전착법을 이용한 메조포러스 니켈 필름의 제조와 특성 분석
Preparation and Characterization of Mesoporous Ni Film Made by Electroplating Method
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초록
메조포러스(mesoporous) 물질은 포아(pore)의 크기가 2~50 nm의 범주에 해당하는 미세 기공을 갖는 물질로 나노포러스 물질이라고도 하며, 포아의 크기 및 구조를 주형물질(template)인 이온성 또는 비이온성 계면활성제의 선택에 따라 비교적 용이하게 조절할 수 있는 소재이다. 이러한 메조포러스 물질은 학계나 산업계에서 획기적인 발전을 거듭해오고 있으며 최근에는 나노 소재 기술의 핵심으로서 부각되고 있다
Abstract
Recently, mesoporous metallic materials are becoming more and more important in various applications like catalysts, electrochemical detectors, batteries, and fuel cells because of their high surface area. Among the various methods for manufacturing mesoporous structure, surfactant templating method followed by electroplating has been tried in this study. A mesoporous metallic film was prepared by electrodeposition from electroplating solution mixed with surfactant template. Nonionic type lyotropic liquid crystalline surfactant, Brij56, and nickel acetate based solution were selected as a template material and electroplating solution, respectively. To determine the content of surfactant forming a hexagonal column structure, the phase diagram of electroplating solution and surfactant mixture has been exploited by polarized optical microscopy equipped with heating and cooling stage. Nickel films were electroplated on Cu foil by stepwise potential input method to alleviate the concentration polarization occurred during the electroplating process. TEM and XRD analyses were performed to characterize the size and shape of mesostructures in manufactured nickel films, and electrochemical characterization was also carried out using cyclic voltammetry.
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