Spectroelectrochemical photoluminescence of titanium dioxide nanosheets and nanoparticles in aqueous and nonaqueous environments

Riley E. Rex; Fritz J. Knorr; Jeanne L. McHale

doi:10.1117/12.2063585

9 September 2014 Spectroelectrochemical photoluminescence of titanium dioxide nanosheets and nanoparticles in aqueous and nonaqueous environments

Riley E. Rex, Fritz J. Knorr, Jeanne L. McHale

Author Affiliations +

Proceedings Volume 9165, Physical Chemistry of Interfaces and Nanomaterials XIII; 91650T (2014) https://doi.org/10.1117/12.2063585
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

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.

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Riley E. Rex, Fritz J. Knorr, and Jeanne L. McHale "Spectroelectrochemical photoluminescence of titanium dioxide nanosheets and nanoparticles in aqueous and nonaqueous environments", Proc. SPIE 9165, Physical Chemistry of Interfaces and Nanomaterials XIII, 91650T (9 September 2014); https://doi.org/10.1117/12.2063585

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