組織特征
(1. 浙江大學 硅材料國家重點實驗室, 杭州 310027；
2. 太原理工大學 材料科學與工程學院, 太原 030024；
3. 中國人民解放軍北京機械士官學校, 北京 102249)
摘 要: 分別以吡啶、 無水乙醇為反應介質(zhì)，以NaBH4為還原劑，采用溶劑熱合成方法， 在150℃下反應24h制備了平均晶粒尺寸為15~20nm的Bi2Te3納米粒子。采用相同的合成方法， 以去離子水為反應介質(zhì)， 合成了直徑為30~80nm，長徑比大于100的Bi2Te3納米線。 XRD和TEM分析表明， 隨著溶劑介電常數(shù)和極性增加，所生成產(chǎn)物的物相純度、 結晶度增高， 晶粒尺寸增大。
關鍵字: Bi2Te3; 溶劑熱合成; 納米顆粒; 納米線
（ 1.State Key Laboratory of Silicon Materials,
Zhejiang University, Hangzhou 310027， China；
2. Institute of Materials Science and Engineering,
Taiyuan University of Technology,
Taiyuan 030024, China；
3. Beijing Petty Officer School of Mechanics, Beijing 102249, China）
Abstract: Bi2Te3 nano-particles with the average sizes of 15～20nm were prepared by solvothermal synthesis at 150℃ for 24h using pyridine or ethanol as the reaction medium and NaBH4 as the reductant. Bi2Te3 nanowires with diameters less than 100nm and aspect ratios larger than 100 were solvothermally synthesized in distilled water by similar method. XRD and TEM analyses show that the phase purity, crystallization and particle sizes of synthesized powders increase with the increase of the dielectric constant and polarity of the solvent.
Key words: Bi2Te3 ； solvothermal synthesis； nano-particles； nanowire
