Photoinduced Degradation of the Optical Properties of Colloidal Ag{sub 2}S and CdS Quantum Dots Passivated by Thioglycolic Acid

Journal Article · Tue May 15 00:00:00 EDT 2018 · Optics and Spectroscopy

DOI:https://doi.org/10.1134/S0030400X18050211· OSTI ID:22786452

Smirnov, M. S.; Grevtseva, I. G.; Zvyagin, A. I.; Perepelitsa, A. S.; Ganeev, R. A. ^[1]

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1. Voronezh State University (Russian Federation)

The results of studying degradation of the optical properties of colloidal Ag{sub 2}S and CdS quantum dots (QDs) 2.6–3.2 nm in size passivated by thioglycolic acid (TGA) are presented. The photoluminescence intensity of colloidal Ag{sub 2}S QDs has been found to decrease under laser irradiation at a wavelength of 445 nm, beginning with the effective power of 10 mW. The observed effect is interpreted as a photochemical reaction of formation of new nonradiative-recombination channels in Ag{sub 2}S QDs upon excitation. It is established for colloidal CdS QDs passivated by TGA that a decrease in the optical density in the entire absorption spectrum and the luminescence intensity is accompanied by precipitation of the colloidal particles in a cell and related to photodegradation of the passivating shell.

• OSTI ID: 22786452
• Journal Information: Optics and Spectroscopy, Journal Name: Optics and Spectroscopy Journal Issue: 5 Vol. 124; ISSN 0030-400X; ISSN OPSUA3
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ABSORPTION SPECTRA
CADMIUM SULFIDES
EXCITATION
LASER RADIATION
OPACITY
PHOTOCHEMICAL REACTIONS
PHOTOLUMINESCENCE
PRECIPITATION
QUANTUM DOTS
RECOMBINATION
SILVER SULFIDES
THERMAL GRAVIMETRIC ANALYSIS
WAVELENGTHS