4 January 2019 Mn2+ and Cu2+-doped ZnS quantum dots stabilized by N-(2-carboxyethyl)chitosans
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Proceedings Volume 11024, Asia-Pacific Conference on Fundamental Problems of Opto- and Microelectronics 2017; 110240C (2019) https://doi.org/10.1117/12.2315173
Event: Asia-Pacific Conference on Fundamental Problems of Opto- and Microelectronics 2017, 2017, Taipei, Taiwan
Abstract
Here, we report a green synthesis of ZnS and Mn2+ and Cu2+-doped ZnS quantum dots (QDs) stabilized with polyampholyte chitosan derivatives – N-(2-carboxyethyl)chitosans (CEC) varying in the degree of substitution (DS). It has been shown that the fabricated ZnS nanoparticles have spherical shapes and low polydispersity. The average size determined by means of transmission electron microscopy was 2.2±0.2nm and 3.6±0.6nm for CEC with DS 0.7 and 1.0, respectively. ZnS QDs showed only one sharp emission peak in the UV range (~370 nm) related to the sulfur vacancies. Photoluminecent spectra of ZnS doped with Mn2+ and Cu2+ showed emission peaks at 599 nm and 383-395 nm, respectively. A significant increase of the luminescence intensity was observed for Zn:CuS QDs incubated at 80°C. The metal:S ratio is slightly higher than the stoichiometric-favored one for formation of brighter Zn:MnS QDs.
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Yu. Privar, A. Nazirov, A. Pestov, E. Modin, A. Mironenko, and S. Bratskaya "Mn2+ and Cu2+-doped ZnS quantum dots stabilized by N-(2-carboxyethyl)chitosans", Proc. SPIE 11024, Asia-Pacific Conference on Fundamental Problems of Opto- and Microelectronics 2017, 110240C (4 January 2019); doi: 10.1117/12.2315173; https://doi.org/10.1117/12.2315173
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