Dynamic optoelectric trapping and deposition of multiwalled carbon nanotubes.

摘要: In the path toward realization of carbon nanotube (CNT)-driven electronics and sensors, ability to precisely position CNTs at well-defined locations remains a significant roadblock. Highly complex CNT-based bottom–up structures can be synthesized if there is method accurately trap place these nanotubes. this study, we demonstrate that rapid electrokinetic patterning (REP) technique accomplish tasks. By using laser-induced alternating current (AC) electrothermal flow particle–electrode forces, REP collect maneuver wide range vertically aligned multiwalled (from single over 100 nanotubes) on an electrode surface. addition, trapped nanotubes electrophoretically deposited any desired location onto Apart from active control nanotubes, number in also dynamically tuned by changing AC frequency or adjusting concentration dispersed On basis calculation stiffness trap, found upper limit manipulation speed, beyond which fall out trap. This peak speed dependent velocity, varied strength electric field. A for positioning nanostructures could enable intricate electronic devices. Carbon are hollow cylinders atoms with excellent electrical properties. However, they difficult manipulate due their ultrasmall size. Steve Wereley Purdue University United States his colleagues used laser beam field align surface electrode. The team’s technique—known as patterning—works trapping translating suspended water between two electrodes. Laser light heat small volume liquid, changes its permittivity conductivity. When combined electrodes, generates vortices multiple then positioned moving beam.