Download or read book Directed Assembly Techniques for Nano manufacturing of Scalable Single Walled Carbon Nanotube Based Devices written by Prashanth Makaram and published by . This book was released on 2009 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single Walled Carbon Nanotubes (SWNTs) are being considered building blocks for next generation electronics due to their unique electrical, mechanical and thermal properties. A number of SWNT based devices including scanning probes, field emitters, field effect transistors, biological and chemical sensors, and memory devices have been demonstrated. Despite successful demonstration of these single devices, the success of SWNT based nanoelectronics is hampered due to the lack of a successful nano-manufacturing method. Precise alignment and placement of SWNTs is necessary for successful integration of SWNTs into nanoelectronics. The work described in this thesis is focused on developing electric field assisted assembly techniques for precise placement and controlled orientation of SWNTs. In a first set of experiments we evaluate the use of micro/nano finger shaped metal electrodes to assemble SWNTs. Even though this assembly technique help in understanding the electrophoretic behavior of SWNTs, problems related with orientation, assembly at nanoscale and electrode degradation demanded evaluating alternative techniques. Nanotemplates that use trenches made in PMMA on a conductive substrate are utilized for the directed, controlled assembly of SWNTs This technique uses a combination of electrophoretic forces and fluidic forces to assemble and align the SWNTs. We were able to assemble SWNTs in trenches that are as small as 80 nm wide and 100,000 nm long over a 2.25 cm2 area in 30-90 seconds. Based on the experimental results and analysis a model is proposed to explain the assembly and alignment mechanism of SWNT s. The technique has been utilized to fabricated interconnects and field effect transistors to demonstrate the feasibility to make devices. Finally we introduce a novel room temperature assembly technique for fabricating a three dimensional single walled carbon nanotube platform. A top down lithographic approach is used to fabricate the platform while a bottom-up dielectrophoresis method is used to assemble the SWNTs in a 3D architecture. This is a scalable, high throughput and room temperature technique making it compatible with current CMOS technology. We demonstrate the ability to precisely control the density of SWNTs. A finite element model is used to simulate and study the behavior the SWNTs during assembly. We also demonstrate that these structures can be utilized directly as 3D interconnects. Finally, we show that the packaging of these devices, using a conformal pin-free parylene layer, provides a complete process flow for making SWNT based 3D nano-devices.

Download or read book Development of High rate Electro fluidic Directed Assembly of Nanoelements on Insulating Surfaces written by Asli Sirman and published by . This book was released on 2014 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Directed assembly of nanoelements has been used to fabricate devices for diverse applications including electronics, energy and materials. The challenge in using such techniques consists of developing highly scalable, high-rate assembly techniques for precisely placing nanoelements. Two promising examples are template-directed fluidic assembly and electric field induced assembly. In template-directed fluidic assembly, the substrate is vertically dipped into a nanoelement solution and slowly withdrawn creating a capillary force at the air-liquid interface. The withdrawal speed of the substrate needs to be slow to achieve the necessary nanoelement concentration near the template. On the other hand, electric field induced assembly techniques are very fast and robust. In this technique, two electrodes are utilized to create an electric field to direct nanoelements to the assembly region. Thus, assembly inherently results on conducting surfaces. We enhanced the previously described techniques and developed a new nanomanufacturing method called electro-fluidic directed assembly, which places nanoelements on insulating surfaces in a very short time. The electro-fluidic directed assembly is conducted on an insulating layer by having a thin conductive film underneath. The conductive layer serves to create an electrophoretic force on the suspended nanoelements. The applied electric field attracts charged nanoelements toward the template and quickly replenishes the concentration in the assembly region as a consequence fast pulling speeds results in higher assembly efficiencies. In this study, governing parameters and important process kinetics, such as applied voltage and pH of the solution, were studied to establish a repeatable and robust assembly technique. A generalized assembly efficiency graph was obtained for different pulling speeds. We were also able to examine monolayer and multilayer assemblies with different geometries down to 100 nm scale. We have demonstrated assembly of polystyrene latex (PSL) nanoparticles, copper nanoparticles, silica nanoparticles, quantum dots and single walled carbon nanotubes (CNT). Finally, a single wall carbon nanotube based NO2 gas sensor was fabricated. The overall significance of our results is twofold: first, the electro-fluidic assembly process is two orders of magnitude faster than the conventional fluidic assembly technique, and second, nanoelements are directly placed on the insulating layer unlike the electric field assembly technique. Our findings indicate that knowledge gained from this study could possibly aid in the understanding of high yield and repeatable assembly--leading to various nanoscale device applications.

