Zhou Tuo, Kropp Ethan, Chen Jingyuan, Kulinsky Lawrence
Department of Mechanical and Aerospace Engineering, University of California, Irvine, 5200 Engineering Hall, Irvine, CA 92627-2700, USA.
Department of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, HIT Campus G908, Shenzhen, Guangdong 518055, China.
Micromachines (Basel). 2020 Apr 1;11(4):371. doi: 10.3390/mi11040371.
Carbon Nanotube (CNT) agglomerates can be aligned along field lines between adjacent electrodes to form conductive bridges. This study discusses the step-wise process of dielectrophoretic deposition of CNTs to form conducting bridges between adjacent electrodes. For the first time, the creation of conductive CNT bridges spanning lengths over 50 microns is demonstrated. The CNT bridges are permanently secured using electrodeposition of the conducting polymer polypyrrole. Morphologies of the CNT bridges formed within a frequency range of 1 kHz and 10 MHz are explored and explained as a consequence of interplay between dielectrophoretic and electroosmotic forces. Postdeposition heat treatment increases the conductivity of CNT bridges, likely due to solvent evaporation and resulting surface tension inducing better contact between CNTs.
碳纳米管（CNT）团聚体可以沿着相邻电极之间的电场线排列，以形成导电桥。本研究讨论了碳纳米管介电泳沉积以在相邻电极之间形成导电桥的逐步过程。首次展示了跨越长度超过50微米的导电碳纳米管桥的形成。通过导电聚合物聚吡咯的电沉积将碳纳米管桥永久固定。探索并解释了在1 kHz至10 MHz频率范围内形成的碳纳米管桥的形态，这是介电泳力和电渗力相互作用的结果。沉积后热处理提高了碳纳米管桥的导电性，这可能是由于溶剂蒸发以及由此产生的表面张力促使碳纳米管之间实现了更好的接触。
