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Subnanosecond Characteristics and Photophysics of Nanosized TiO2 Particulates from Rpart = 10 A to 134 A: Meaning for Heterogeneous Photocatalysis

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Book cover Fine Particles Science and Technology

Part of the book series: NATO ASI Series ((ASHT,volume 12))

Abstract

Three nanosized TiO2 clusters (Rpart = 10 A, 65 A, and 134 A), prepared by the arrested hydrolysis of TiCl4, had their photophysical properties assessed by absorption and photoluminescence spectroscopy and their subnanosecond characteristics determined by fast laser spectroscopy using 355 nm, 30-ps pulse excitation in the time window -50 ps to 10 ns. Direct and indirect electron transitions between energy levels in the Brillouin zone were observed and assigned for this indirect gap semiconductor. It is argued that for colloidal particles of TiO2 with 2Rpart = 20 A or greater there is no display of a size quantization effect. The subnanosecond transient spectra are composites of spectra of trapped electrons and trapped holes with trapping occurring in subpicosecond time (< 1–10 ps); as well, nearly 90% of the charge carriers have recombined by 1 ns. This has important consequences in heterogeneous photocatalyzed oxidations in the debate as to whether these oxidations implicate directly the valence band holes or the trapped holes, inferred earlier to be surface-bound •OH radicals. Quantum yields of these photoredox processes are therefore expected to be less than 10%.

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Author information

Authors and Affiliations

  1. Center for Fast Laser Spectroscopy, Department of Chemistry & Biochemistry, Concordia University, Montreal, Que., Canada

    N. Serpone & D. Lawless

  2. Dipartimento di ChimicaAnalitica, Universita di Torino, 10125, Torino, Italy

    E. Pelizzetti

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  1. N. Serpone
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  2. D. Lawless
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  3. E. Pelizzetti
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Editors and Affiliations

  1. Dipartimento di Chimica Analitica, Università di Torino, Torino, Italy

    Ezio Pelizzetti

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© 1996 Kluwer Academic Publishers

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Serpone, N., Lawless, D., Pelizzetti, E. (1996). Subnanosecond Characteristics and Photophysics of Nanosized TiO2 Particulates from Rpart = 10 A to 134 A: Meaning for Heterogeneous Photocatalysis. In: Pelizzetti, E. (eds) Fine Particles Science and Technology. NATO ASI Series, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0259-6_45

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  • DOI: https://doi.org/10.1007/978-94-009-0259-6_45

  • Publisher Name: Springer, Dordrecht

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