Fabrication of Multiwall Carbon Nanotube-nanocrystalline Copper Nanocomposite Film by Electrochemical Deposition
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1056-HH09-08
Fabrication of Multiwall Carbon Nanotube-nanocrystalline Copper Nanocomposite Film by Electrochemical Deposition JungJoon Yoo1, JaeYong Song2, and Jin Yu1 1 Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea, Republic of 2 Division of Advanced Technology, Korea Research Institute of Standards and Science, 1 Doryong-dong, Yuseong-gu, Daejeon, 305-600, Korea, Republic of ABSTRACT A new method of fabricating nanocomposite films made up of multiwall carbon nanotube and nanocrystalline copper was developed by using an electrochemical deposition. The electroplated CNT/Cu nanocomposites have the microstructure that CNTs are well dispersed in both the planar and depth directions without any voids in the matrix. The conditions were successfully achieved by using some amphiphilic polymers, organic additives and a pulse electrodeposition method. The microstructure and CNT composition of nanocomposite films were strongly affected by the concentration of CNT in the electrolyte. The mechanical and electrical properties of CNT/Cu nanocomposite films were investigated with the variation of CNT content in the nanocomposite films. INTRODUCTION Since carbon nanotubes were discovered in 1991, there have been many studies on the topics such as their own unique physical and chemical properties, modification of the properties, the formation of composites with other materials, and their application to electronic and biocompatible devices, etc. [1-3]. Until now, it is well-known that CNTs have excellent physical properties such as electrical, thermal and mechanical properties depending upon the crystalline orientation, wall thickness, and chirality [2]. Due to the superior properties, one of the promising applications of CNT is a fabrication of CNT-composite materials based on polymer, ceramic and metal matrices [4-9]. Until now, there have been many studies of composite materials comprising CNTs and metal matrices (e.g. Ni, Cu, and Sn, etc.) in order to improve their mechanical properties [6-9]. Recently, it was reported that mechanical properties of sintered copper could be very much enhanced due to the bridge-effects of CNTs embedded in Cu matrix [9]. The sintering process of CNT/Cu bulk was conducted under a high temperature and high pressure. And there are several studies on the fabrication and physical properties of CNT/Ni composite films [6-8]. Here, we introduce an electrochemical method of synthesizing nanocomposite films made up of CNTs and nanocrystalline copper which is a low cost and low temperature process. The mechanical and electrical properties of copper/CNT nanocomposite films are presented. EXPERIMENT Multiwall carbon nanotubes (diameter 10 ~ 40 nm, length > 1 µm, produced by CNT
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in air for 40 minutes, they were Co.) were used. After CNTs were heat-treated at 350 immersed in the solution of 6 N HCl and strongly stirred for 12 hours in order to remove amorphous carbon and metal catalyst on the surfac
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