Photochemistry and radiation chemistry of colloidal semiconductors. 23. Electron storage on ZnO particles and size quantization
Journal Article
·
· J. Phys. Chem.; (United States)
Improved methods for the preparation of colloidal ZnO solutions of different particle size are described, and the relation between absorption threshold and particle size is reported. CH/sub 2/OH radicals, radiolytically generated, transfer electrons to ZnO particles. The electrons are long-lived and cause a substantial blue shift of the absorption spectrum of ZnO in a wavelength range of 60 nm below the threshold. The wavelength of maximum bleaching is shifted to shorter wavelengths with decreasing particle size (size quantization effect). Maximum bleaching occurs with a negative absorption coefficient of 1.1 x 10/sup 5/ M/sup -1/ cm/sup -1/. Electrons are also stored upon UV illumination of colloidal ZnO. The stored electrons react rather slowly with oxygen, the rate constant becoming lower with increasing particle size, and more rapidly with peroxy radicals.
- Research Organization:
- Hahn-Meitner-Institut Berlin, Germany, F.R.
- OSTI ID:
- 5248636
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:2; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
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)
Photochemistry and radiation chemistry of semiconductor colloids. 27. Preparation of colloidal PbO sub 2 various electron-transfer processes
Photophysics and photochemistry of quantized ZnO colloids
Journal Article
·
Tue Feb 04 23:00:00 EST 1986
· J. Am. Chem. Soc.; (United States)
·
OSTI ID:5825969
Photochemistry and radiation chemistry of semiconductor colloids. 27. Preparation of colloidal PbO sub 2 various electron-transfer processes
Journal Article
·
Wed Mar 22 23:00:00 EST 1989
· Journal of Physical Chemistry; (USA)
·
OSTI ID:5143215
Photophysics and photochemistry of quantized ZnO colloids
Journal Article
·
Thu Aug 06 00:00:00 EDT 1992
· Journal of Physical Chemistry
·
OSTI ID:468102
Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400500 -- Photochemistry
400600* -- Radiation Chemistry
ABSORPTIVITY
ALCOHOLS
ALKOXY RADICALS
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COLLOIDS
DATA
DECOMPOSITION
DISPERSIONS
ELECTRON MICROSCOPY
ELECTRON TRANSFER
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
METHANOL
METHOXY RADICALS
MICROSCOPY
NUMERICAL DATA
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHYSICAL PROPERTIES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
SIZE
ZINC COMPOUNDS
ZINC OXIDES
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400500 -- Photochemistry
400600* -- Radiation Chemistry
ABSORPTIVITY
ALCOHOLS
ALKOXY RADICALS
CHALCOGENIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COLLOIDS
DATA
DECOMPOSITION
DISPERSIONS
ELECTRON MICROSCOPY
ELECTRON TRANSFER
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
METHANOL
METHOXY RADICALS
MICROSCOPY
NUMERICAL DATA
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHYSICAL PROPERTIES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
SIZE
ZINC COMPOUNDS
ZINC OXIDES