 1,000 times more current-carrying capacity and significantly higher mean free path than copper. Due to their remarkable properties, CNT and GNR could soon replace traditional copper interconnects. Dedicated to proving their benefits, this book covers the basic theory of CNT and GNR, and provides a comprehensive analysis of the CNT- and GNR-based VLSI interconnects at nanometric dimensions. Explore the Potential Applications of CNT and Graphene for VLSI Circuits The book starts off with a brief introduction of carbon nanomaterials, discusses the latest research, and details the modeling and analysis of CNT and GNR interconnects. It also describes the electrical, thermal, and mechanical properties, and structural behavior of these materials. In addition, it chronicles the progression of these fundamental properties, explores possible engineering applications and growth technologies, and considers applications for CNT and GNR apart from their use in VLSI circuits. Comprising eight chapters this text: Covers the basics of carbon nanotube and graphene nanoribbon Discusses the growth and characterization of carbon nanotube and graphene nanoribbon Presents the modeling of CNT and GNR as future VLSI interconnects Examines the applicability of CNT and GNR in terms of several analysis works Addresses the timing and frequency response of the CNT and GNR interconnects Explores the signal integrity analysis for CNT and GNR interconnects Models and analyzes the applicability of CNT and GNR as power interconnects Considers the future scope of CNT and GNR Beneficial to VLSI designers working in this area, Carbon Nanotube and Graphene Nanoribbon Interconnects provides a complete understanding of carbon-based materials and interconnect technology, and equips the reader with sufficient knowledge about the future scope of research and development for this emerging topic.

Download or read book Synthesis Characterization and Utility of Carbon Nanotube Based Hybrid Sensors in Bioanalytical Applications written by Sushmee Badhulika and published by . This book was released on 2011 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The detection of gaseous analytes and biological molecules is of prime importance in the fields of environmental pollution control, food and water - safety and analysis; and medical diagnostics. This necessitates the development of advanced and improved technology that is reliable, inexpensive and suitable for high volume production. The conventional sensors are often thin film based which lack sensitivity due to the phenomena of current shunting across the charge depleted region when an analyte binds with them. One dimensional (1-D) nanostructures provide a better alternative for sensing applications by eliminating the issue of current shunting due to their 1-D geometries and facilitating device miniaturization and low power operations. Carbon nanotubes (CNTs) are 1-D nanostructures that possess small size, high mechanical strength, high electrical and thermal conductivity and high specific area that have resulted in their wide spread applications in sensor technology. To overcome the issue of low sensitivity of pristine CNTs and to widen their scope, hybrid devices have been fabricated that combine the synergistic properties of CNTs along with materials like metals and conducting polymers (CPs). CPs exhibit electronic, magnetic and optical properties of metals and semiconductors while retaining the processing advantages of polymers. Their high chemical sensitivity, room temperature operation and tunable charge transport properties has made them ideal for use as transducing elements in chemical sensors. In this dissertation, various CNT based hybrid devices such as CNT-conducting polymer and graphene-CNT-metal nanoparticles based sensors have been developed and demonstrated towards bioanalytical applications such as detection of volatile organic compounds (VOCs) and saccharides. Electrochemical polymerization enabled the synthesis of CPs and metal nanoparticles in a simple, cost effective and controlled way on the surface of CNT based platforms thus resulting in the fabrication of hybrid sensors which exhibited superior properties and improved performance when used for sensing applications using various modes of sensor configurations.