液相還元法에 의한 白金 나노粉末 製造
Preparation of Nano-sized Pt Powders by Solution-phase Reduction
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초록
백금은 물리화학적 특성에 기인하여 많은 분야에서 중요한 역할을 하고 있으며, 이러한 분야에서는 아주 미세한 백금의 사용을 요구하고 있다. 그러므로 본 연구에서는 액상에서 환원제를 사용하여 백금염을 환원시킴으로서 나노크기의 백금을 제조하는 방법에 대하여 알아보았다. 수용액상에서 C14TABr과 H2[PtCl6]의 상호작용은 [C14TA]2[PtCl6]의 유기백금염 화합물을 형성한다. 단분산 나노 백금입자를 얻기 위해서는 C14TABr과 H2[PtCl6] 농도가 각각 cmc와 0.32mM 이상이 되어야 한다. H2[PtCl6]와 C14TABr 농도가 증가함에 따라 백금입자 크기가 증가하였으며, 백금입자의 형태는 C14RABr농도 증가에 따라 제어가 가능하였다.
Abstract
Platinum plays an important role in many applications because of its extraordinary physical and chemical properties. All these applications require the use of platinum in the finely divided state. Therefore the preparation of platinum nanoparticles by reducing platinum-surfactant salt with reducing agent in the solution was investigated in this study. The net interaction between C14TABr and H2[PtCl6] in aqueous solution results in the formation of [C14TA]2[PtCl6]. The concentration of C14TABr and the concentration of H2[PtCl6] has to be above cmc and 0.32mM, respectively in order to obtain complex-micelle aggregation for mono dispersed Pt particles. Pt particle size increases with increasing H2[PtCl6] and C14TABr concentration. And the shape of Pt particles was well controlled with increasing surfactant concentration.
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