Bandgap narrowing of titanium oxide nanosheets: homogeneous doping of molecular iodine for improved photoreactivity

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	Bandgap narrowing of titanium oxide nanosheets: homogeneous doping of molecular iodine for improved photoreactivity
	G. Liu; C. H. Sun; L. Z. Wang; S. C. Smith; G. Q. Lu; H. M. Cheng
	2011
发表期刊	Journal of Materials Chemistry
ISSN	0959-9428
卷号	21 期号:38 页码:14672-14679
摘要	We developed a new strategy for homogeneous doping of iodine molecules (I(2)) to achieve bandgap narrowing of semiconducting metal oxide nanosheets. This was realized by electrostatic interactions between nonpolar I(2) molecules and negatively charged exfoliated metal oxide nanosheets, mediated by the partial polarizability of the molecular iodine. Flocculated titania nanosheets doped with I(2) molecules (I(2)-Ti(0.91)O(2) sheets) were explored as a model system to demonstrate the effectiveness of this strategy. We observed an extension of the intrinsic absorption edge into the visible light region through a shifting of the valence band maximum at high doping levels of I(2) molecules. Importantly, at the same time the geometric structure of the host retained its integrity. The experimental together with first-principles calculations reveal the molecular nature of adsorbed iodine atoms and imply that the mechanism of electronic structure modulation in the titania layers changes depending on the concentration of I(2) molecules. This simple and efficient strategy may be suitable for other charged metal oxide nanosheets with large bandgaps to facilitate the design of new functional materials.
部门归属	[liu, gang; sun, chenghua; wang, lianzhou; lu, gao qing (max)] univ queensland, arc ctr excellence funct nanomat, sch chem engn, brisbane, qld 4072, australia. [liu, gang; sun, chenghua; wang, lianzhou; lu, gao qing (max)] univ queensland, australian inst bioengn & nanotechnol, brisbane, qld 4072, australia. [liu, gang; cheng, hui-ming] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [sun, chenghua; smith, sean c.] univ queensland, australia inst bioengn & nanotechnol, ctr computat mol sci, brisbane, qld 4072, australia.;lu, gq (reprint author), univ queensland, arc ctr excellence funct nanomat, sch chem engn, brisbane, qld 4072, australia;maxlu@uq.edu.au cheng@imr.ac.cn
关键词	Visible-light Photocatalysis Doped Tio2 Surface Science Tantalum Oxide Photoactivity Dioxide Anatase Degradation Irradiation Mechanisms
URL	查看原文
WOS记录号	WOS:000295101000050
引用统计	被引频次：27[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30516
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. Liu,C. H. Sun,L. Z. Wang,et al. Bandgap narrowing of titanium oxide nanosheets: homogeneous doping of molecular iodine for improved photoreactivity[J]. Journal of Materials Chemistry,2011,21(38):14672-14679.
APA	G. Liu,C. H. Sun,L. Z. Wang,S. C. Smith,G. Q. Lu,&H. M. Cheng.(2011).Bandgap narrowing of titanium oxide nanosheets: homogeneous doping of molecular iodine for improved photoreactivity.Journal of Materials Chemistry,21(38),14672-14679.
MLA	G. Liu,et al."Bandgap narrowing of titanium oxide nanosheets: homogeneous doping of molecular iodine for improved photoreactivity".Journal of Materials Chemistry 21.38(2011):14672-14679.