纳米结构Bi_2S_3的制备及其发光特性  

PREPARATION AND PHOTOLUMINESCENCE OF NANOSTRUCTURED Bi_2S_3

作　　者：张卫新[1] 邱沫[1] 张钧君[1] 杨则恒[1] 陈敏[1] 

机构地区：[1]合肥工业大学化工学院可控化学与材料化工安徽省重点实验室,合肥230009

出　　处：《硅酸盐学报》2009年第5期827-831,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(20871038;20876031);安徽省自然科学基金(070414165);安徽省高等学校省级科技创新团队计划(TD200702)资助项目

摘　　要：以硝酸铋和硫化钠为原料,用两步水热法于100℃成功制备了正交晶系Bi2S3微米环;又以硝酸铋和硫脲为原料,采用一步水热法于150℃制备了同属于正交晶系的Bi2S3纳米棒。分别以X射线衍射仪、场发射扫描电镜、透射电子显微镜和荧光分光光度法等测试手段对最终产物的物相、形貌和性质进行了表征,探讨了Bi2S3微米环的形成机理。结果表明:Bi2S3微米环的内径为1～1.5μm、外径为1.5～2μm,由平均尺寸大约为100nm的纳米晶粒组装而成。Bi2S3纳米棒的直径约125nm、长度为1～2μm。Bi2S3微米环和纳米棒状Bi2S3的发光峰分别位于447nm处和470nm处,Bi2S3微米环发光峰的位置相比于Bi2S3纳米棒的发光峰位置明显发生了蓝移。Orthorhombic bismuth sulfide （Bi2S3） microrings were successfully prepared by the two-step hydrothermal method at 100℃ using Bi（NO3）3·5H2O and Na2S·9H2O as starting materials; orthorhombic Bi2S3 nanorods were also fabricated by the one-step hydrothermal method at 150℃ using Bi （NO3）3·5H2O and thiourea as starting materials. The structure, morphology and luminescence properties of the products were characterized by X-ray powder diffraction, field-emission scanning electron microscopy, transmission electron microscopy and fluorospectrophotometry. The formation mechanism of Bi2S3 microrings is discussed. The results indicate that the as-prepared Bi2S3 microrings with outer diameters of 1.5-2.0 μm and inner diameters of 1.0-1.5 μm are composed of many nanocrystals with an average size of about 100nm. The Bi2S3 nanorods have a diameter of about 125 nm and a length of 1-2 μm. The photoluminescence peaks of Bi2S3 microrings and Bi2S3 nanorods are located at 447 and 470 nm, respectively. The photolumi-nescence peak of Bi2S3 microrings has a blue-shift compared with that of Bi2S3 nanorods.

关 键 词：硫化铋 水热法 纳米结构 光致发光 

分 类 号：O613.51[理学—无机化学]