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Structured and vertically aligned carbon nanotubes (CNTs) are investigated for their applicability as strain gauges. The CNTs are grown onto an oxidized Si substrate, passivated by a polymer and transferred to a flexible film. This sensor material has a high gauge factor up to 11.5 but also a negative temperature dependence of resistance (TCR with αCNT = -500 ppm/K). For TCR compensation,...
In this paper, photon detectors based on horizontally aligned and network single-walled carbon nanotubes (SWNTs) are systematically investigated and compared carefully. The photoresponse of the aligned device is approximately 4 times as large as the network device. At room temperature, the photoresponse of the network device increased in air compared to that in vacuum, while the aligned device behaved...
Analytical models for the transparency and sheet resistance of the SWNT thin film are developed. The transparency to sheet resistance ratio is investigated for varying concentration, length and orientation angle of carbon nanotubes.
The detection and analysis of dissolved gases in oil is an important means to determine the early latent faults of oil-immersed power transformer. A dissolved gases in oil detection method is presented based on carbon nanotubes sensor. A kind of MWNTs (Multi-wall carbon nanotubes) gas sensor modified by mixed acid was developed based on printed circuit board to detect dissolved gases in oil. The electrical...
Supercapacitors, also known as electrical double layer capacitors, are promising candidates to meet the increasing power demands upon energy storage systems. They have an important role in complementing or replacing batteries in the energy storage field, possessing advantages such as high power density, rapid charge/discharge (few seconds), >100 000 cycle life, and intrinsic safety (they contain...
This paper presents direct growth approach for production of graphene and carbon nanotubes in an on-chip manner towards integrated devices. Vertically aligned arrays of carbon nanotubes and edge-oriented graphene are synthesized by microwave plasma-enhanced chemical vapor deposition using methane and hydrogen as precursors. Cyclic voltammetry (CV) and electrochemical energy impedance measurements...
Based on a model with singular attractive potential of equidistant conductive cylinders, we illustrate an approach to calculate the electron spectrum of metallic multiwall carbon nanotubes (MW CNT) with an arbitrary number of coaxial layers. We compute the number of electrically active channels, Nch, in the ideal case when all MW CNT shells are contacted to the electrodes, starting from the one-electron...
A sliding probe technique has been developed for the in situ electrical property characterization of individual nanostructures inside a transmission electron microscope (TEM) using a nanomanipulator. Experimental investigation into the transport measurement of copper-filled carbon nanotubes, carbide nanowires, and carbon microfiber has shown the effectiveness of this method. Comparing with conventional...
Signal-to-Noise Ratio (SNR) is a very essential parameter in determining a sensor's performance and ultimate resolution limit. For conductance-based CNTs chemical sensors, how to increase the response and suppress the noise is a critical issue in optimizing the sensor performance. In this paper, we discuss our experiments performed on conductance-based CNTs sensors, which were fabricated by DEP manipulation,...
This paper presents an in-depth electrical characterization of contact resistance between metal and vertically aligned carbon nanotubes (CNTs) grown under various conditions. Following the bottom-up approach of interconnect fabrication processes in the nanoelectronics industry, a via test structure to extract the contact resistance is designed and fabricated. The contact resistance is extracted by...
The electrical performances of nano-interconnects are affected by temperature and size, which may seriously limit the current density and the reliability. This paper introduces such effects in the modelling of the electrical resistance of nano-interconnects, either made by copper and carbon-nanotubes. A simple and accurate semi-analytical model is proposed to describe the impact of size and temperature...
The areas of nanoscience and nanoengineering have been developing very fast; a large range of nanoscale materials has been studied in view of various practical applications. Much work is performed in the area of innovating coatings. Such films require specific properties such as proper conduction and mechanical ones. These properties can be studied by conductive probe AFM (CP-AFM) techniques. These...
A new remote strain measurement method has been developed by applying the highly sensitive change of electronic conductivity of CNTs. It is reported that most multi-walled carbon nanotubes (MWCNTs) show metallic conductivity and they are rather cheap comparing with single-walled carbon nanotubes (SWCNTs). It was found by atmic scale analysis that the electric conductivity of (MWCNTs) of changes significantly...
A 4Mbit nonvolatile memory with a Carbon Nanotube (CNT) storage element has been manufactured in a 0.25 μm CMOS process at a production fab. The CNT storage element is integrated in BEOL, requires minimal additional processing steps, and only a single additional mask. The memory can be RESET in 50 nanoseconds and SET in 500 nanoseconds. Demonstrated read access time of the development vehicle is 50...
A 4 Mbit nonvolatile memory with a Carbon Nanotube (CNT) storage element has been manufactured in a 0.25 μm CMOS process at a production fab. The CNT storage element is integrated in BEOL, requires minimal additional processing steps, and only a single additional mask. The memory can be RESET in 50 nanoseconds and SET in 500 nanoseconds. Demonstrated read access time of the development vehicle is...
A carbon nanotube (CNT) half-wavelength resonator is designed and analyzed in this paper. The electrical characteristics of the resonator are predicted based on the equivalent circuit model of multi-walled CNT (MWCNT). The propagation behavior in the resonator is presented with the influence of MWCNT diameter and operating frequency taken into account. The Q-factors for different kinds of losses in...
This paper presents for the first time the design and comparison of wide bandwidth high performance CMOS and CNFET realization of dual-output second generation current conveyor (CCII±) at 32nm technology node. Until this date, almost all design efforts of CCII± have been directed towards micron range, and the designing aspects at nm range still needs to be explored. Voltage and Current bandwidths,...
To remove the bottleneck of the interconnect especially at semi-global and global level, performance evaluation of local, semi global, and global interconnect is presented in this paper based on carbon nanotube (CNT) interconnect bundle model. For the greater length of the wire, a methodology is presented to find the optimum insertion and size of buffer for CNT bundle interconnects. The performance...
This paper puts forward and discusses the prospects of carbon based nanomaterials (including carbon nanotubes and graphene nano-ribbons) for designing next generation low-power, low-loss and ultra energy-efficient “green” electronics targeted for computing as well as energy storage and conversion applications.
A fully CMOS integrated carbon nanotube (CNT) sensor array platform that consists of an 8×8 array of unitary CNT elements has been designed and fabricated. For digital conversion of the analog voltage of CNT sensor elements, a correlated double sampling (CDS) type Successive Approximation Register (SAR) Analog/Digital converter has been used. The chip has been applied to sense the DNA hybridization...
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