Download or read book Electrophoretic Directed Assembly and Transfer of Single walled Carbon Nanotubes SWNTs for Electronics and Biomedical Applications written by Mehmet Cem Apaydin and published by . This book was released on 2014 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electronics industry is in need of new nanomaterials to integrate into various applications, such as integrated circuits, optoelectronics and sensor devices. Apart from conventional devices that are established previously with silicon and III-V semiconductors, the flexible electronics with novel molecular architectures is a new rising trend. The integration of these materials into the applications is needed in order to exceed the recent performance limits. This requires highly scalable, high-yield and high-rate micro/nano fabrication methods. Instead of the traditional top-down manufacturing approaches, novel non-traditional bottom-up processes are envisioned for the successful integration in the next decade. However, few realistic efforts have been made to successfully commercialize the applications above for the consumer availability by introducing novel bottom-up fabrication procedures. Single-walled carbon nanotubes (SWNTs) hold promise for various electronics applications by displaying significant fundamental physical characteristics. Fundamental research has matured to identify the capabilities of SWNTs, and it is believed that SWNTs pave the way to advance the contemporary applications in electronics industry by providing miniaturization and flexibility. However, suitable fabrication methods have to be developed to fully utilize SWNTs for commercialization and consumer availability. The manufacturing approaches introduced in this research aim to provide high-rate and low-cost methodologies that realize the applications over large area with high-yield and reliability. In this dissertation, electrophoretic directed assembly of SWNTs and various transfer methods are utilized to integrate the aligned thin-film SWNT networks into the applications, mainly in the field of flexible electronics. Electrophoretic directed assembly of SWNTs is a reliable method for having precise control over the location and alignment of SWNTs on device layouts. A parameter study is done to tune the thin-film assembly of aligned SWNT networks that are considered as the active layers of devices. Three different integration processes with material transfer are engineered to incorporate the high-density highly aligned thin-film SWNT networks from templates to devices. Each methodology aims to realize flexible microelectronics with transistor-based applications. It is demonstrated that such SWNT networks are integrable into the flexible electronics without altering the mainstream physical characteristics of SWNTs and devices by bringing the appropriate materials and methods together.

Download or read book Handbook of Nanoscience Engineering and Technology written by William A. Goddard III and published by CRC Press. This book was released on 2018-09-03 with total page 1075 pages. Available in PDF, EPUB and Kindle. Book excerpt: In his 1959 address, "There is Plenty of Room at the Bottom," Richard P. Feynman speculated about manipulating materials atom by atom and challenged the technical community "to find ways of manipulating and controlling things on a small scale." This visionary challenge has now become a reality, with recent advances enabling atomistic-level tailoring and control of materials. Exemplifying Feynman’s vision, Handbook of Nanoscience, Engineering, and Technology, Third Edition continues to explore innovative nanoscience, engineering, and technology areas. Along with updating all chapters, this third edition extends the coverage of emerging nano areas even further. Two entirely new sections on energy and biology cover nanomaterials for energy storage devices, photovoltaics, DNA devices and assembly, digital microfluidic lab-on-a-chip, and much more. This edition also includes new chapters on nanomagnet logic, quantum transport at the nanoscale, terahertz emission from Bloch oscillator systems, molecular logic, electronic optics in graphene, and electromagnetic metamaterials. With contributions from top scientists and researchers from around the globe, this color handbook presents a unified, up-to-date account of the most promising technologies and developments in the nano field. It sets the stage for the next revolution of nanoscale manufacturing—where scalable technologies are used to manufacture large numbers of devices with complex functionalities.

Download or read book Development of a Feedback Controlled Carbon Nanotube Based Nanoelectricomechanical Device written by Changhong Ke and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The fabrication of individual devices has been demonstrated by the means of the nanomanipulation of individual carbon nanotubes, together with MEMS microfabrication. Fabrication of massively parallel device array based on directed self-assembly approach is also discussed.

