Download or read book Laser induced Graphene written by Ruquan Ye and published by . This book was released on 2020-11-30 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: LIG is a revolutionary technique that uses a common CO2 infrared laser scriber, like the one used in any machine shop, for the direct conversion of polymers into porous graphene under ambient conditions. This technique combines the preparation and patterning of 3D graphene in a single step, without the use of wet chemicals. The ease in the structural engineering and excellent mechanical properties of the 3D graphene obtained have made LIG a versatile technique for applications across many fields. This book compiles cutting-edge research on LIG by different research groups all over the world. It discusses the strategies that have been developed to synthesize and engineer graphene, including controlling its properties such as porosity, composition, and surface characteristics. The authors are pioneers in the discovery and development of LIG and the book will appeal to anyone involved in nanotechnology, chemistry, environmental sciences, and device development, especially those with an interest in the synthesis and applications of graphene-based materials.

Download or read book IPRES written by Ruya Li and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently, wearable sensing is an attractive focus of research in the sensing field. Flexible sensors thrive along with the development of wearable technologies because they provide unique features for wearable applications through their compliance and comfort. Resistive, parallel-plate capacitive, and piezoelective based flexible pressure sensors have been investigated over the years for flexible pressure sensing. However, the intrinsic defects of these sensors prevent their application in medical devices, as most applications require high sensitivity, accuracy, and a fast mechanical response. In this dissertation, several types of novel, ion-based pressure sensing devices, referred to as iontronic pressure sensors have been developed with ultrahigh sensitivity, fast mechanical responses, and high flexibility for hemodynamic monitoring applications. Using ultrahigh electrical double layer interfacial capacitance and ionic material resistance, highly sensitive pressure sensing devices are designed and fabricated. Different working modes, resistive and capacitive, are tuned to fit different use scenarios. Parameters that influence device performance, such as sensitivity and mechanical response, are modelled and investigated. A microfluidic film based pressure sensing device that can achieve 0.45 kPa−1 sensitivity within a response time of milliseconds is designed and fabricated for large-area pressure distribution mapping in transparent and flexible package. A novel ionic gel material is implemented with improved device performance using the electrical double layer capacitive mode for sensing. An ionic gel droplet based pressure sensor can achieve a sensitivity of 0.2 nF/mmHg and measures pressure distribution in an array configuration. Further integration of the novel ionic gel within textile generates a new type of ionic pressure sensor that can achieve pressure sensing in all-fabric structures. This novel all-fabric ionic pressure sensor has 0.62 nF/mmHg sensitivity and remains stable when placed on a curved surface with radii decreased to 25 mm. Well-developed iontronic pressure sensors are applied in non-invasive pulse waveform monitoring and chronic venous disorder management. In non-invasive pulse waveform monitoring application, the microfluidic based flexible pressure sensor captures radial arterial pulse waveforms with a matrix configuration when worn on the wrist. Hemodynamic parameters can be calculated based on the waveform acquired to indicate arterial condition of the tested individual. In chronic venous disorder management application, an ionic droplet pressure sensing matrix is integrated into a commercial compression garment to monitor pressure distribution on limbs in a wireless and real-time manner. The iontronic pressure sensors presented offer a highly-transformative solution for wearable health monitoring applications which may benefit patients and clinicians in disease diagnosis, treatment, and rehabilitation.

Download or read book Functional Tactile Sensors written by Ye Zhou and published by Woodhead Publishing. This book was released on 2021-01-20 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Functional Tactile Sensors: Materials, Devices and Integrations focuses on the subject of novel materials design and device integration of tactile sensors for functional applications. The book addresses the design, materials characteristics, device operation principles, specialized device application and mechanisms of the latest reported tactile sensors. The emphasis of the book lies in the materials science aspects of tactile sensors—understanding the relationship between material properties and device performance. It will be an ideal resource for researchers working in materials science, engineering and physics. Includes the latest advances and recent developments in tactile sensors for artificial intelligence applications Reviews the relationship between materials properties and device performance Addresses materials and device design strategies for targeted sensing applications

