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

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.
Authors:
;  [1] ;  [2] ; ; ;  [1]
  1. Voronezh State University (Russian Federation)
  2. Moscow State University of Fine Chemical Technologies (Russian Federation)
Publication Date:
OSTI Identifier:
22470044
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 49; Journal Issue: 3; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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