TY - JOUR

T1 - Laser-flash-photolysis-spectroscopy

T2 - A nondestructive method?

AU - Schneider, Jenny

AU - Nikitin, Konstantin

AU - Dillert, Ralf

AU - Bahnemann, Detlef W.

PY - 2017

Y1 - 2017

N2 - Herein, we report the effect of the laser illumination during the diffuse-reflectance laser-flash-photolysis measurements on the morphological and optical properties of TiO2 powders. A grey-blue coloration of the TiO2 nanoparticles has been observed after intense laser illumination. This is explained by the formation of nonreactive trapped electrons accompanied by the release of oxygen atoms from the TiO2 matrix as detected by means of UV-vis and EPR spectroscopy. Moreover, in the case of the pure anatase sample a phase transition of some TiO2 nanoparticles located in the inner region from anatase to rutile occurred. It is suggested that these structural changes in TiO2 are caused by an energy and charge transfer to the TiO2 lattice.

AB - Herein, we report the effect of the laser illumination during the diffuse-reflectance laser-flash-photolysis measurements on the morphological and optical properties of TiO2 powders. A grey-blue coloration of the TiO2 nanoparticles has been observed after intense laser illumination. This is explained by the formation of nonreactive trapped electrons accompanied by the release of oxygen atoms from the TiO2 matrix as detected by means of UV-vis and EPR spectroscopy. Moreover, in the case of the pure anatase sample a phase transition of some TiO2 nanoparticles located in the inner region from anatase to rutile occurred. It is suggested that these structural changes in TiO2 are caused by an energy and charge transfer to the TiO2 lattice.

UR - http://www.scopus.com/inward/record.url?scp=85021723205&partnerID=8YFLogxK

U2 - 10.1039/c6fd00193a

DO - 10.1039/c6fd00193a

M3 - Article

AN - SCOPUS:85021723205

VL - 197

SP - 505

EP - 516

JO - Faraday Discussions

JF - Faraday Discussions

SN - 1364-5498

ER -