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báo cáo hóa học:" Selective Deposition and Alignment of Single-Walled Carbon Nanotubes Assisted by Dielectrophoresis: From Thin Films to Individual Nanotubes"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Selective Deposition and Alignment of Single-Walled Carbon Nanotubes Assisted by Dielectrophoresis: From Thin Films to Individual Nanotubes | Nanoscale Res Lett 2010 5 1072-1078 DOI 10.1007 s11671-010-9604-3 NANO EXPRESS Selective Deposition and Alignment of Single-Walled Carbon Nanotubes Assisted by Dielectrophoresis From Thin Films to Individual Nanotubes Pengfei Li Wei Xue Received 15 March 2010 Accepted 5 April 2010 Published online 17 April 2010 The Author s 2010. This article is published with open access at Springerlink.com Abstract Dielectrophoresis has been used in the controlled deposition of single-walled carbon nanotubes SWNTs with the focus on the alignment of nanotube thin films and their applications in the last decade. In this paper we extend the research from the selective deposition of SWNT thin films to the alignment of small nanotube bundles and individual nanotubes. Electrodes with teeth -like patterns are fabricated to study the influence of the electrode width on the deposition and alignment of SWNTs. The entire fabrication process is compatible with optical lithography-based techniques. Therefore the fabrication cost is low and the resulting devices are inexpensive. A series of SWNT solutions is prepared with concentrations ranging from 0.0125 to 0.2 mg ml. The alignment of SWNT thin films small bundles and individual nanotubes is achieved under the optimized experimental conditions. The electrical properties of these samples are characterized the linear current-voltage plots prove that the aligned SWNTs are mainly metallic nanotubes. The microscopy inspection of the samples demonstrates that the alignment of small nanotube bundles and individual nanotubes can only be achieved using narrow electrodes and low-concentration solutions. Our investigation shows that it is possible to deposit a controlled amount of SWNTs in desirable locations using dielectrophoresis. Keywords Single-walled carbon nanotubes SWNT Dielectrophoresis DEP Thin film Nanotube bundle Individual nanotube Deposition P. Li W. Xue Mechanical Engineering School of Engineering and Computer Science Washington State .