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Carbon nanotube sensors offer sensitivity and compactness, and provide a versatile chemical platform for ambient monitoring of environmental pollutants such as ozone, ammonia and volatile organic compounds, known to cause acute respiratory health problems (e.g., exacerbations of asthma and COPD). The advances in electronics and the feasibility to interface complex sensor materials with low-resistance...
This paper gives a general overview on the methods to reduce interconnect resistance and capacitance in a standard CMOS technology followed by a discussion on the physical constraints that dictate the minimum achievable loading. A newly demonstrated method that uses carbon-nanotube to assist the formation of vertically aligned porous structure is studied. The method was shown to be able to reduce...
We propose a theoretical study on dual-frequency conformai antenna made by carbon nanotubes (CNTs) which is suitable to be printed on commercially available paper substrate. According to the simulation result, it is found that the radius of the conformal cylindrical surface and the conductivity of CNTs contribute little to the antenna performance. By further integrated onto the textile substrate,...
Carbon nanomaterials are emerging as popular platforms for the development of advanced sensor technologies. This paper reports fabrication, characterization, and testing of carbon nanomaterial based sensors for astrobiology exploration. Development of nanostructured sensor instruments and associated sensor electronics are designed to implement a prototype sensor instrument in “lab-in-a-teacup” platform...
Recently, we presented a multiscale model of field emission (FE) from carbon nanotube fibers (CBFs) taking into account Joule heating within the fiber and radiative cooling and the Nottingham effect at the tip of the individual carbon nanotubes in the array located at the fiber tip [1]. The model was used to predicts the fraction of carbon nanotubes (CNTs) being destroyed as a function of the applied...
All-carbon-nanotube thin-film transistors (ACNT-TFTs) are proposed and fabricated on a transparent glass substrate by a facile solution-processed method, with 95% enriched semiconducting single-walled carbon nanotubes (SWCNTs) serving as channel materials and mixed SWCNTs as source/drain/gate electrodes. The device demonstrates excellent electronic properties with an on/off current ratio over 105,...
The superb advantages of carbon nanotubes (CNTs) cannot be exhibited completely by devices using random CNT networks as channel materials due to the large tube-to-tube contact resistance. Traditional Langmuir-Blodgett (LB) method with direct compression and dipping has little performance improvement for films due to defects of CNT orientation. Here an improved LB method with gradually increased surface...
Developing novel security devices using nanotechnology has emerged as a promising new area since they offer higher reliability, small form factor, and anti-tampering features. Single-walled carbon nanotube (CNT) is promising to replace silicon as the future transistor channel material due to its superb electrical properties and intrinsic ultrathin body. However, several imperfections of this nanomaterial...
Low-threshold field emission is the intrinsic property for nanocarbon materials. Emission characteristics of planar field cathodes with carbon nanotubes (CNT) deposited from solution to Si, Al, Pd substrates were studied. The field emission threshold value for horizontally aligned CNT was found as low as 4 V/μm. However, the field enhancement in these samples is negligible (<10). We propose to...
Multiwall Carbon Nanotube (MWCNT) films were spincoated on Silicon (Si) substrate. The effect of 0.1% and 0.2% solutions of MWCNT incorporation with methanol were investigated. The spincoated MWCNT films were characterized by SEM and UV-VIS-IR spectroscopy. In SEM micrographs, changes were observed in the spincoated films compared to pure Si substrates. Existence of carbon nanowire was also observed...
Here, we reported a valid approach to sort largediameter semiconducting single-walled carbon nanotubes (sc- SWCNTs) from commercial SWCNTs using new organic conjugated compounds and achieved more than 10 highperformance printable sc-SWCNTs inks. Print p-type and n-type TFT arrays and CMOS inverters based on sorted sc-SWCNTs were obtained on rigid and flexible substrates. Printed TFTs exhibited low...
Highly sensitive two-dimensional strain sensor, which consists of area-arrayed fine bundles of multi-walled carbon nanotubes (MWCNTs), has been developed by applying MEMS technology. Area-arrayed MWCNT bundles were grown on a substrate by CVD technique. When a compressive load was applied to the bundle, the electrical resistance of the bundle increased monotonically due to the change of the electronic...
We report the perovskite:SWNTs solar cells fabricated using solvent-solvent extraction (SSE) method at room temperature. Small quantities of Single-walled carbon nanotubes (SWNTs) are incorporated into perovskite Methylammonium lead halide (CH3NH3PbI3) layer, and enhance the power conversion efficiency (PCE) of the perovskite solar cell from 8.5% to 10.6%. SWNTs act as hole transport channels boosting...
In this work, a comparison between the electro-optical characteristics of CNT random networks obtained through inkjet printing and spray-deposition on flexible substrates is presented. Transmittance values are similar in both fabrication techniques; however, the sheet resistance of the inkjetted layers diverges significantly with respect to the reference spray-deposited thin film. To overcome this...
Fully transparent solution-processed carbon nanotube thin film transistors (CNT-TFTs) on flexible substrate are proposed and fabricated by a facile and low-cost process. By using 95%-semiconducting enriched carbon nanotubes as channel and transparent indium tin oxide as gate, source and drain electrodes, CNT-TFTs with a high on/off current ratio of 2.68×106, a low threshold voltage of 0.38 V, a steep...
A homogeneous film of acid functionalized Carbon Nanotubes was deposited on the paper substrate using Langmuir-Blodgett technique. The palladium nanoparticles were dropped on the nanotubes network afterword for device enhancement. The sensitivity of the device towards hydrogen gas was tested at three temperatures; room temperature, 200 °C and 300 °C in atmospheric conditions. The results show that...
Evolution-in-Materio (EIM) is a method of using artificial evolution to exploit physical properties of materials for computation. It has previously been successfully used to evolve a multitude of different computational devices implemented in physical materials. One of the main problems has been the stability of solutions due to physical changes in the substrate materials, e.g. topological or electrical,...
This paper presents a cost-effective method to transfer vertically aligned carbon nanotubes (VA-CNTs) with Poly(dimethylsiloxane) (PDMS). Here, in this process, we take the advantage of PDMS solution as the transfer medium, meanwhile utilize the good wetting of this solution on another cured PDMS film to realize efficient transfer. The SEM images of transferred CNTs were taken to characterize the...
A method of screen printing carbon nanotubes (CNTs) in a dielectric binder to produce low-cost, large area field emission electron sources is presented. Imaging under the scanning electron microscope (SEM) shows the nanotubes forming dense clusters on the substrate surface with protruding CNTs in random orientations. The printed device gives an emission current of 45 mAcm−2 at an applied field of...
Determination of the annealing condition has always been critical and challenging for performance improvement of the carbon-based devices. In this paper, rapid thermal annealing (RTA) in hydrogen followed by rapid cooling down with a double-thermal-region movable furnace for carbon nanotube thin film transistors (CNT-TFTs) has been proved to be an effective method to improve device performance. After...
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