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Development and preliminary characterization on the performance of a micro-bubble generator using carbon nanotubes (CNTs) as heating elements are presented. Dielectrophoretic force was used to align CNTs between fabricated micro-electrodes. The contacts between the CNTs and electrodes were fixed by patterned SiO2 thin film. Localized high temperature due to Joule-heating generated by an AC current...
In this study we predict the frequency modulation atomic force microscopy (FM-AFM) subatomic frequency shift images of a Si (001) surface using empirical potential molecular dynamic methods. We model carbon single-wall nanotube caped tip and Si (001) surface to investigate the tip-surface interaction. The simulation shows that the FM-AFM imaging force mainly comes from C-Si/C-C chemical covalent bonding...
Functionalized quantum dots have been successfully attached to multi-walled carbon nanotubes over carbodiimide-assisted coupling. Characterization in a transmission electron microscope shows the quantum dots are attached mainly at the opened tips and defect sites on the side-walls of nanotubes, suggesting the covalent nature of the bonding and high selectivity to chemically reactive sites. Due to...
We have demonstrated multi-walled carbon nanotube (MWCNTs) based sensors, which are capable of detecting alcohol vapor with ultra-low power. We fabricated the Si-substrate sensors using an AC electrophoretic technique so as to form bundled MWCNTs sensing elements between Au microelectrodes. The I-V measurement illustrates that we can activate the sensors at the Ohmic region of the sensors (at 10 muA),...
In this paper, novel top branched carbon nanotube (TBCNT) were discovered by the scanning electron microscopy (SEM) and transmission electron microscopy (TEM). This new kind TBCNT was grown directly on tungsten wire by pyrolysis of FePc. At 1123 K FePc can be decompounded into C, Fe and other elements, the deposition site of C atom was calculated when FePc be decompound in test, and the growth of...
Self-welded double-wall and multi-wall carbon nanotube (DWCNT and MWCNT) bridges were used for the first time as nano-scale piezoresistors to monitor vibration and deformation of silicon cantilever beams. The CNTs were grown using low-pressure metal-catalyzed chemical vapor deposition technique between silicon-on-insulator posts situated over cantilever beams such that when the beams were deformed,...
Microwave absorbing characteristics of composites filled with carbon nanotubes (CNTs), including the laminar composite with different thickness, is investigated in detail. The filler used for the absorbent is CNTs and the matrix is polyester. The absorbing curves display obvious absorbability, which measuring frequency-band extend from 8~18 GHz. But comparative experiments show that the absorbing...
In this paper, we investigated the self-cleaning effects of biomimetic dry adhesives, which are made of e-beam photoresist and carbon nanotubes (CNT). Although the photoresist and the CNT are both intrinsically hydrophilic, superhydrophobic behavior was obtained when they were patterned or synthesized into nano-fibrils. The intrinsic hydrophilicity indicates that these materials possess sufficient...
Carbon nanotube (CNT) is found to be an amazing material for nanoelectronics due to its unique properties. It provides the possibility of miniaturizing the traditional electronic elements. Recently, people have been focusing on exploring its applications on optoelectronics because CNT is a direct bandgap material and its bandgap is inversely related to its diameter. Thus, it is ease for photon adsorption...
Various sensing characteristic of carbon nanotube synthesized by low press chemical vapor deposit (LPCVD) method have been studied. The composite sensing film of silicon dioxide and multi-wall nanotubes (SiO 2-MWNTs) is sensitive to methane. The various characteristic such as sensitivity, repeatability, reliability and cross-sensitivity of SiO2-MWNTs composite film gas sensor have been studied. Having...
We report on the development of new elastomers and processes that utilize polymers such as PDMS, FSR (force sensitive resistor) polymer, MWCNT, and polyurethane to realize bioinspired sensors such as artificial haircells. In nature, haircell sensors are used by fish to sense flow, by spiders to sense vibration, and by some vertebrates for hearing and acoustics. An artificial haircell sensor is designed...
Carbon nanotube (CNT) is a useful material for gas sensing applications because of its high surface to volume ratio structure. In this work, multi-wall CNTs are incorporated into tin oxide thin film by the means of powder mixing and electron beam evaporation and the enhancement of gas-sensing properties is presented. The CNTs were combined with SnO2 powder with varying concentration in the range of...
This paper will describe a practical procedure and a simple data analysis method for the evaluation of the carbonaceous impurities in the as-produced (AP) single-walled carbon nanotube (SWNT) samples. This procedure starts with dispersing an AP-SWNT sample in an aqueous surfactant by using a sonicator. Then the optical absorption spectrum of the suspension is measured in the visible and the near-infrared...
This paper focuses on nano-scale analysis of mechanical properties of polymer and carbon nanotubes (CNT) embedded MEMS devices using the probe tip of the atomic force microscope (AFM). The mechanical properties of surfaces of layered materials were investigated by using nanoindentation produced with tips of an AFM. Experiment results indicated the bending characteristics of the device and could also...
Near-field microwave probes were developed and used to image electromagnetic properties of materials with spatial resolutions only limited by the probe aperture size, signal-to-noise ratio and not by the Abbe barrier. The price of this "super" resolution is point-by-point scanning of the sample that makes it slow and requires additional mechanisms to control the probe-to-sample distance...
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