低温湿化学还原法制备Bi2Te3单晶纳米棒

采用低温湿化学还原法,以Bi(NO3)3·5H2O和TeO2为原料,通过乙二胺四乙酸(EDTA)参与调节使反应体系为中性,以NaBH4为还原剂,以表面活性剂Brij56(HO(CH2CH2O)10C16H33)为晶体生长调控剂,制备了Bi2Te3纳米棒.通过X射线衍射(XRD)、X射线荧光探针(XRF),扫描电镜(SEM)、透射电镜(TEM)和高分辨透射电镜(HRTEM)对样品的组成和结构进行了分析,同时初步探讨了Bi2Te3纳米棒的生长机理.结果表明,制备的Bi2We3纳米棒直径在30nm左右,长度在400nm左右,具有单晶结构;反应温度和Brij56的浓度对晶体形貌有较大的影响.

Preparation of Single Crystalline Bi2Te3 Nanorods through Chemical Reduction at Low Temperature

Bi₂Te₃ nanorods were successfully prepared through chemical reduction at low temperature. In this process, Bi(NO₃)₃·5H₂O and TeO₂ were used as reactants, NaBH4 was used as reductant, and Brij56 (HO(CH₂CH₂O)₁₀C₁₆H₃₃) was used as regulator of crystal growth. EDTA was added into the solution to prevent the hydrolyzation of reactants at about pH 7.0. As-synthesized sample was characterized by X-ray diffraction and X-ray fluorescence, scanning electron microscope, transmission electron microscope, and high-resolution transmission electron microscope. Results show that Bi₂Te₃ nanorods are single crystalline, 30nm in diameter and 400nm in length. The temperature and the concentration of the surfactant Brij56 have obvious effects on the morphologies and sizes of synthesized sample. The growth mechanism of Bi₂Te₃ nanorods is also discussed.