Berichte der Bunsengesellschaft für physikalische Chemie, volume 88, issue 7, pages 649-656

Photochemistry of Colloidal Metal Sulfides. 7. Absorption and Fluorescence of Extremely Small ZnS Particles (The World of the Neglected Dimensions)

H. Weller
U. Koch
M. Gutiérrez
A. Henglein
Publication typeJournal Article
Publication date1984-07-01
Quartile SCImago
Quartile WOS
Impact factor
ISSN00059021, 00059021
General Chemical Engineering
Abstract
Extremely small colloidal ZnS particles (diameter ∼ 1.7 nm) were made by either photo-degradation of 3 nm particles or rapid precipitation in phosphate containing solution at pH = 7-−8. The absorption spectra of these particles are different from that of macrocrystalline ZnS, and the changes are regarded as an indication for the transition from semiconductor ZnS to polymolecular ZnS with decreasing particle size. – The dependence of the intensity of the fluorescence on particle size, temperature, photoanodic corrosion and the quenching of fluorescence were investigated for colloids on a silicon dioxide carrier, in phosphate solution, and without a stabilizer. Photo-anodic corrosion strongly improves the fluorescence properties. – One adsorbed Cd2+ ion per colloidal particle is sufficient for efficient quenching of the fluorescence. However, a new fluorescence band appears which is explained by the formation of a layer of 1:1 co-colloid at the surface of the ZnS particles. – Methylviologen was also found to be a very efficient quencher. The decay of the fluorescence is wavelength dependent, i.e. the fraction of long-lived fluorescence is greater at longer wavelengths. – A mechanism is discussed, where the fluorescence centers are anion vacancies, and fluorescence is emitted when electrons trapped in states of different energies and exhibiting different life-times tunnel to the localized positive holes.

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Weller H. et al. Photochemistry of Colloidal Metal Sulfides. 7. Absorption and Fluorescence of Extremely Small ZnS Particles (The World of the Neglected Dimensions) // Berichte der Bunsengesellschaft für physikalische Chemie. 1984. Vol. 88. No. 7. pp. 649-656.
GOST all authors (up to 50) Copy
Weller H., Koch U., Gutiérrez M., Henglein A. Photochemistry of Colloidal Metal Sulfides. 7. Absorption and Fluorescence of Extremely Small ZnS Particles (The World of the Neglected Dimensions) // Berichte der Bunsengesellschaft für physikalische Chemie. 1984. Vol. 88. No. 7. pp. 649-656.
RIS |
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RIS Copy
TY - JOUR
DO - 10.1002/bbpc.19840880715
UR - https://doi.org/10.1002/bbpc.19840880715
TI - Photochemistry of Colloidal Metal Sulfides. 7. Absorption and Fluorescence of Extremely Small ZnS Particles (The World of the Neglected Dimensions)
T2 - Berichte der Bunsengesellschaft für physikalische Chemie
AU - Weller, H.
AU - Koch, U.
AU - Gutiérrez, M.
AU - Henglein, A.
PY - 1984
DA - 1984/07/01 00:00:00
PB - Wiley
SP - 649-656
IS - 7
VL - 88
SN - 0005-9021
SN - 0005-9021
ER -
BibTex |
Cite this
BibTex Copy
@article{1984_Weller,
author = {H. Weller and U. Koch and M. Gutiérrez and A. Henglein},
title = {Photochemistry of Colloidal Metal Sulfides. 7. Absorption and Fluorescence of Extremely Small ZnS Particles (The World of the Neglected Dimensions)},
journal = {Berichte der Bunsengesellschaft für physikalische Chemie},
year = {1984},
volume = {88},
publisher = {Wiley},
month = {jul},
url = {https://doi.org/10.1002/bbpc.19840880715},
number = {7},
pages = {649--656},
doi = {10.1002/bbpc.19840880715}
}
MLA
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MLA Copy
Weller, H., et al. “Photochemistry of Colloidal Metal Sulfides. 7. Absorption and Fluorescence of Extremely Small ZnS Particles (The World of the Neglected Dimensions).” Berichte der Bunsengesellschaft für physikalische Chemie, vol. 88, no. 7, Jul. 1984, pp. 649-656. https://doi.org/10.1002/bbpc.19840880715.
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