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This work presents the methodology to synthesize single-walled carbon nanotubes and place them directly on paper utilizing a micro chemical vapor deposition (μCVD) system. In contrast to conventional CNTs (carbon nanotubes) synthesis in high temperature furnaces, the technique of μCVD with localized heating provides the foundation for the direct growth of CNTs on paper. Experimentally, self-aligned...
We have successfully demonstrated the direct pick and place of CNT bundles from a CNT growth substrate to a working specimen for strain sensing applications. The whole assembly process can take as little as one minute by manual operation under a probe station. A strain sensor based on CNT bundles has been constructed by adding electrical contacts. Experimental results show 2.1% relative resistance...
Densely packed carbon nanotube (CNT) forest on silicon wafer has been fabricated by combining the process of mechanical press and liquid densification. Advantages from the densely packed CNT forest prototype devices include: (1) 16-fold volume reduction with the same amount of CNT forest as compared to the as-grown CNT forest; (2) preservations of aligned CNT organization and natural contacts to the...
A lithography-free microchannel fabrication process with controlled pattern is demonstrated via the combination of Near Field Electrospinning (NFES) and molding of polydimethysiloxane (PDMS). Electrospun polymer fibers (1–10µm in width, 0.5–4µm in height) were patterned onto a silicon substrate to serve as the template. Microfluidic devices with parallel and grid-pattern microchannels were created...
Characterizing interface states is a key task, and it typically takes seconds when conventional techniques, such as charge pumping (CP), are used. The stress-induced degradation can recover substantially during this time, and there is a need to improve the measurement speed. The central task of this work is to reduce the measurement time for interface states from seconds to microseconds to minimize...
The transition from embryo to adulthood involves a massive growth in the nervous system where axons in nerves extend and expand to accommodate to this growth. Applying mechanical forces to dorsal root ganglia neuronal cultures has previously shown that there is stimulation in axonal growth, gradually elongating the axon over a set period of time. In this research, the main focus is to study with live...
This work presents the development of a capacitive tactile and shear-stress sensing array which can be easily and reliably fabricated by using MEMS techniques and flexible printed circuit board (FPCB) technologies. The sensing array consists of two micromachined PDMS structures and an FPCB with sensing electrodes. Each shear sensing element comprises four capacitive sensing element arranged in 2??2...
The conventional chemical vapor deposition system has been miniaturized to the micro scale, leading to several potential advantages for the synthesis of nanostructures. First, minute heat capacity leads to fast temperature stabilization. Second, tiny chamber volume helps for rapid gas species exchanges. Third, small Reynolds number ensures laminar flow for better control of deposition sources. Forth,...
Planar micro supercapacitors utilizing vertically aligned carbon nanotube (CNT) forests with the design of interdigital electrodes have been demonstrated. Conductive substrates using Mo/Al/Fe metal stack shows best CNT forest synthesis results with high electrical conductivity and dense CNT structures. Prototype devices show measured specific capacitances about 1000 times higher than those with plain...
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