Download or read book Development of Advanced Nanomanufacturing written by Huifeng Li and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of nanoscience and nanotechnology requires rapid and robust nanomanufacturing processes to produce nanoscale materials, structures and devices. The dissertation aims to contribute to two major challenging and attractive topics in nanomanufacturing. Firstly, this research develops fabrication techniques for three dimensional (3D) structures and integrates them into functional devices and systems. Secondly, a novel process is proposed and studied for rapid and efficient manipulation of nanomaterials using a directed self-assembly process. The study begins with the development of nanoimprint lithography for nanopatterning and fabrication of 3D multilayer polymeric structures in the micro- and nano-scale, by optimizing the layer-transfer and transfer-bonding techniques. These techniques allow the integration of microfluidic and photonic systems in a single chip for achieving ultracompact lab-on-a-chip concept. To exemplify the integration capability, a monolithic fluorescence detection system is proposed and the approaches to design and fabricate the components, such as a tunable optical filter and optical antennas are addressed. The nanoimprint lithography can also be employed to prepare nanopatterned polymer structures as a template to guide the self-assembly process of nanomaterials, such as single-walled carbon nanotubes (SWNTs). By introducing the surface functionalization, electric field and ultrasonic agitation into the process, we develop a rapid and robust approach for effective placement and alignment of SWNTs. These nanomanufacturing processes are successfully developed and will provide a pathway to the full realization of the lab-on-a-chip concept and significantly contribute to the applications of nanomaterials.

Download or read book Directing Carbon Nanotubes and Graphene written by Brian R. Burg and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2011-07 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Device and sensor miniaturization has enabled extraordinary functionality and sensitivity enhancements over the last decades while considerably reducing fabrication costs and energy consumption. The traditional materials and process technologies used today will, however, ultimately run into fundamental limitations. Combining large-scale directed assembly methods with high-symmetry low-dimensional carbon nanomaterials is expected to contribute toward overcoming shortcomings of traditional process technologies and pave the way for commercially viable device nanofabrication. The purpose of this work is to demonstrate the guided dielectrophoretic integration of individual single-walled carbon nanotube- and graphene-based devices allowing parallel sensor assembly on the example of a piezoresistive pressure sensor. The ultimate goal is to fabricate ultra-small functional devices at high throughput and low costs, which require only minute operation power.

Download or read book Rahmenkonzept f r Einkaufsstandorte in der Landeshauptstadt Hannover written by and published by . This book was released on 1985 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physical Properties Of Carbon Nanotubes written by G Dresselhaus and published by World Scientific. This book was released on 1998-07-22 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an introductory textbook for graduate students and researchers from various fields of science who wish to learn about carbon nanotubes. The field is still at an early stage, and progress continues at a rapid rate. This book focuses on the basic principles behind the physical properties and gives the background necessary to understand the recent developments. Some useful computational source codes which generate coordinates for carbon nanotubes are also included in the appendix.

Download or read book Materials Nanoarchitectonics written by Katsuhiko Ariga and published by Elsevier. This book was released on 2023-12-07 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Nanoarchitectonics: From Integrated Molecular Systems to Advanced Devices provides the latest information on the design and molecular manipulation of self-organized hierarchically structured systems using tailor-made nanoscale materials as structural and functional units. The book is organized into three main sections that focus on molecular design of building blocks and hybrid materials, formation of nanostructures, and applications and devices. Bringing together emerging materials, synthetic aspects, nanostructure strategies, and applications, the book aims to support further progress, by offering different perspectives and a strong interdisciplinary approach to this rapidly growing area of innovation. This is an extremely valuable resource for researchers, advanced students, and scientists in industry, with an interest in nanoarchitectonics, nanostructures, and nanomaterials, or across the areas of nanotechnology, chemistry, surface science, polymer science, electrical engineering, physics, chemical engineering, and materials science. - Offers a nanoarchitectonic perspective on emerging fields, such as metal-organic frameworks, porous polymer materials, or biomimetic nanostructures - Discusses different approaches to utilizing "soft chemistry" as a source for hierarchically organized materials - Offers an interdisciplinary approach to the design and construction of integrated chemical nano systems - Discusses novel approaches towards the creation of complex multiscale architectures

