片状纳米氧化锌单晶的制备和表征(英文)

Preparation and Characterization of Sheet Nano-zinc Oxide Single Crystal

本文提供了一种应用二步法制备片状纳米氧化锌单晶的实验方法———首先 ,以尿素为沉淀剂宿主 ,以氯化锌、碱式碳酸锌为原料 ,应用均匀沉淀法获得纳米氧化锌的片状纳米级前驱物 ;然后通过控温热分解前驱物制备出片状纳米氧化锌单晶。用扫描电镜观测了制备的ZnO单晶的形貌 ,并通过红外光谱对其进行了表征。结果表明 :实验制备的氧化锌均为无色透明的片状单晶 ,结晶形貌为正六边形、五边形、矩形以及其它不规则形状 ,单晶直径在 30～ 6 0 0 μm之间 ,厚 30～ 6 0nm ;影响纳米氧化锌单晶制备的主要因素是反应物料配比、沉淀剂宿主尿素的浓度(1∶6 )以及反应温度 (70～ 85℃ )。此外 ,乙醇的含量对片状纳米前驱物的形貌影响很大 ,10 %～ 4 0 %的乙醇含量利于形成片状纳米氧化锌单晶。

This paper presented a two-step method to prepare sheet nano-zinc oxide single crystals(SNOSC).The precursor of SNOSC was first made by homogeneous precipitation method (HPM), using zinc chloride and alkali zinc carbonate as the raw materials and carbamide as the precipitant. Then the SNOSC was obtained by the thermal decomposition of the precursor. The prepared SNOSC is colorless and transparent with a hexagonal, pentagonal, rectangular or an irregular form, as examined by IR spectra and SEM. The single crystal is 30-600μm in diameter and 30-60nm in thickness . The important factors to the preparation are the ratio of reaction materials, the concentration of carbamide (1:6) and the reaction temperature (70-85℃). In addition, the content of ethanol ranging 10%-40% appears favorable for the formation of the precursor of SNOSC .