利用超臨界水還原方法製備奈米金屬及奈米金屬氧化物粉體之研究

Abstract

不同於超臨界水水熱結晶製備奈米金屬氧化物，本研究以超臨界水還原方法製備奈米金屬及金屬氧化物。本研究使用四種前驅物，分別為硫酸鐵，硫酸銅，硫酸銀及四氯化鉑，並以甲酸作為還原劑，合成奈米四氧化三鐵、奈米銅、奈米銀及奈米白金。本研究主要探討欲得到不同奈米金屬及奈米金屬氧化物所需還原劑之濃度，及所得產物之粒徑大小及其分佈。由各產物之TEM圖所測得之粒徑大小，奈米銅平均粒徑約為18奈米，奈米銀約為28奈米，奈米白金約為10奈米。除成功製備奈米金屬，本研究亦提出超臨界水還原反應方程式。

In this study, supercritical water reduction (SCWR) method was applied to prepare metal oxide and metal nanoparticles. Different from the supercritical water hydrothermal crystallization, reduction methods was used to obtain the nanoparticles. Four kinds of metal precursors, ferric sulfate, copper sulfate, and silver sulfate, were employed in this study to prepare Fe3O4, Cu, Ag, and Pt nanoparticles. The effect of reducing agent concentration was examined. TEM micrographs showed that average particle size of copper, silver, platinum are about 18nm, 28nm and 10nm, respectively. The reaction mechanism for supercritical water reduction was also proposed in this study.