溶剂依赖的MoS2量子点光学性质  

Solvent-dependent Optical Properties of MoS2 Quantum Dots

作　　者：张家旗 楚学影[1] 李金华[1] 徐铭泽[1] 金芳军 ZHANG Jia-qi;CHU Xue-ying;LI Jin-hua;XU Ming-ze;JIN Fang-jun(School of Science,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学理学院

出　　处：《发光学报》2019年第11期1359-1364,共6页Chinese Journal of Luminescence

基　　金：教育部“111”创新引智项目(D17017);国家自然科学基金(21703017,11604024);武器装备预研基金重点项目(6140414020102);吉林省科技发展计划(20180519017JH);吉林省国际科技合作项目(20190701029GH);吉林省教育厅项目(JJKH20190551KJ,JJKH20181101KJ,JJKH20181106KJ);中国博士后科学基金(2019M651181);长春理工大学青年基金及科技创新基金(XQNJJ-2018-03,XJJLG-2018-01)资助项目~~

摘　　要：为了明确溶剂对MoS2量子点发光的影响,以液相剥离法在N-甲基吡咯烷酮(NMP)与1,2-二氯苯(DCB)的混合溶剂中制备了MoS2量子点,并采用透析的方法对照研究了溶剂及含有MoS2量子点的溶液的发光性质。结果表明,量子点尺寸分布均匀,粒径约2.4 nm。拉曼光谱中可在381 cm^-1和406 cm^-1处观察到MoS2材料的E2g^1和A1g拉曼特征峰。光学性质分析表明,MoS2量子点的存在造成了260~400 nm附近紫外光吸收的明显变化,且混合溶剂中的MoS2量子点荧光发射波长对激发波长表现出严重的依赖性。以水为外部环境的透析实验结果表明,透析后DCB溶剂的HOMO能级会导致MoS2量子点在442 nm附近的发光出现多个发射峰,但其发光波长不再随激发波长而改变,进而说明有机溶剂中MoS2量子点发光对激发波长的依赖性是由于有机溶剂在紫外光激发下发光造成的。In order to elucidate the effect of solvent on the luminescence of MoS2 quantum dots,MoS2 quantum dots were prepared by liquid phase stripping method in a mixed solvent of N-Methyl pyrrolidone(NMP)and 1,2-dichlorobenzene(DCB).The dialysis method was utilized to compare the luminescent properties of the solvent and the solution containing the MoS2 quantum dots.The results show that the quantum dot size distribution is uniform and the particle size is about 2.4 nm.The E2g^1 and A1 g Raman characteristic peaks of the MoS2 material were observed at 381 cm^-1 and 406 cm^-1 in the Raman spectrum.It was found that the presence of MoS2 quantum dots caused a significant change in the absorbance spectra around 260-400 nm,and the emission wavelength of MoS2 quantum dots in the mixed solvent seriously depended on the excitation wavelength.The results of dialysis experiments with water as the external environment show that the HOMO level of DCB solvent will cause multiple emission peaks in the luminescence of MoS2 quantum dots near 442 nm,but the emission wavelength will no longer change with the excitation wavelength,indicating the dependence of the luminescence of MoS2 quantum dots on the excitation wavelength is due to the luminescence of the organic solvent under ultraviolet excitation.

关 键 词：MoS2量子点 紫外可见吸收谱 荧光发射谱 光学性质 

分 类 号：O469[理学—凝聚态物理]