Hoffman, A. J. and Mills, G. and Yee, H. and Hoffmann, M. R. (1992) Q-sized cadmium sulfide: synthesis, characterization, and efficiency of photoinitiation of polymerization of several vinylic monomers. Journal of Physical Chemistry, 96 (13). pp. 5546-5552. ISSN 0022-3654. doi:10.1021/j100192a067. https://resolver.caltech.edu/CaltechAUTHORS:20150813-105951949
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Abstract
Q-sized CdS semiconductors have been synthesized in several nonaqueous solvents without the use of added stabilizers. The effects of solvent viscosity and dielectric strength, concentration of excess cadmium ions, temperature, and stirring upon the colloids' absorption spectra have been examined. In addition, efficiency of photoinitiation of polymerization of several vinylic monomers has been examined using both bulk and quantum-sized CdS, ZnO, and TiO_2. The Q-sized semiconductors demonstrated significantly higher quantum yields for photopolymerization than their bulk-sized counterparts. A correlation between the reactivity of a monomer toward polymerization and its Alfrey and Price Q and e values was observed. Hole scavenging by the solvent was necessary for efficient polymerization to occur. A correlation between the semiconductor photoinitation efficiency, and the reduction potential of its conduction band electrons was also found. On the basis of these observations, a mechanism of an anionic initiation step followed by free radical chain propagation steps has been proposed.
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| Additional Information: | © 1992 American Chemical Society. Received: November 20, 1991; In Final Form: March 10, 1992. Publication Date: June 1992. We are grateful to the du Pont Co., Photosystems and Electronic Products Department, for financial support, and we appreciate the assistance of Drs. Detlef Bahnemann and Berhan Tecle in the early stages of this research. | |||||||||
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| Issue or Number: | 13 | |||||||||
| DOI: | 10.1021/j100192a067 | |||||||||
| Record Number: | CaltechAUTHORS:20150813-105951949 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150813-105951949 | |||||||||
| Official Citation: | Q-sized cadmium sulfide: synthesis, characterization, and efficiency of photoinitiation of polymerization of several vinylic monomers A. J. Hoffman, G. Mills, H. Yee, and M. R. Hoffmann The Journal of Physical Chemistry 1992 96 (13), 5546-5552 DOI: 10.1021/j100192a067 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 59480 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Ruth Sustaita | |||||||||
| Deposited On: | 13 Aug 2015 22:37 | |||||||||
| Last Modified: | 10 Nov 2021 22:21 |
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