微波水热时间对CuS微晶形貌及光学性能的影响  

Influences of Reaction Time on the Morphology and Optical Property of CuS Microcrystallites Prepared by Microwave Hydrothermal Method

作　　者：齐慧[1] 黄剑锋[1] 曹丽云[1] 李嘉胤[1] 吴建鹏[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,西安710021

出　　处：《人工晶体学报》2011年第5期1188-1193,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(50942047);陕西省自然科学基金(2010JM6001);陕西科技大学研究生创新基金资助项目

摘　　要：采用微波水热法,以Cu(NO3)2.3H2O和SC(NH2)2为原料,在无模板剂的条件下,对靛铜矿CuS微晶进行了形貌的可控制备。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和紫外可见吸收光谱(UV-vis)分别对产物的物相,形貌和光学性能进行了表征。结果表明:微波水热条件下,反应温度为150℃时,反应时间仅为5 min即可得到CuS微晶,随着反应时间的延长,产物的结晶性逐渐提高,同时其形貌由纳米片形成的花球形逐渐转变为卷曲的棒状结构。所制备的CuS微晶具有较强的可见光吸收特性,同块体材料相比有明显的红移,其光学禁带宽度显著降低。此外,伴随产物形貌随时间的变化,其禁带宽度也发生相应改变,表明通过改变微波加热时间(10～40min),可对所得产物的光学性质进行控制。Covellite copper sulfide microcrystallites were prepared by a template-free microwave hydrothermal method using Cu（NO3）2·3H2O and SC（NH2）2 as raw materials.The phase,morphology and optical properties of as-prepared samples were characterized by XRD,SEM and UV-vis absorption spectra.The results indicated that copper sulfide microcrystallites could be obtained at 150 ℃ within only 5 min,and the crystallinity of products increases as the reaction time increasing.Correspondingly,the sphere-like morphology assembled by nanoslices changes to curled rod-like structure as the hydrothermal time incearsing.UV-vis absorption spectra showed that the samples have a strong absorption in visible band with a obvious red shift comparing to the common bulky CuS particles.Besides,the bandgaps of the as-prepared CuS particles changes with different reaction time.This indicated the morphology-related optical properties of the products could be controlled by varying the microwave reaction time from 10 min to 40 min.

关 键 词：微波水热法 CuS微晶 形貌 禁带宽度 

分 类 号：O614.12[理学—无机化学]