Download or read book Development of Strain and Pressure Sensors on Flexible and Stretchable Platforms written by Mohammed Mudher Mohammed Ali and published by . This book was released on 2016 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: The capability of the human brain to operate in conjunction with human senses and muscles enables us to become powerful autonomous beings. By using these organs, humans can interact with the surrounding environment. Similarly, the combination of sensors with the signal processing of modern electronics enables the interaction with the non-electrical environment. In this thesis, the work focuses on the design and fabrication of flexible and stretchable sensors which have been receiving an increased interest for applications such as human body movement, tracking in the biomedical industry, object detection, fingerprint sensor as well as for monitoring deformations or structural changes in civil infrastructural assets. This thesis is organized in two projects. In the first project, a printed strain sensor was successfully fabricated, based on a metal-metal composite based strain sensor on a flexible and stretchable thermoplastic polyurethane (TPU) substrate. A silver nanowire (Ag NW)/Ag flake composite ink was screen printed on the TPU substrate as the metal-metal composite. Silver nanowires were chosen as the stretchable filler because of its ability to maintain electrical conductivity under tensile strains. Aa silver flake was chosen due to its viscous nature (12 Pa.s) and good adhesion properties, and both materials are compatible with the screen printing process. The capability of the fabricated strain sensor was demonstrated by investigating the electro-mechanical response to elongations of 1 mm, 2 mm and 3 mm. In the second project, a novel flexible capacitive pressure sensor was successfully developed for detecting applied pressure. The sensor was fabricated by creating PDMS based electrode channels that were filled with Eutectic Gallium-Indium (EGaIn) liquid metal. The master molds for the electrode channels were manufactured using conventional PCB technology. Then two separate PDMS layers were bonded together by corona discharge treatment, at room temperature and atmospheric pressure before the liquid metal is injected. The capability of the fabricated pressure sensor was demonstrated by investigating the capacitive based response of the device for varying applied pressures, ranging from 0.25 MPa to 1.1 MPa.

Download or read book Nanomaterials For Energy Conversion And Storage written by Dunwei Wang and published by World Scientific. This book was released on 2017-11-10 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of nanomaterials in energy conversion and storage represents an opportunity to improve the performance, density and ease of transportation in renewable resources. This book looks at the most recent research on the topic, with particular focus on artificial photosynthesis and lithium-ion batteries as the most promising technologies to date. Research on the broad subject of energy conversion and storage calls for expertise from a wide range of backgrounds, from the most fundamental perspectives of the key catalytic processes at the molecular level to device scale engineering and optimization. Although the nature of the processes dictates that electrochemistry is a primary characterization tool, due attention is given to advanced techniques such as synchrotron studies in operando. These studies look at the gap between the performance of current technology and what is needed for the future, for example how to improve on the lithium-ion battery and to go beyond its capabilities.Suitable for students and practitioners in the chemical, electrochemical, and environmental sciences, Nanomaterials for Energy Conversion and Storage provides the information needed to find scalable, economically viable and safe solutions for sustainable energy.

Download or read book Recent Advances in Mechanisms Transmissions and Applications written by Delun Wang and published by Springer Nature. This book was released on 2019-09-06 with total page 649 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gathering the proceedings of the conference MeTrApp 2019, this book covers topics such as mechanism and machinery design, parallel manipulators, robotics and mechatronics, control applications, mechanical transmissions, cam and gear mechanisms, and dynamics of machinery. MeTrApp 2019 provided researchers, scientists, industry experts, and graduate students from around the globe with a platform to share their cutting-edge work on mechanisms, transmissions, and their applications. The proceedings extend this platform to all researchers, scientists, industry experts, and students interested in these fields.

