Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9775314 | Materials Science and Engineering: C | 2005 | 5 Pages |
Abstract
Two types of nanostructured TiO2 electrodes were prepared without rutile-type (100% anatase-type) and with rutile-type (12%) content. CdSe quantum dots (QDs) were adsorbed onto each of the two types of TiO2 electrodes using a chemical deposition (CD) technique. Optical absorption and photoelectrochemical properties were characterized with photoacoustic (PA) and photoelectrochemical current (PEC) methods. The redshift of the PA and PEC spectra with increasing CdSe sizes were clearly observed, indicating quantum confinement effects and photosensitization. It was found that the PA and PEC spectra in the visible region were different for the two types of TiO2 electrodes for the same deposition time. The PA and PEC intensities of TiO2 electrodes with rutile-type content were larger than those without rutile-type content, indicating that adsorbed CdSe QDs in the TiO2 electrodes with rutile-type content might be higher than those without rutile-type content. Moreover, the transport properties in the TiO2 electrodes with rutile-type content might be improved. These results suggest that the rutile-type content is advantageous to increase the photoelectrochemical properties of TiO2 electrodes.
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Authors
Taro Toyoda, Ikumi Tsuboya, Qing Shen,