Download or read book Controlled Assembly and Electronic Transport Studies of Solution Processed Carbon Nanotube Devices written by Paul Stokes and published by . This book was released on 2010 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developing techniques for the parallel fabrication of Complementary Metal Oxide Semiconductor (CMOS) compatible single walled carbon nanotube (SWNT) electronic devices is of great importance for nanoelectronic applications. In this thesis, solution processed SWNTs in combination with AC dielectrophoresis (DEP) were utilized to fabricate CMOS compatible SWNT field effect transistors (FETs) and single electron transistors (SETs) with high yield and their detailed electronic transport properties were studied. Solution processing of SWNTs is attractive not only for the high throughput and parallel manufacturing of SWNT devices but also due to the ease of processing at room temperature, and compatibility with various substrates. However, it is generally believed that solution processing introduces defects and can degrade electronic transport properties. The results presented in this dissertation show that devices assembled from stable solutions of SWNT can give rise to high quality FET devices at room temperature and relatively clean SET behavior at low temperature. This is a strong indication that there are no or few intrinsic defects in the SWNTs. The dissertation will also discuss the controlled fabrication of size tunable SWNT SET devices using a novel mechanical template approach which offers a route towards the parallel fabrication of room temperature SET devices. The approach is based on the formation of two tunnel barriers created in a SWNT a distance L apart by bending the SWNT at the edge of a local Al/Al2O3 bottom gate. The local gate tunes individual electrons one by one in the device and defines the size of the quantum dot though its width. By tuning both the back gate and local gate, it is possible to tune the transparency of tunnel barriers and the size of the quantum dot further. Detailed transport spectroscopy of these devices will be presented.

Download or read book Handbook of Visual Display Technology written by Janglin Chen and published by Springer. This book was released on 2012-01-23 with total page 2700 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook offers a comprehensive description of the science, technology, economic and human interface factors associated with the displays industry. With expert contributions from over 150 international display professionals and academic researchers, it covers all classes of display device and discusses established principles, emergent technologies, and particular areas of application.

Download or read book Wafer scale Alignment of Semiconducting Carbon Nanotubes from Solution written by Katherine Rose Jinkins and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon nanotubes are unique one-dimensional materials that exhibit extraordinary properties, including high stability, large elastic modulus, and exceptional charge and thermal transport, making them promising candidates for future mechanical, optical, and electronic devices. Electrical measurements of individual nanotubes have demonstrated room-temperature ballistic conductance and 3× higher current density than state-of-the-art Si field-effect transistors (FETs). While these results are exciting; to achieve the high on-current required for future carbon nanotube technologies to become viable, electronic devices must incorporate multiple nanotubes aligned in parallel. Alignment is especially critical to minimize sheet resistance and reduce charge carrier scattering in devices. However, the alignment of carbon nanotubes at intermediate packing densities in a scalable technique has plagued the electronics community for decades. In this work, we develop, explore, and elucidate three possible solutions to this long-standing challenge. First, we elucidate the mechanism of the floating evaporative self-assembly (FESA) technique, in which stripes of aligned nanotubes are deposited onto substrates by dosing a carbon nanotube ink at a water/substrate interface. We track the key interfaces directly at the substrate during FESA and show that the nanotube alignment occurs from the buried ink/water interface. We also demonstrate improved control over the bandwidth and band spacing of aligned carbon nanotubes and align nanotubes across a 2.5 × 2.5 cm2 substrate, an important step towards high-volume production. Ultimately, though, FESA cannot yield uniform, continuous films of aligned nanotubes over the wafer-scale, so other techniques are explored. We use the understanding gained toward the FESA mechanism to develop another alignment technique, tangential flow interfacial self-assembly (TaFISA), to fabricate uniform films of highly aligned carbon nanotubes for short channel FETs. In this process, we demonstrate that an ink/water interface can induce liquid crystal assembly of carbon nanotubes. Flowing this two-dimensional nematic assembly of nanotubes, globally aligns the nanotubes. By translating a substrate through this flowing ink/water interface, uniform films of highly aligned (within ±5.7°) nanotubes are deposited across 10 cm wide substrates. Due to the underlying lyotropic liquid crystal phenomena, the nanotube ordering improves with increasing concentration and decreasing temperature. The exceptional alignment leads to excellent FET performance with high on-state current density averaging 520 [mu]A [mu]m−1 at a V[DS] of -0.6 V. We also perform a more detailed investigation of experimental parameters that can affect the interfacial assembly, including nanotube ink solvent, substrate surface water contact angle, and modification of the water subphase. We also study the effect of shear on nanotube ink, without the ink/water interface as used in the FESA and TaFISA technique. We elucidate the effect of shear rate on nanotube alignment and find that the alignment increases with increasing shear rate following a power law dependence. We also demonstrate control over the nanotube packing density by tailoring the carbon nanotube ink concentration and ink volume. FETs are fabricated with their charge transport direction parallel and perpendicular to the alignment. The parallel FETs exhibit 7× faster charge carrier mobility of 101 cm2 V−1 s−1, while also simultaneously displaying high on/off ratio of 105. Deposition conditions are extensively optimized to enable alignment within a ± 27° window at nearly ideal packing density of 50 nanotubes [mu]m−1 over large-area 10 × 10 cm2 substrates. These quasi-aligned films are promising candidates for long-channel FETs (e.g., in displays, sensors, and flexible electronics), where some misalignment is necessary to allow charge percolation. We additionally report our work utilizing solution-based shear to fabricate ultrathin films of aligned cellulose nanocrystals. Cellulose nanocrystals (CNC) exhibit excellent mechanical and piezoelectric properties, making this material attractive for use in high-performance coatings. Toward this goal, we use confined shear-based alignment to fabricate ultrathin films of aligned CNC. The shear rate is varied from 19 to 19000 s−1 to improve the half-width at half-maximum of the spread in CNC alignment from 130 to 30°. The CNC solution volume and concentration are both used to independently control the film height.

