Optical and structural properties of ensembles of colloidal Ag{sub 2}S quantum dots in gelatin

Journal Article · Sun Mar 15 00:00:00 EDT 2015 · Semiconductors

DOI:https://doi.org/10.1134/S1063782615030173· OSTI ID:22470044

Smirnov, M. S. ^[1]; Shapiro, B. I. ^[2]; Shatskikh, T. S.; Perepelitsa, A. S.; Korolev, N. V. ^[1]

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1. Voronezh State University (Russian Federation)
2. Moscow State University of Fine Chemical Technologies (Russian Federation)

The size dependences of the absorption and luminescence spectra of ensembles of hydrophilic colloidal Ag{sub 2}S quantum dots produced by the sol-gel method and dispersed in gelatin are analyzed. By X-ray diffraction analysis and transmission electron microscopy, the formation of core/shell nanoparticles is detected. The characteristic feature of the nanoparticles is the formation of crystalline cores, 1.5–2.0 nm in dimensions, and shells of gelatin and its complexes with the components of synthesis. The observed slight size dependence of the position of infrared photoluminescence bands (in the range 1000–1400 nm) in the ensembles of hydrophilic colloidal Ag{sub 2}S quantum dots is explained within the context of the model of the radiative recombination of electrons localized at structural and impurity defects with free holes.

• OSTI ID: 22470044
• Journal Information: Semiconductors, Vol. 49, Issue 3; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION
ABSORPTION SPECTRA
COLLOIDS
ELECTRONS
EMISSION SPECTRA
GELATIN
HOLES
NANOPARTICLES
PHOTOLUMINESCENCE
QUANTUM DOTS
RECOMBINATION
SILVER SULFIDES
SOL-GEL PROCESS
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION