气相氧化法制备氧化锌的结晶形貌

研究了锌蒸气高温气相氧化条件对氧化锌结晶形貌的影响结果.结果表明:气相氧化法制备的氧化锌有无定形、颗粒状、单针状、四针状、多针状等5种典型的结晶形貌;这些结晶形貌与原料锌粉的粒度及表面状态没有直接联系,但都强烈地依赖于锌蒸气氧化时的物理化学环境;在不同的氧分压下,锌蒸气具有不同的氧化行为,由此导致了不同形貌的氧化锌结晶;通过改变制备条件可以有效地调控氧化锌的结晶形貌.

Crystal morphologies of ZnO obtained by oxidizing zinc vapor

The effects of conditions of oxidizing zinc vapor at high temperature on the crystal morphologies of ZnO were investigated. The results show that there are five typical morphologies: amorphous, granular, needle, tetrapod and multipod-like ZnO, depending on the physical chemical conditions of oxidizing zinc vapor and having no direct relations with particle size and surface conditions of zinc powders, the raw materials. The behavior of oxidizing zinc vapor varies with the oxygen partial pressure, which leads to producing ZnO crystals of different morphologies that can be controlled by the change of preparing conditions.