Photochemistry and radiation chemistry of colloidal semiconductors. 12. Intermediates of the oxidation of extremely small particles of CdS, ZnS, and Cd/sub 3/P/sub 2/ and size quantization effects (a pulse radiolysis study)

Journal Article · Wed Feb 05 04:00:00 EST 1986 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00263a005· OSTI ID:5825969

Baral, S; Fojtik, A; Weller, H; Henglein, A

The reactions of hydroxyl radicals with colloidal Q-CdS, Q-ZnS, and Q-Cd/sub 3/P/sub 2/ (materials of extremely small particle size showing optical size quantization effects) were studied pulse radiolytically. The radicals attack the particles at diffusion-controlled rates. In all three cases, a product with a broad absorption band in the visible (sulfides) or near-infrared (phosphide) is formed. This band shifts to shorter wavelengths with decreasing particle size (size quantization effect). It is attributed to surface trapped holes. These holes react with dissolved oxygen. The colloidal particles become a little smaller by OH attack. With use of a CdS sample with a structured absorption spectrum, it is shown that the product particles have their absorption maxima at slightly shorter wavelengths than the reactant particles (size quantization effect). 18 references, 7 figures, 1 table.

• Research Organization: Hahn-Meitner-Institut fuer Kernforschung Berlin, West Germany
• OSTI ID: 5825969
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 108:3; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400500* -- Photochemistry
400600 -- Radiation Chemistry
ABSORPTION SPECTROSCOPY
CADMIUM COMPOUNDS
CADMIUM PHOSPHIDES
CADMIUM SULFIDES
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COLLOIDS
DATA
DECOMPOSITION
DIFFUSION
DISPERSIONS
EXPERIMENTAL DATA
HALF-LIFE
HYDROXYL RADICALS
INFORMATION
INORGANIC PHOSPHORS
MATERIALS
NUMERICAL DATA
OXIDATION
PARTICLE SIZE
PHOSPHIDES
PHOSPHORS
PHOSPHORUS COMPOUNDS
PHOTOCHEMICAL REACTIONS
PNICTIDES
PULSE TECHNIQUES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION INTERMEDIATES
SEMICONDUCTOR MATERIALS
SIZE
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
ZINC COMPOUNDS
ZINC SULFIDES