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Low‐dimensional carbon materials, such as semiconducting carbon nanotubes (CNTs), conducting graphene, and their hybrids, are of great interest as promising candidates for flexible, foldable, and transparent electronics. However, the development of highly photoresponsive, flexible, and transparent optoelectronics still remains limited due to their low absorbance and fast recombination rate of photoexcited...
In article number 1700918, Jungwook Choi, Jongbaeg Kim, and co‐workers, develop a flexible/stretchable, fully transparent, and highly sensitive photodetector based on heterogeneously integrated porphyrin–single‐walled carbon nanotube (SWNT)–graphene. The all‐carbon optoelectronic device is constructed from monolayer graphene electrodes, and uniformly dispersed SWNT networks as semiconducting channels...
We report piezoresistive high-g three-axis accelerometer with a single proof mass suspended by thin eight beams. This eight-beam design allows load-sharing at high-g preventing structural breakage, as well as the symmetric arrangement of piezoresistors. The device chip size is 1.4 mm × 1.4 mm × 0.51 mm. Experimental results show that the sensitivity in X-, Y- and Z-axes are 0.2433, 0.1308 and 0.3068 mV/g/V...
We have developed a highly sensitive volatile organic compounds (VOCs) sensor using impact ionization induced by photoelectron. A novel mechanism of VOC detection, the screening effect of VOC cations, was proposed and experimentally verified for the first time. The fabricated sensor could detect various concentrations of toluene ranging from 500 down to 10 ppm under long wavelength of UV light (254...
We have demonstrated field-ionization gas sensor using suspended silver nanowires as electrodes. The tight gap of 1.5 μm between two facing sets of suspended in-plane nanowires on top of silicon microelectrodes, as well as the sharp protrusion of nanowires, allows the generation of high and non-uniform electric field. This produces field emission of electrons that result in ionization of gas molecules...
A novel accelerometer based on electrical contact resistance change between two sets of carbon nanotubes (CNTs) is presented. After the micro structures are fabricated by silicon bulk micromachining, the CNTs are synthesized from each of the facing surfaces of proof-mass and fixed electrode. When the motion of the proof-mass is generated from incoming acceleration, effective contact area between two...
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