Photochemistry of colloidal metal sulfides. 3. Photoelectron emission from CdS and CdS-ZnS co-colloids
- authored by
- Z. Alfassi, D. Bahnemann, A. Henglein
- Abstract
Hydrated electrons are formed in the illumination of a CdS colloid and of ZnS/CdS co-colloids with a 347.2-nm laser flash. The yield is increased by excess sulfide anions. In the presence of 2 × 10-3 M Na2S, the quantum yield is 0.15 hydrated electrons per absorbed photon. The photoelectron emission from the colloids shows the intensity dependence of a monophotonic process. A mechanism is proposed in which the storage of a huge number of electrons for a short time after scavenging of positive holes by sulfide anions plays an important role. The accompanying cathodic potential changes enable part of the electrons to migrate from the colloidal particles into the aqueous phase.
- External Organisation(s)
-
Helmholtz-Zentrum Berlin für Materialien und Energie (HZB)
Ben-Gurion University of the Negev
- Type
- Article
- Journal
- Journal of Physical Chemistry
- Volume
- 86
- Pages
- 4656-4657
- No. of pages
- 2
- ISSN
- 0022-3654
- Publication date
- 1982
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Engineering(all), Physical and Theoretical Chemistry
- Electronic version(s)
-
https://doi.org/10.1021/j100221a002 (Access:
Unknown)
