DICP OpenIR
UV Raman spectroscopic study on TiO2. I. Phase transformation at the surface and in the bulk
Zhang, J; Li, MJ; Feng, ZC; Chen, J; Li, C; Li C(李灿)
Source PublicationJOURNAL OF PHYSICAL CHEMISTRY B
2006-01-19
DOI10.1021/jp0552473
Volume110Issue:2Pages:927-935
Indexed BySCI
SubtypeArticle
Department5
Funding Project503
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Physical
WOS Research AreaChemistry
WOS KeywordANATASE-TO-RUTILE ; NANOCRYSTALLINE TITANIA ; PHOTOCATALYTIC ACTIVITY ; GRAIN-GROWTH ; POWDERS ; WATER ; KINETICS ; CALCINATION ; EVOLUTION ; DIOXIDE
AbstractPhase transformation of TiO2 from anatase to rutile is studied by UV Raman spectroscopy excited by 325 and 244 nm lasers, visible Rainan spectroscopy excited by 532 nm laser, X-ray diffraction (XRD), and transmission electron microscopy (TEM). UV Raman spectroscopy is found to be more sensitive to the surface region of TiO2 than visible Raman spectroscopy and XRD because TiO2 strongly absorbs UV light. The anatase phase is detected by UV Raman spectroscopy for the sample calcined at higher temperatures than when it is detected by visible Raman spectroscopy and XRD. The inconsistency in the results from the above three techniques suggests that the anatase phase of TiO2 at the surface region can remain at relatively higher calcination temperatures than that in the bulk during the phase transformation. The TEM results show that small particles agglomerate into big particles when the TiO2 sample is calcined at elevated temperatures and the agglomeration of the TiO2 particles is along with the phase transformation from anatase to rutile. It is suggested that the rutile phase starts to form at the interfaces between the anatase particles in the agglomerated TiO2 particles; namely, the anatase phase in the inner region of the agglomerated TiO2 particles turns out to change into the rutile phase more easily than that in the outer surface region of the agglomerated TiO2 particles. When the anatase particles of TiO2 are covered with highly dispersed La2O3, the phase transformation in both the bulk and surface regions is significantly retarded, owing to avoiding direct contact of the anatase particles and occupying the surface defect sites of the anatase particles by La2O3.
Language英语
URL查看原文
WOS IDWOS:000234699200046
Citation statistics
Cited Times:627[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/98231
Collection中国科学院大连化学物理研究所
Corresponding AuthorLi C(李灿)
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Zhang, J,Li, MJ,Feng, ZC,et al. UV Raman spectroscopic study on TiO2. I. Phase transformation at the surface and in the bulk[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2006,110(2):927-935.
APA Zhang, J,Li, MJ,Feng, ZC,Chen, J,Li, C,&李灿.(2006).UV Raman spectroscopic study on TiO2. I. Phase transformation at the surface and in the bulk.JOURNAL OF PHYSICAL CHEMISTRY B,110(2),927-935.
MLA Zhang, J,et al."UV Raman spectroscopic study on TiO2. I. Phase transformation at the surface and in the bulk".JOURNAL OF PHYSICAL CHEMISTRY B 110.2(2006):927-935.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhang, J]'s Articles
[Li, MJ]'s Articles
[Feng, ZC]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhang, J]'s Articles
[Li, MJ]'s Articles
[Feng, ZC]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhang, J]'s Articles
[Li, MJ]'s Articles
[Feng, ZC]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.