Preparation and Optical Properties of A Surface Modified CdTe Quantum Dots

doi:10.7517/j.issn.1674-0475.2009.03.161

Imaging Science and Photochemistry ›› 2009, Vol. 27 ›› Issue (3): 161-167.DOI: 10.7517/j.issn.1674-0475.2009.03.161

Preparation and Optical Properties of A Surface Modified CdTe Quantum Dots

XU Shi-chao^1,3, YAO Cui-cui¹, ZHANG Ji-mei¹, DAI Zhao¹, SUN Bo², ZHENG Guo¹, HAN Qing¹, HU Fei¹, ZHOU Hong-ming¹

1. School of Material Science and Chemical Engineering, Key Laboratory of Hollow Fiber Membrane Materials and Membrane Processes(Ministry of Education), Tianjin Polytechnic University, Tianjin 300160, P.R.China;
2. School of Chemistry, Nankai University, Tianjin 300071, P.R.China;
3. Research Institute Biologic and Spinning Materials, Tianjin Polytechnic University, Tianjin 300160, P.R.China

Received:2008-09-01 Revised:2008-10-27 Online:2009-05-23 Published:2009-05-23

Abstract

Abstract: The well-dispersed CdTe quantum dots(QDs) with high fluorescence were synthesized in aqueous phase via thioglycolic acid(TGA) as stabilizer and surface modifier.The optimum conditions to prepare CdTe QDs were investigated,and the resulting CdTe QDs were characterized with ultra-violet spectrophotometer,fluorescence spectrophotometer,and transmission electronic microscope,respectively.The results indicated that the optical properties of synthesized CdTe QDs were obviously dependent on the conditions of refluxing-time,mol ratio of n(Cd²⁺):n(HTe^-),concentration of reactant,amount of TGA,and the pH value of reaction system.The CdTe QDs with size of 5 nm in diameter were achieved when refluxing-time was 2 h,and which showed ideal optical properties of high photo-stability and narrow width of emission peak.

Key words: CdTe quantum dots, nanocrystals, surface modification, preparation and characterization

CLC Number:

XU Shi-chao, YAO Cui-cui, ZHANG Ji-mei, DAI Zhao, SUN Bo, ZHENG Guo, HAN Qing, HU Fei, ZHOU Hong-ming. Preparation and Optical Properties of A Surface Modified CdTe Quantum Dots[J]. Imaging Science and Photochemistry, 2009, 27(3): 161-167.

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Preparation and Optical Properties of A Surface Modified CdTe Quantum Dots

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