水热法合成纳米氧化铪及碳/氧化铪核壳结构纳米复合粉体的研究

Hydrothermal Synthesis of HfO_2 Nanoparticles and C/HfO_2 Nanopowders with Core-shell Structure

纳米技术是近几十年来材料科学的一个重要发展方向。由于纳米材料异于体相材料的特异性能,如巨大的比表面积、显著的量子尺寸效应和表面效应等,在新材料领域,如先进陶瓷材料、复合材料和催化材料等方面获得了广泛的应用。有关其制备、表征及应用研究在科技论文中已有大量报道。目前基于化学原理合成纳米材料的方法主要有沉淀法、溶胶凝胶法、低温合成法围及水热法等。

Nano-sized HfO2, C and C/HfO2 powders obtained through hydrothermal process have been investigated by XRD, TEM and FTIR, and Different precursors, namely Hafnium（Ⅱ） oleate and Hafnium（Ⅱ） hydroxide derived from homogeneous precipitation method, have been chosen for the synthesis of nanometric HfO2 via hydrothermal process. The results indicate that using the former material as the precursor under identically hydrothermal process can yield finer HfO2 nanoparticles, compared to using the latter. Nano-sized Carbon of about 100 nm with square morphology and narrow size distribution can be obtained through hydrothermal reaction of sucrose solution at 200 ℃ for 6 h. The addition of as-synthesised Carbon nanoparticles into the hydrothermal process of HfO2 powder can produce C/HfO2 composite powders with core-shell structure.