We present an experimental study of the radiative recombination dynamics in size-controlled anatase TiO2 nanoparticles in the range 20–130 nm. From time-integrated photoluminescence spectra and picosecond time-resolved experiments as a function of the nanoparticle size, excitation density, and temperature, we show that photoluminescence comes out from a bulk and a surface radiative recombination. The spectral shift and the different time dynamics provide a clear distinction between them. Moreover, the intrinsic nature of the emission is also proven, providing a quantitative evaluation of volume and surface contributions.

Volume versus surface-mediated recombination in anatase TiO2 nanoparticles / L. Cavigli; F. Bogani; A. Vinattieri; V. Faso; G. Baldi. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - STAMPA. - 106:(2009), pp. 053516-1-053516-8. [10.1063/1.3211291]

Volume versus surface-mediated recombination in anatase TiO2 nanoparticles

CAVIGLI, LUCIA;BOGANI, FRANCO;VINATTIERI, ANNA
Supervision
;
2009

Abstract

We present an experimental study of the radiative recombination dynamics in size-controlled anatase TiO2 nanoparticles in the range 20–130 nm. From time-integrated photoluminescence spectra and picosecond time-resolved experiments as a function of the nanoparticle size, excitation density, and temperature, we show that photoluminescence comes out from a bulk and a surface radiative recombination. The spectral shift and the different time dynamics provide a clear distinction between them. Moreover, the intrinsic nature of the emission is also proven, providing a quantitative evaluation of volume and surface contributions.
106
053516-1
053516-8
L. Cavigli; F. Bogani; A. Vinattieri; V. Faso; G. Baldi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2158/361813
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