摘要
ZnS∶Co2+ nanocrystals were prepared in aqueous solution by both one-step and two-step methods.The surface of the prepared ZnS∶Co2+ nanocrystals was modified by mercaptoacetic acid(TGA).The UV-vis absorption spectroscopy was employed as a direct probe to detect the location of Co2+ dopant in ZnS∶Co nanocrystals.The transition of Co2+4T1g(F)→4T1g(P)was observed from the ZnS∶Co2+ nanocrystals derived by the one-step sample,and the Co2+ 4A2(F)→4T1(P)transition was detected from the ZnS∶Co2+ nanocrystals derived by the two-step sample.The results indicate that Co2+ existed on the surface instead of in the lattice of ZnS nanocrystals derived by the one-step method.And for those ZnS∶Co2+ nanocrystals by using the two-step method,Co2+ were co-precipitated in the lattice of ZnS nanocrystals.And additionally,the band gap of the lattice co-precipitated doped ZnS∶Co2+ nanocrystals was narrower than the pure ZnS samples.
ZnS∶Co2＋ nanocrystals were prepared in aqueous solution by both one-step and two-step methods.The surface of the prepared ZnS∶Co2＋ nanocrystals was modified by mercaptoacetic acid（TGA）.The UV-vis absorption spectroscopy was employed as a direct probe to detect the location of Co2＋ dopant in ZnS∶Co nanocrystals.The transition of Co2＋4T1g（F）→4T1g（P）was observed from the ZnS∶Co2＋ nanocrystals derived by the one-step sample,and the Co2＋ 4A2（F）→4T1（P）transition was detected from the ZnS∶Co2＋ nanocrystals derived by the two-step sample.The results indicate that Co2＋ existed on the surface instead of in the lattice of ZnS nanocrystals derived by the one-step method.And for those ZnS∶Co2＋ nanocrystals by using the two-step method,Co2＋ were co-precipitated in the lattice of ZnS nanocrystals.And additionally,the band gap of the lattice co-precipitated doped ZnS∶Co2＋ nanocrystals was narrower than the pure ZnS samples.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2010年第5期605-608,共4页
Chemical Research and Application
基金
国家自然科学基金委员会(No.u0837605)
教育部"新世纪优秀人才支持计划"(No.NCET-07-0590)
四川省应用基础研究(No.2008JY0039)资助
