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Controlled nanophase development in photocatalytic titania

Ying, Li; Hon, Lim; White, Tim; Withers, Raymond; Hai, Liu

Description

Acid catalyzed hydrolysis of titanium butoxide was used to synthesize homogeneous titania gels, which were converted to the anatase and rutile polytypes through controlled firing. The mechanism of this phase transformation was investigated by quantitative powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Condensation to titania is a function of annealing time, temperature and atmosphere. In air, calcinations below 600°C favored the formation of...[Show more]

dc.contributor.authorYing, Li
dc.contributor.authorHon, Lim
dc.contributor.authorWhite, Tim
dc.contributor.authorWithers, Raymond
dc.contributor.authorHai, Liu
dc.date.accessioned2015-12-13T23:12:01Z
dc.date.available2015-12-13T23:12:01Z
dc.identifier.issn1345-9678
dc.identifier.urihttp://hdl.handle.net/1885/87855
dc.description.abstractAcid catalyzed hydrolysis of titanium butoxide was used to synthesize homogeneous titania gels, which were converted to the anatase and rutile polytypes through controlled firing. The mechanism of this phase transformation was investigated by quantitative powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Condensation to titania is a function of annealing time, temperature and atmosphere. In air, calcinations below 600°C favored the formation of anatase, with rutile only appearing at >600°C. However, in situ transformation where titania nanoparticles were treated under vacuum in the TEM required heating at higher temperatures up to 900°C. This is may be due to the formation of surface layers of reduced titanium oxide that passivate and retard the anatase to rutile transformation. Grain growth and specific surface area varied inversely, with especially rapid crystallization observed at and beyond the transformation temperature. Potential photocatalytic activity was identified with ultraviolet-visible (UV-Vis) spectroscopy. A red shift of the absorption edge for nano-titania was observed due to quantum size effects.
dc.publisherJapan Institute of Metals
dc.sourceMaterials Transactions
dc.subjectKeywords: Annealing; Calcination; Catalysis; High resolution electron microscopy; Hydrolysis; Nanostructured materials; Phase transitions; Photochemical reactions; Thermal effects; Transmission electron microscopy; Ultraviolet spectroscopy; X ray powder diffraction Catalyst; Nanoparticles; Photoreactivity; Sol gel processing; Titania polytypes
dc.titleControlled nanophase development in photocatalytic titania
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume44
dc.date.issued2003
local.identifier.absfor030206 - Solid State Chemistry
local.identifier.absfor020404 - Electronic and Magnetic Properties of Condensed Matter; Superconductivity
local.identifier.ariespublicationMigratedxPub17321
local.type.statusPublished Version
local.contributor.affiliationYing, Li, Nanyang Technological University
local.contributor.affiliationHon, Lim, Nanyang Technological University
local.contributor.affiliationWhite, Tim, Nanyang Technological University
local.contributor.affiliationWithers, Raymond, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationHai, Liu, National University of Singapore
local.bibliographicCitation.issue7
local.bibliographicCitation.startpage1328
local.bibliographicCitation.lastpage1332
local.identifier.absseo970103 - Expanding Knowledge in the Chemical Sciences
dc.date.updated2015-12-12T08:30:03Z
local.identifier.scopusID2-s2.0-0043284917
CollectionsANU Research Publications

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