Download or read book Handbook of Flexible and Stretchable Electronics written by Muhammad M. Hussain and published by CRC Press. This book was released on 2019-11-11 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flexibility and stretchability of electronics are crucial for next generation electronic devices that involve skin contact sensing and therapeutic actuation. This handbook provides a complete entrée to the field, from solid-state physics to materials chemistry, processing, devices, performance, and reliability testing, and integrated systems development. This work shows how microelectronics, signal processing, and wireless communications in the same circuitry are impacting electronics, healthcare, and energy applications. Key Features: • Covers the fundamentals to device applications, including solid-state and mechanics, chemistry, materials science, characterization techniques, and fabrication; • Offers a comprehensive base of knowledge for moving forward in this field, from foundational research to technology development; • Focuses on processing, characterization, and circuits and systems integration for device applications; • Addresses the basic physical properties and mechanics, as well as the nuts and bolts of reliability and performance analysis; • Discusses various technology applications, from printed electronics to logic and memory devices, sensors, actuators, displays, and energy storage and harvesting. This handbook will serve as the one-stop knowledge base for readership who are interested in flexible and stretchable electronics.

Download or read book Carbon Nanotube Electronics written by Ali Javey and published by Springer Science & Business Media. This book was released on 2009-04-21 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a complete overview of the field of carbon nanotube electronics. It covers materials and physical properties, synthesis and fabrication processes, devices and circuits, modeling, and finally novel applications of nanotube-based electronics. The book introduces fundamental device physics and circuit concepts of 1-D electronics. At the same time it provides specific examples of the state-of-the-art nanotube devices.

Download or read book Comprehensive Nanoscience and Nanotechnology written by and published by Academic Press. This book was released on 2019-01-02 with total page 1881 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Nanoscience and Technology, Second Edition, Five Volume Set allows researchers to navigate a very diverse, interdisciplinary and rapidly-changing field with up-to-date, comprehensive and authoritative coverage of every aspect of modern nanoscience and nanotechnology. Presents new chapters on the latest developments in the field Covers topics not discussed to this degree of detail in other works, such as biological devices and applications of nanotechnology Compiled and written by top international authorities in the field

Download or read book Nanotechnology Research Directions IWGN Workshop Report written by R.S. Williams and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: energy production, environmental management, transportation, communication, computation, and education. As the twenty-first century unfolds, nanotechnology's impact on the health, wealth, and security of the world's people is expected to be at least as significant as the combined influences in this century of antibiotics, the integrated circuit, and human-made polymers. Dr. Neal Lane, Advisor to the President for Science and Technology and former National Science Foundation (NSF) director, stated at a Congressional hearing in April 1998, "If I were asked for an area of science and engineering that will most likely produce the breakthroughs of tomorrow, I would point to nanoscale science and engineering. " Recognizing this potential, the White House Office of Science and Technology Policy (OSTP) and the Office of Management and Budget (OMB) have issued a joint memorandum to Federal agency heads that identifies nanotechnology as a research priority area for Federal investment in fiscal year 2001. This report charts "Nanotechnology Research Directions," as developed by the Interagency W orking Group on Nano Science, Engineering, and Technology (IWGN) of the National Science and Technology Council (NSTC). The report incorporates the views of leading experts from government, academia, and the private sector. It reflects the consensus reached at an IWGN-sponsored workshop held on January 27-29, 1999, and detailed in contributions submitted thereafter by members of the V. S. science and engineering community. (See Appendix A for a list of contributors.