TiO2 with super narrow bandgap achieved in one-step single-mode magnetic microwave induced plasma treatment. (1st March 2020)

• Record Type: Journal Article
• Authors: Kato, Kunihiko; Xin, Yunzi; Shirai, Takashi
• Is Part Of: Scripta materialia. Number 177(2020)
• Page Start: 157
• Page End: 161
• Publication Date: 2020-03-01
• Subjects: Tio2 -- Deficient -- Photocatalyst -- Plasma-treatment -- Microwave; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.10.021
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: TiO2 with super narrow bandgap (1.1 eV∼) are successfully synthesized via a facile and novel one-step single-mode magnetic microwave induced plasma treatment. The selectively surface Ti 3+ -doping on obtained TiO2 as trapping centers which significantly restrain the photo-excited carrier recombination and achieve the enhancement of visible-light photocatalytic performance. In addition, the surface chemical composition of TiOx is precisely controlled in a wide region of 1.19 < x < 1.92 during one-step reaction. A detailed XPS analysis reveals that the surface formed Ti 3+ shows highly thermal/chemical stability even through high-temperature treatment (∼800 °C) in oxidative atmosphere and photocatalytic reaction. Graphical abstract: Image, graphical abstract