Sivakumar Kousik, Panchapakesan Balaji
Department of Electrical and Computer Engineering, University of Delaware, Newark, DE 19716, USA.
J Nanosci Nanotechnol. 2005 Feb;5(2):313-8. doi: 10.1166/jnn.2005.050.
Manipulation and control of matter at the nanoscale and atomic scale levels are crucial for the success of nanoscale sensors and actuators. The ability to control and synthesize multilayer structures using carbon nanotubes that will enable the building of electronic devices within a nanotube is still in its infancy. In this paper, we present results on selective electric field-assisted deposition of metals on carbon nanotubes realizing metallic nanowire structures. Silver and platinum nanowires have been fabricated using this approach for their applications in chemical sensing as catalytic materials to sniff toxic agents and in the area of biomedical nanotechnology for construction of artificial muscles. Electric field-assisted deposition allows the deposition of metals with a high degree of selectivity on carbon nanotubes by manipulating the charges on the surface of the nanotubes and forming electrostatic double-layer supercapacitors. Deposition of metals primarily occurred due to electrochemical reduction, electrophoresis, and electro-osmosis inside the walls of the nanotube. SEM and TEM investigations revealed silver and platinum nanowires between 10 nm and 100 nm in diameter. The present technique is versatile and enables the fabrication of a host of different types of metallic and semiconducting nanowires using carbon nanotube templates for nanoelectronics and a myriad of sensor applications.
在纳米尺度和原子尺度上对物质进行操纵和控制，对于纳米级传感器和致动器的成功至关重要。利用碳纳米管控制和合成多层结构以实现纳米管内电子器件构建的能力仍处于起步阶段。在本文中，我们展示了在碳纳米管上选择性电场辅助沉积金属以实现金属纳米线结构的结果。银和铂纳米线已通过这种方法制造出来，用于化学传感中作为检测有毒物质的催化材料，以及在生物医学纳米技术领域用于构建人造肌肉。电场辅助沉积通过操纵纳米管表面的电荷并形成静电双层超级电容器，使金属能够高度选择性地沉积在碳纳米管上。金属的沉积主要是由于纳米管壁内的电化学还原、电泳和电渗作用。扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究表明，银和铂纳米线的直径在10纳米至100纳米之间。目前的技术具有通用性，能够使用碳纳米管模板制造多种不同类型的金属和半导体纳米线，用于纳米电子学和众多传感器应用。
