Sb2Te3纳米片的水热合成与表征

Hydrothermal Synthesis and Characterization of Sb_2Te_3 Nanoplates

在水热条件下,以乙醇胺为还原剂,实现了亚碲酸根(TeO^(2-)_3)的分步还原,并以新生成的单质Te纳米棒为碲源,原位一步法合成出六方相Sb_2Te_3纳米片.采用X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)和透射电子显微镜(TEM)等对产物的物相、形貌及组成进行了表征.结果表明,产物Sb_2Te_3为六方纳米片,厚度约为100~200 nm,直径约为0.6~1.5μm,形貌均一,分散性良好.适宜的合成条件是水/乙醇胺体积比为8∶12,180℃下反应24 h.依据部分实验结果以及单质Te和六方相Sb_2Te_3晶体结构的比较,证明了Sb_2Te_3主要以外延方式在单质Te纳米棒表面生长,且两者的晶面取向为(003)Te//(003)Sb_2Te_3,[110]Te//[110]Sb_2Te_3.

Under hydrothermal conditions and with ethanolamine acting as the reducing agent,fractional reduction of Te O3^2-was realized,and Sb_2Te_3 nanoplates were synthesized in situ with the newly generated Te nanorods acting as tellurium source. The as-prepared product was characterized by X-ray powder diffractometer（ XRD）,field emission scanning electron microscope（ SEM）,and transmission electron microscope（ TEM）.Results showed that the product presents the hexastyle nanoplate structure with the thickness of about 100—200 nm and the diameter of about 0. 6—1. 5 μm,and has a uniform morphology and good dispersibility. The suitable conditions were that the volume ratio of water to ethanolamine was 8 ∶ 12,and the reaction lasted for24 h at 180 ℃. By comparing the crystal structures of the elemental Te and hexagonal Sb2Te3 as well as some experimental results,that the hexagonal phase Sb2Te3 grew epitaxially on the lateral sides of newly generated Te nanorods was discussed preliminarily,and their crystal orientations were（ 003） Te / /（ 003） Sb2Te3,and[110]Te / /[110]Sb2Te3.