Download or read book Smart Sensor Systems written by Gerard Meijer and published by John Wiley & Sons. This book was released on 2014-04-02 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions from an internationally-renowned group of experts, this book uses a multidisciplinary approach to review recent developments in the field of smart sensor systems, covering important system and design aspects. It examines topics over the whole range of sensor technology from the theory and constraints of basic elements, physics and electronics, up to the level of application-orientated issues. Developed as a complementary volume to ‘Smart Sensor Systems’ (Wiley 2008), which introduces the basics of smart sensor systems, this volume focuses on emerging sensing technologies and applications, including: State-of-the-art techniques for designing smart sensors and smart sensor systems, including measurement techniques at system level, such as dynamic error correction, calibration, self-calibration and trimming. Circuit design for sensor systems, such as the design of precision instrumentation amplifiers. Impedance sensors, and the associated measurement techniques and electronics, that measure electrical characteristics to derive physical and biomedical parameters, such as blood viscosity or growth of micro-organisms. Complete sensor systems-on-a-chip, such as CMOS optical imagers and microarrays for DNA detection, and the associated circuit and micro-fabrication techniques. Vibratory gyroscopes and the associated electronics, employing mechanical and electrical signal amplification to enable low-power angular-rate sensing. Implantable smart sensors for neural interfacing in bio-medical applications. Smart combinations of energy harvesters and energy-storage devices for autonomous wireless sensors. Smart Sensor Systems: Emerging Technologies and Applications will greatly benefit final-year undergraduate and postgraduate students in the areas of electrical, mechanical and chemical engineering, and physics. Professional engineers and researchers in the microelectronics industry, including microsystem developers, will also find this a thorough and useful volume.

Download or read book Flexible and Wearable Sensors written by Ram K. Gupta and published by CRC Press. This book was released on 2023-03-21 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: With rapid technological developments and lifestyle advancements, electronic sensors are being seamlessly integrated into many devices. This comprehensive handbook explores current, state-of-the-art developments in flexible and wearable sensor technology and its future challenges. Numerous recent efforts have improved the sensing capability and functionality of flexible and wearable sensors. However, there are still many challenges in making them super-smart by incorporating features such as self-power, self-healing, and multifunctionality. These features can be developed with the use of multifunctional nanostructured materials, unique architectural designs, and other advanced technologies. This book provides details about the recent advancements, materials, and technologies used for flexible and wearable sensors. Its wide range of topics addresses the fundamentals of flexible and wearable sensors, their working principles, and their advanced applications. This handbook provides new directions to scientists, researchers, and students to better understand the principles, technologies, and applications of sensors in healthcare, energy, and the environment.

Download or read book Development of Smart Wearable Sensory Systems on Flexible and Fabric Platforms for Health Monitoring Applications written by Simin Masihi and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wearable sensing technology has recently received an increased attention in both research and commercialization phases and has moved from a vision of science fiction to reality with a wide variety of applications. This incredible growth can be attributed to several factors, such as affordability and ergonomics provided by advances in flexible electronics. The other factors that realized wearable sensing technology include a critical need for more accessible health care services experienced during the recent COVID pandemic, integration to the Internet of Things (IoT), and a growing consumer desire for health awareness. This dissertation presents the fulfillment of three main projects and focuses on the development of various sensors on flexible platforms such as fabrics and plastics using Flexible Hybrid Electronics (FHE) technology to facilitate healthcare monitoring. In the first project, highly sensitive fabric-based pressure sensors were developed for detecting and decreasing sport-related head injuries. Many athletes, from football players to equestrians, rely on helmets (headgear) to protect their heads from impacts or falls. However, a loose or improperly fitted helmet could leave them vulnerable to traumatic brain injuries (TBIs), a leading cause of death or disability in the U.S. To monitor the helmet fit, a highly sensitive pressure sensor cap has been developed that can map pressure in real-time. When worn under a helmet, the cap could help reveal whether the helmet is a perfect fit. These pressure sensors rely on a capacitive mechanism and were fabricated by placing a novel porous polydimethylsiloxane (PDMS) layer between two fabric electrodes. The porous PDMS dielectric layer was fabricated by introducing nitric acid (HNO3) into a mixture of PDMS and sodium bicarbonate (NaHCO3, known as baking soda) to facilitate the liberation of carbon dioxide (CO2) gas, which induces the creation of porous microstructures within the PDMS dielectric layer. This porous PDMS material experiences large deformation, when compared to a solid PDMS layer, and thus increases the capacitance change, making the pressure sensors highly sensitive. In the second project, a flexible wireless electrocardiogram (ECG) device was developed on a fabric platform for electrocardiographic examinations without the use of skin treatments or adhesive gels. In practice, this ECG device facilitates more frequent “at-home” screening of patients who are at risk of cardiovascular disease. The developed device consists of dry electrodes that were fabricated by printing a conductive carbon-PDMS composite on stretchable thermoplastic polyurethane (TPU) laminated on fabric and a flexible readout module that can be directly integrated into clothing. Even though dry electrodes do not use adhesive gel, they perform very similar to conventional wet electrodes and even better in terms of signal to noise ratio. Therefore, they are easier to apply and can potentially replace the wet electrodes. In the third project, a flexible tunable and compact microstrip antenna with a conformal structure was developed for wearable applications. The antenna was fabricated by sandwiching a flexible polyimide substrate between two flexible copper tapes, forming the radiating patch and ground plane. Laser machining was introduced as a facile and fast method for the antenna fabrication. To meet the crucial need of miniaturization of devices in wearables, the antenna was compacted from 2.4 GHz to 900 MHz frequency, without increasing the size of the antenna. Mechanical characterization of the flexible antenna demonstrated the feasibility of the fabricated antenna to sense various bending and stretching stresses.

