CoS量子点的尺寸可控制备及光学性质研究  

Research on Size Controllable Preparation and Optical Properties of CoS QDs

作　　者：胡坤 张泰玮 李国彬 李学铭[1] 唐利斌[2,3] 杨培志 HU Kun;ZHANG Taiwei;LI Guobin;LI Xueming;TANG Libin;YANG Peizhi(Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,School of Energy and Environmental Sciences,Yunnan Normal University,Kunming 650500,China;Kunming Institute of Physics,Kunming 650223,China;Yunnan Key Laboratory of Advanced Photoelectric Materials&Devices,Kunming 650223,China)

机构地区：[1]云南师范大学能源与环境科学学院,可再生能源材料先进技术与制备教育部重点实验室,云南昆明650500 [2]昆明物理研究所,云南昆明650223 [3]云南省先进光电材料与器件重点实验室,云南昆明650223

出　　处：《云南师范大学学报（自然科学版）》2023年第5期5-8,共4页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：云南省科技厅科技人才与平台计划资助项目(202205AC160026);“春城计划”高层次人才引进培养工程资助项目(2022SCP005).

摘　　要：采用液相超声剥离法成功制备了CoS量子点(QDs),使用透射电子显微镜(TEM)对CoS QDs的形貌和结构进行了表征,利用紫外-可见分光光度计(UV-Vis)和荧光光谱仪(PL)测试了样品的吸光度和不同激发波长下的荧光强度.测试结果表明:在离心转速为4500、3000 r/min和1500 r/min时,CoS QDs的平均尺寸分别为3.4、3.6 nm和4.4 nm;三种尺寸的CoS QDs具有宽带光吸收特性,并且随着量子点尺寸的增加,CoS QDs的吸收范围逐渐变宽,PL峰表现出Stokes位移和激发波长依赖性.CoS quantum dots(QDs)were successfully prepared by liquid-phase ultrasonic exfoliation,and the morphology and structure of CoS QDs were characterized by transmission electron microscopy(TEM).The absorbance and fluorescence intensity at different excitation wavelengths of the samples were measured by UV-Vis spectrophotometer and fluorescence spectrometer.The average sizes of CoS QDs were 3.4,3.6 nm,and 4.4 nm at centrifugation speeds of 4500,3000 r/min,and 1500 r/min,respectively.The results showed that the three sizes of CoS QDs had broadband optical absorption properties,and the absorption range of CoS QDs gradually widened with the increase of quantum dot size.The PL peaks exhibited Stokes shifts and excitation wavelength dependence.The broadband optical absorption and luminescence properties of CoS QDs indicate its potential use in optical devices.

关 键 词：液相超声剥离 硫化钴 量子点 红外特性 

分 类 号：O433.4[机械工程—光学工程] O644.3[理学—光学]