配体对水相一锅法制备Cu-In-Zn-S量子点的影响

Effect of the Ligands on Cu–In–Zn–S Quantum Dots via One-Pot Preparation in Aqueous Solutions

以谷胱甘肽(GSH)和柠檬酸钠(SC)为双配体,采用"一锅法"在水相中制备Cu–In–Zn–S(CIZS)四元合金量子点。分别研究了GSH和SC两种配体的添加量对CIZS量子点的制备及其荧光性能的影响。利用XRD、TEM和荧光发射谱分别对所制备量子点的物相、显微形貌以及发光性能进行表征,采用FT-IR和Raman光谱分别分析了配体与量子点的结合机理以及量子点的相组成。实验结果表明:当GSH/Cu^+=5时,发生了In_2S_3相分离现象,通过进一步增加GSH用量可以抑制相分离现象发生。同时,随着GSH或SC添加量的增加,CIZS量子点团聚长大,其粒径由2 nm增加到4 nm左右,因此造成了PL谱的红移。FT-IR结果表明GSH和SC主要分别由–SH、–NHR和–C–O–基团与量子点配位;Raman光谱证实了CIZS量子点中黄铜矿(CH)结构与铜金(CA)有序结构共存。

Cu-In-Zn-S （CIZS） quaternary quantum dots （QDs） were prepared via one-pot method in aqueous solution by using glutathione （GSH） and sodium citrate （SC） as dual ligands. The effects of the addition amount of two ligands on the preparation and the PL property of CIZS QDs were studied. The phase, microscopic morphology and photoluminescence （PL） property were measured by means of XRD, TEM and PL spectra, respectively. The bonding mechanism of ligands and the phase composition of QDs were studied by FT-IR and Raman spectra. The results showed that the In2S3 phase was observed with the GSH/Cu＋ ratio at 5, but this phase separation could be avoided by increasing the addition amount of GSH. Increasing the addition amount of GSH or SC, CIZS QDs were agglomerated significantly, and the size was increased from 2 nm to 4 nm, resulting in a red shift of the PL spectra. The FT-IR results showed that GSH and SC were mainly coordinated with QDs by -SH, -NHR and -C-O-, respectively. Raman spectrum confirmed that chalcopyrite （CH） phase and Cu-Au （CA） ordered phase coexisted in the CIZS QDs.