Download or read book Flexible pressure and temperature sensors towards e skin material mechanism structure and fabrication written by Shengrui Tian and published by OAE Publishing Inc.. This book was released on 2023-08-07 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electronic skin (E-skin) has gained significant attention due to its potential applications in the Internet of Things (IoT), artificial intelligence (AI), and flexible multi-sensing systems. Mimicking human skin, e-skin sensing devices can be employed in various scenarios. Among the most important sensing elements for tactile e-skin sensors are pressure and temperature sensors, which have increasingly garnered research interest over the past few decades. However, the design and fabrication of advanced pressure and temperature sensors can be challenging owing to complications such as signal interference, complex mechanism integration, and structural design issues. This review provides an overview of flexible pressure and temperature sensors used in e-skin, covering four main perspectives: material selection, mechanism integration, structural design, and manufacturing methods. The materials of different elements in the entire sensing system are comprehensively discussed, along with single and compound mechanisms of pressure and temperature sensing. Pressure and temperature sensors are divided into two types based on their electric output signals, which are exemplified in detail. The manufacturing methods used to fabricate these sensors, including printing methods, are outlined. Lastly, a summary of the future challenges faced by flexible pressure and temperature sensors used in e-skin is presented.

Download or read book Flexible and Wearable Electronics for Smart Clothing written by Gang Wang and published by John Wiley & Sons. This book was released on 2020-02-24 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides the state-of-the-art on wearable technology for smart clothing The book gives a coherent overview of recent development on flexible electronics for smart clothing with emphasis on wearability and durability of the materials and devices. It offers detailed information on the basic functional components of the flexible and wearable electronics including sensing, systems-on-a-chip, interacting, and energy, as well as the integrating and connecting of electronics into textile form. It also provides insights into the compatibility and integration of functional materials, electronics, and the clothing technology. Flexible and Wearable Electronics for Smart Clothing offers comprehensive coverage of the technology in four parts. The first part discusses wearable organic nano-sensors, stimuli-responsive electronic skins, and flexible thermoelectrics and thermoelectric textiles. The next part examines textile triboelectric nanogenerators for energy harvesting, flexible and wearable solar cells and supercapacitors, and flexible and wearable lithium-ion batteries. Thermal and humid management for next-generation textiles, functionalization of fiber materials for washable smart wearable textiles, and flexible microfluidics for wearable electronics are covered in the next section. The last part introduces readers to piezoelectric materials and devices based flexible bio-integrated electronics, printed electronics for smart clothes, and the materials and processes for stretchable and wearable e-textile devices. -Presents the most recent developments in wearable technology such as wearable nanosensors, logic circuit, artificial intelligence, energy harvesting, and wireless communication -Covers the flexible and wearable electronics as essential functional components for smart clothing from sensing, systems-on-a-chip, interacting, energy to the integrating and connecting of electronics -Of high interest to a large and interdisciplinary target group, including materials scientists, textile chemists, and electronic engineers in academia and industry Flexible and Wearable Electronics for Smart Clothing will appeal to materials scientists, textile industry professionals, textile engineers, electronics engineers, and sensor developers.

