Aug 11, 2010
In situ parallel integration of carbon nanotubes
An optically controlled approach has been devised to achieve precise in situ parallel integration of carbon nanotubes (CNTs) on micro/nano-architectures. This simple and inexpensive technique points towards a promising route for scalable production of CNT-integrated devices.
Researchers from the Laser-Assisted Nano Engineering (LANE) Lab in the Department of Electrical Engineering at the University of Nebraska-Lincoln (UNL), US, are using tip-induced enhancement of optical near-fields as a driving force to direct the controlled integration of CNTs. To grow the CNTs, the researchers have developed a laser-assisted chemical vapor deposition (LCVD) technique. A continuous-wave CO2 laser is used as an irradiation source, and the group has studied the growth process on electrode arrays containing different patterns.
Growing CNTs to connect electrodes of different orientations can be realized by tuning the polarization of the laser. Only electrode tips that followed the polarization were selectively heated up and precisely connected. Parallel integration of CNTs into multiple sites can be achieved by covering the regions of interest with the laser beam.
This laser-based synthetic strategy provides a simple, inexpensive and scalable way to fabricate CNT-integrated devices and structures and achieve CNT-based electronics and devices.
Full details can be found in the journal Nanotechnology.
About the author
This study was conducted in the Department of Electrical Engineering at UNL. The LANE lab at UNL focuses on developing laser-based techniques in the field of nanotechnology. Dr Yunshen Zhou is currently a research assistant professor. Wei Xiong, Yang Gao, Masoud Mahjouri-Samani and Matt Mitchell are all graduate students at UNL. Dr Yongfeng Lu, the group leader, is the Lott University Professor of Engineering at UNL and conceived the original concept of this study. Prof. Lan Jiang is a Changjiang Distinguished Professor at Beijing Institute of Technology and an adjunct professor at UNL. The authors would also like to thank Joel Brehm from the Office of Research, UNL, for his excellent graphic work.