탄소나노튜브 합성 시 촉매 금속의 분산도 향상을 위한 Ti Substrate의 표면 개질 연구

Abstract

This paper describes the surface modification effect of a Ti substrate for improved dispersibility of the catalyticmetal. Etching of a pure titanium substrate was conducted in 50% H2SO4, 50oC for 1 h-12 h to observe the surfaceroughness as a function of the etching time. At 1 h, the grain boundaries were obvious and the crystal grains weredistinguishable. The grain surface showed micro-porosities owing to the formation of micro-pits less than 1 μm in diameter. The depths of the grain boundary and micro-pits appear to increase with etching time. After synthesizing the catalyticmetal and growing the carbon nano tube (CNT) on Ti substrate with varying surface roughness, the distributiontrends of the catalytic metal and grown CNT on Ti substrate are discussed from a micro-structural perspective.