✦ LIBER ✦

Photosensitized charge injection into TiO2 particles as studied by microwave absorption

✍ Scribed by Richard W. Fessenden; Prashant V. Kamat

Book ID: 103023700
Publisher: Elsevier Science
Year: 1986
Tongue: English
Weight: 627 KB
Volume: 123
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(86)80020-3

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✦ Synopsis

The fluorescence of rose bengal is quenched with 96% efficiency when thrs dye is adsorbed on TiO, parttcles. Microwave measurements on suspensrons of these dye-coated particles have shown large absorption signals when the suspension is irradiated with pulses of 532 nm light from a laser. The microwave absorption is attributed to mobile charge carriers injected into the TiO, from the excited singlet state of the dye. The observed rise time of the signal indicates no intermedtate surface state of greater than 2 ns lifetime. Various characteristics of the observed signals are compared with those from TiO, single crystals.

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