以Bi(NO3)3和Te粉为原料,水合肼为还原剂,采用水热法保温24h,分别在150℃和180℃制备了Bi2Te3纳米粉末.通过X射线衍射、透射电镜、扫描电镜等分析方法对产物的物相组成和微观形貌进行了表征.实验结果表明,水热法可以制备出纯相纳米级别的Bi2Te3粉末,并且晶粒尺寸随着反应温度升高有增大的趋势.最后采用高温高压法对纳米Bi2Te3粉末进行烧结,分析了烧结温度和压力对样品室温热电性能的影响.结果显示,在0.94GPa、753K条件下烧结后样品的室温功率因子达到16μW/(cm·K2).
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