Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/344926
Type: Artigo
Title: Time-resolved X-ray powder diffraction study of photoinduced phase transitions in Ti3O5 nanoparticles
Author: Tasca, K. R.
Esposito, V.
Lantz, G.
Beaud, P.
Kubli, M.
Savoini, M.
Giles, C.
Johnson, S. L.
Abstract: Nanoparticles of Ti3O5 have been reported to show a permanent photoinduced phase transition at room temperature. This suggests that light-induced phase transformations of Ti3O5 nanoparticles may be promising for technological applications. Here, we report a photoinduced semiconductor-to-metal phase transition from beta-Ti3O5 to lambda-Ti3O5 nanoparticles at room temperature observed directly by time-resolved X-ray powder diffraction in a pump-probe setup. The results show a partial structural change, limited by differences between pumped and probed volumes, which persists a few microseconds after excitation. The first step in the relaxation back to the ground state can be described by a single exponential decay with time constant within microsecond timescales. Analysis of the change in lattice constants enables us to estimate an average temperature increase across the phase transition, consistent with a thermally driven process.
Subject: Nanopartículas
Raios X - Difração
Transição de fase
Nanoparticles
X-rays - Diffraction
Phase transition
Country: Alemanha
Editor: Wiley-VCH Verlag
Rights: fechado
Identifier DOI: 10.1002/cphc.201601337
Address: https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/cphc.201601337
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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