Enhanced visible‐light activity of Ti3+ self‐doped TiO2 with co‐exposed {001} and {101} facets. (1st April 2018)

• Record Type: Journal Article
• Authors: Li, Junqi; Niu, Lijun; He, Xuanmeng
• Is Part Of: Micro & nano letters. Volume 13:Number 4(2018)
• Page Start: 514
• Page End: 517
• Publication Date: 2018-04-01
• Subjects: semiconductor materials -- semiconductor growth -- nanostructured materials -- nanofabrication -- titanium -- titanium compounds -- X‐ray diffraction -- transmission electron microscopy -- X‐ray photoelectron spectra -- reflectivity -- catalysis -- photochemistry -- energy gap -- vacancies (crystal) -- visible spectra -- ultraviolet spectra; visible‐light activity -- coexposed {001} crystalline facets -- self‐doped titanium dioxide nanosheets -- one‐step solvent thermal method -- X‐ray diffraction -- transmission electron microscopy -- X‐ray photoelectron spectroscopy -- diffuse reflectance spectroscopy -- anatase structure -- XPS -- band gap -- photocatalytic activity -- {101} crystalline facet -- photogenerated electron‐hole pair separation efficiency -- oxygen vacancy -- visible absorption -- TiO2:Ti; Nanotechnology -- Periodicals; Nanostructures -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1049/mnl.2017.0642
• Languages: English
• ISSNs: 1750-0443

Abstract

Abstract : The Ti 3+ self‐doped titanium dioxide (TiO2 ) nanosheets with co‐exposed {001} and {101} facets were successfully synthesised by the one‐step solvent thermal method. The as‐prepared samples were characterised by X‐ray diffraction, transmission electron microscopy, X‐ray photoelectron spectroscopy (XPS) and diffuse reflectance spectroscopy. The results showed that the Ti 3+ self‐doped TiO2 nanosheets with anatase structure exposed {001} and {101} facets. XPS spectra confirmed Ti 3+ were self‐doped TiO2 nanosheets, and which narrowed the band gap of TiO2 . Comparing to bare TiO2, the Ti 3+ self‐doped TiO2 nanosheets exhibited excellent photocatalytic activities. The reasons were that the co‐exposed {001} and {101} crystalline facet effectively improved the separation efficiency of photogenerated electron–hole pairs, and the existence of Ti 3+ and oxygen vacancy resulted in a narrowing band gap and enhancing visible absorption.