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Proceedings Paper

Spectroelectrochemical photoluminescence of titanium dioxide nanosheets and nanoparticles in aqueous and nonaqueous environments
Author(s): Riley E. Rex; Fritz J. Knorr; Jeanne L. McHale
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Paper Abstract

Spectroelectrochemical photoluminescence (SEPL) is used to investigate surface electron and hole traps on anatase nanoparticles, anatase nanosheets and rutile nanowires in aqueous and nonaqueous environments. In aqueous environment there is an overvoltage for occupying surface electron traps in rutile and anatase samples. For anatase, this overvoltage is larger on (101) nanoparticles than on (001) nanosheets. The electrochemical energy levels of electron traps determined by SEPL in acetonitrile are consistent with emitted photon energies as determined by the photoluminescence spectrum. Our results show how the contacting solvent and particle morphology can influence the redox potential of surface electron traps and thus guide further research on improving the performance of nano- TiO2 in applications such as dye–sensitized solar cells and solar water splitting.

Paper Details

Date Published: 9 September 2014
PDF: 8 pages
Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 91650T (9 September 2014); doi: 10.1117/12.2063585
Show Author Affiliations
Riley E. Rex, Washington State Univ. (United States)
Fritz J. Knorr, Washington State Univ. (United States)
Jeanne L. McHale, Washington State Univ. (United States)

Published in SPIE Proceedings Vol. 9165:
Physical Chemistry of Interfaces and Nanomaterials XIII
Natalie Banerji; Sophia C. Hayes; Carlos Silva, Editor(s)

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