Excellent photothermal conversion of core/shell CdSe/ Bi2Se3 quantum dots

• Published in: Nano research Vol. 8; no. 5; pp. 1443 - 1453
• Main Authors: Jia, Guo Zhi, Lou, Wen Kai, Cheng, Fang, Wang, Xiong Long, Yao, Jiang Hong, Dai, Ning, Lin, Hai Qing, Chang, Kai
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01-05-2015
• Subjects: Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; CdSe; Chemistry and Materials Science; Condensed Matter Physics; Materials Science; Nanotechnology; Research Article; 光热转换; 半导体异质结构; 热转换效率; 热转换系数; 离子交换反应; 量子点; 阳离子交换; photothermal; quantum dots; type-II heterostructure; Se; CdSe/Bi; cation exchange
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-014-0629-2

Water-dispersed CdSe/Bi2Se3 core/shell QDs with a photothermal conversion coefficient of 27.09% have been synthesized by a cation exchange reaction. The microstructure and crystal structure of the QDs, which were confirmed by TEM and XRD, showed that partial cation exchange occurred inside the CdSe QDs. Two main mechanisms are responsible for the excellent photothermal conversion： inhibition of radiative recombination of carriers due to the formation of type-II semiconductor heterostructures, and the large surface-to-volume ratio of the QDs. Photothermal conversion experiments indicated that the CdSe/Bi2Se3 QDs showed high photothermal conversion efficiency and excellent NIR photostability.