Abstract
Colloidal nanoparticles (NPs) of tetragonal β-In2S3 were stabilized in water and glycerol by mercaptoacetate anions. Doping of In2S3 NPs with AgI cations at the time of the synthesis imparts the NPs with the photoluminescence (PL) in the visible part of the spectrum. The doping results also in a shift of the absorption threshold and the PL band maximum to longer wavelengths proportional to the AgI content. The PL band maximum of AgI-doped In2S3 NPs can be varied from 575–580 to 760–765 nm by augmenting the silver(I) amount and the duration and temperature of the post-synthesis aging. The average radiative life-time of AgI-doped In2S3 NPs also depends on the silver(I) content and reaches the maximal value, 960 ns, at a molar Ag:In ratio of 1:4. The maximal quantum yield of stationary PL, 12 %, is observed at this Ag:In ratio as well. Deposition of a ZnS “shell” on the surface of AgI-doped In2S3 NPs results in an increase of the PL quantum yield to ~30 %.
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Acknowledgments
Authors thank Dr. I. Kotenko (L.V. Pysarzhevsky Institute of Physical Chemistry of NASU, Kyiv, Ukraine) and Dr. S. Schulze (Institute of Physics, Technical University of Chemnitz, Germany) for TEM and SAED results and M. Skoryk (LLC Nanomedtech, Kyiv, Ukraine) for SEM and EDX data. The financial support of State Fund for Fundamental Research of Ukraine (Project No. Ф53.3/019) and National Academy of Sciences of Ukraine (Joint Projects of NASU and Siberian Branch of RAS Nos 07-03-12 Ukr and 49-02-14(U)) is acknowledged.
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Raevskaya, A.E., Ivanchenko, M.V., Stroyuk, O.L. et al. Luminescent Ag-doped In2S3 nanoparticles stabilized by mercaptoacetate in water and glycerol. J Nanopart Res 17, 135 (2015). https://doi.org/10.1007/s11051-015-2953-1
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DOI: https://doi.org/10.1007/s11051-015-2953-1