Download or read book Microfluidics written by Yu Song and published by John Wiley & Sons. This book was released on 2018-05-07 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book offering a global overview of fundamental microfluidics and the wide range of possible applications, for example, in chemistry, biology, and biomedical science. As such, it summarizes recent progress in microfluidics, including its origin and development, the theoretical fundamentals, and fabrication techniques for microfluidic devices. The book also comprehensively covers the fluid mechanics, physics and chemistry as well as applications in such different fields as detection and synthesis of inorganic and organic materials. A useful reference for non-specialists and a basic guideline for research scientists and technicians already active in this field or intending to work in microfluidics.

Download or read book Functional Biopolymers written by Vijay Kumar Thakur and published by Springer. This book was released on 2018-08-25 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the synthesis, processing and application of selected functional biopolymers as new advanced materials. It reviews theoretical advances as well as experimental results, opening new avenues for researchers in the field of polymers and sustainable materials. The book covers various aspects, including the structural analysis of functional biopolymers based materials; functional biopolymer blends; films, fibers, foams, composites and different advanced applications. A special emphasis is on cellulose-based functional polymers, but other types of functional biopolymers (e.g. from chitosan, starch, or plant oils) are also described.

Download or read book Development of Fully Printed and Flexible Strain Pressure and Electrochemical Sensors written by Dinesh Maddipatla and published by . This book was released on 2016 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, considerable research has been put into the development of printed electronics (PE) as well as the best ways to effectively and efficiently print electronic devices on flexible substrates. This thesis focuses majorly on the design and fabrication of novel flexible sensors using conventional printing processes. Initially, a flexible printed strain gauge was fabricated successfully on a flexible paper substrate using flexography printing process. Silver (Ag) ink was printed on the paper substrate as metallization layer. The performance of the printed device was investigated by subjecting the strain gauge to a 3-point bend test, with a displacement of 1 mm, 2 mm and 3 mm at 3 Hz operating frequency. The electro-mechanical response of the fabricated strain gauge, as a function of electrical resistance revealed that the sensor has a longer functional life for smaller displacements which is especially advantageous for structural asset monitoring applications. Then, a fully flexible carbon nanotube (CNT) capacitive pressure sensor was developed for the detection of varying applied pressures. The sensor was successfully fabricated using the screen printing technique. Polydimethylsiloxane (PDMS) was used as a dielectric layer and it was prepared using a PDMS pre-polymer and a curing agent mixed in a 10:1 ratio. The electrode design was directly screen printed using conductive CNT ink onto the PDMS dielectric layer. The capacitive response of the printed sensor for varying applied pressures demonstrated the feasibility of employing CNT based electrodes and PDMS dielectric layer for the development of an efficient, flexible and cost effective pressure sensors in sports, military, automotive and biomedical applications. Finally, a novel printed impedance based electrochemical sensor has been successfully developed on a paper substrate for the detection of various bio/chemicals. This flexible analytical device was fabricated by screen printing a two electrode sensor configuration on a wax-printed chromatography paper substrate. Ag ink was used for screen printing the working and circular electrodes. The electrical impedance spectroscopy (EIS) based response of the fabricated electrochemical sensor revealed the capability of the sensor to distinguish among varying levels (pico, nano, micro and milli) of potassium chloride (KCl) and glucose (C6H12O6) concentrations as well as the potential of employing paper substrate based electrochemical sensors for bio/chemical sensing applications.

