文献类型：期刊文献

英文题名：Quantum-dots based materials for temperature sensing: effect of cyclic heating-cooling on fluorescence

作者：Chen, Ying[1];Luan, Weiling[1];Zhang, Shaofu[1];Yang, Fuqian[2]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China;[2]Univ Kentucky, Dept Chem & Mat Engn, Mat Program, Lexington, KY 40506 USA

年份：2019

卷号：21

期号：8

外文期刊名：JOURNAL OF NANOPARTICLE RESEARCH

收录：;EI(收录号：20193407337528);WOS:【SCI-EXPANDED(收录号:WOS:000481808400001)】；

基金：W Luan is grateful for the financial support from the National Natural Science Fund of China (51475166).

语种：英文

外文关键词：QDs; Heating-cooling; PL intensity; Wavelength; Irreversibility; Temperature sensor

摘要：Using the temperature dependence of the fluorescence of quantum dots (QDs) in the sensing of temperature is a promising field. In this work, we systematically study the effect of cyclic heating and cooling on the fluorescence of CdSe/ZnS QD and PMMA-QD composite in air. The experimental results show that increasing the temperature causes red-shift of the PL (photoluminescence) emission peak and the decrease of the PL intensity, and decreasing the temperature causes blue-shift of the PL emission peak and the increase of the PL intensity for all the QDs presented in both media. There exists a critical temperature, above which the heating completely damages the surface structures of the QDs and leads to the loss of the luminescence characteristics of the QDs. Placing CdSe/ZnS QDs in PMMA causes blue-shift of the PL emission peak, which likely is due to the shift of the ground state energy of the QDs. The heating-cooling cycle with high peak temperature up to 310 degrees C does not change the crystal structure of the ZnS in the CdSe/ZnS QDs.