Photoexcited charge carrier dynamics of interconnected TiO2 nanoparticles: evidence of enhancement of charge separation at anatase–rutile particle interfaces. Issue 5 (16th January 2018)

• Record Type: Journal Article
• Authors: Shingai, Daiki; Ide, Yusuke; Sohn, Woon Yong; Katayama, Kenji
• Is Part Of: Physical chemistry chemical physics. Volume 20:Issue 5(2018)
• Page Start: 3484
• Page End: 3489
• Publication Date: 2018-01-16
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c7cp07563d
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : Hydrothermal treatment can improve the charge separation efficiency of P25. Abstract : The charge carrier kinetics of hydrothermally treated TiO2 nanoparticles, consisting of interconnected anatase and rutile crystallographic forms, was investigated using a heterodyne transient grating technique to obtain direct evidence of the enhancement of charge separation efficiency. We found that surface recombination arising from trapped electrons was retarded, compared with that of P25 TiO2 nanoparticles, with the aid of an increase of particle interfaces. This means that the charge separation efficiency of hydrothermally treated TiO2 nanoparticles is higher than that of P25 TiO2 nanoparticles, to which the enhanced photocatalytic performance of the hydrothermally treated TiO2 nanoparticles could be attributed.