摘要
以硝酸铋为铋源、硫脲为硫源,分别以小分子有机物-巯基乙酸、柠檬酸及聚合物半导体-羧基化PPV（羧基化的聚对苯乙炔）为模板,利用水热反应法制备了不同形貌的Bi2S3微晶,并对产物用X射线衍射（XRD）、扫描电子显微镜（SEM）、紫外-可见-近红外光谱（UV-Vis-Near-IR）等进行表征。结果表明,所制备的Bi2S3微晶为斜方晶系的辉铋矿;在巯基乙酸的作用下,Bi2S3排列成直径约为2~3μm的花状微晶;在柠檬酸的作用下,Bi2S3晶体呈絮状,结成直径约为2μm左右的绒球;在羧基化PPV的作用下,Bi2S3构成直径约为2μm的绒球。通过由UV-VisNear-IR光谱绘制的（αhν）2~hν曲线图计算得到,在不同有机物模板作用下得到的Bi2S3微晶的能带间隙均大于无模板作用得到的Bi2S3,且羧基化PPV的作用效果优于小分子有机物,使能带间隙提高为1.64 eV。
Bi2S3microcrystals with different morphologies were successfully prepared by hydrothermal reaction between bismuth nitrate and thiourea,using thioglycolic acid,citric acid and carboxylic PPV as templates respectively.The products were characterized by XRD,SEM and UV-Vis-Near-IR spectrum.The orthorhombic crystal structure were revealed by XRD.SEM indicates that flowlike Bi2S3is synthesized with thioglycolic acid,while in the exist of citric acid,Bi2S3is flocculent and gathered into a pompon with 2 μm in diameter.In addition,pompon-like Bi2S3with 2-3 μm in diameter was successfully synthesized with the influence of carboxylic PPV.The（αhν）2-hν curves obtained from UV-Vis-Near-IR spectrum show that the band gap of Bi2S3prepared with different templates are broader than Bi2S3without template.Especially,the band gap of Bi2S3prepared with carboxylic PPV is 1.64 eV.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第6期1408-1413,1419,共7页
Journal of Synthetic Crystals
基金
合肥工业大学青年教师创新项目(2011HGQC1006)