Download or read book Robotic Tactile Sensing written by Ravinder S. Dahiya and published by Springer Science & Business Media. This book was released on 2012-07-29 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future robots are expected to work closely and interact safely with real-world objects and humans alike. Sense of touch is important in this context, as it helps estimate properties such as shape, texture, hardness, material type and many more; provides action related information, such as slip detection; and helps carrying out actions such as rolling an object between fingers without dropping it. This book presents an in-depth description of the solutions available for gathering tactile data, obtaining aforementioned tactile information from the data and effectively using the same in various robotic tasks. The efforts during last four decades or so have yielded a wide spectrum of tactile sensing technologies and engineered solutions for both intrinsic and extrinsic touch sensors. Nowadays, new materials and structures are being explored for obtaining robotic skin with physical features like bendable, conformable, and stretchable. Such features are important for covering various body parts of robots or 3D surfaces. Nonetheless, there exist many more hardware, software and application related issues that must be considered to make tactile sensing an effective component of future robotic platforms. This book presents an in-depth analysis of various system related issues and presents the trade-offs one may face while developing an effective tactile sensing system. For this purpose, human touch sensing has also been explored. The design hints coming out of the investigations into human sense of touch can be useful in improving the effectiveness of tactile sensory modality in robotics and other machines. Better integration of tactile sensors on a robot’s body is prerequisite for the effective utilization of tactile data. The concept of semiconductor devices based sensors is an interesting one, as it allows compact and fast tactile sensing systems with capabilities such as human-like spatio-temporal resolution. This book presents a comprehensive description of semiconductor devices based tactile sensing. In particular, novel Piezo Oxide Semiconductor Field Effect Transistor (POSFET) based approach for high resolution tactile sensing has been discussed in detail. Finally, the extension of semiconductors devices based sensors concept to large and flexile areas has been discussed for obtaining robotic or electronic skin. With its multidisciplinary scope, this book is suitable for graduate students and researchers coming from diverse areas such robotics (bio-robots, humanoids, rehabilitation etc.), applied materials, humans touch sensing, electronics, microsystems, and instrumentation. To better explain the concepts the text is supported by large number of figures.

Download or read book Semiconductor Gas Sensors written by Raivo Jaaniso and published by Woodhead Publishing. This book was released on 2019-09-24 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiconductor Gas Sensors, Second Edition, summarizes recent research on basic principles, new materials and emerging technologies in this essential field. Chapters cover the foundation of the underlying principles and sensing mechanisms of gas sensors, include expanded content on gas sensing characteristics, such as response, sensitivity and cross-sensitivity, present an overview of the nanomaterials utilized for gas sensing, and review the latest applications for semiconductor gas sensors, including environmental monitoring, indoor monitoring, medical applications, CMOS integration and chemical warfare agents. This second edition has been completely updated, thus ensuring it reflects current literature and the latest materials systems and applications. Includes an overview of key applications, with new chapters on indoor monitoring and medical applications Reviews developments in gas sensors and sensing methods, including an expanded section on gas sensor theory Discusses the use of nanomaterials in gas sensing, with new chapters on single-layer graphene sensors, graphene oxide sensors, printed sensors, and much more

Download or read book Advances in Graphic Communication Printing and Packaging Technology and Materials written by Pengfei Zhao and published by Springer Nature. This book was released on 2021-05-25 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes a selection of reviewed papers presented at the 11th China Academic Conference on Printing and Packaging, held on November 26–29, 2020, Guangzhou, China. The conference is jointly organized by China Academy of Printing Technology and South China University of Technology. With 10 keynote talks and 200 presented papers on graphic communication and packaging technologies, the conference attracted more than 300 scientists. The proceedings cover the recent findings in color science and technology, image processing technology, digital media technology, mechanical and electronic engineering and numerical control, materials and detection, digital process management technology in printing and packaging, and other technologies. As such, the book is of interest to university researchers, R&D engineers and graduate students in the field of graphic arts, packaging, color science, image science, material science, computer science, digital media, network technology and smart manufacturing technology.