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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 27 — Dec. 17, 2012
  • pp: 28801–28807

Indirect optical transitions in hybrid spheres with alternating layers of titania and graphene oxide nanosheets

Shanshan Bao, Zheng Hua, Xiaoyong Wang, Yong Zhou, Chunfeng Zhang, Wenguang Tu, Zhigang Zou, and Min Xiao  »View Author Affiliations


Optics Express, Vol. 20, Issue 27, pp. 28801-28807 (2012)
http://dx.doi.org/10.1364/OE.20.028801


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Abstract

In this report, we studied the optical properties of hybrid spherical structures consisting of alternating nanosheets of titania (TiO2) and graphene oxide (GO) prepared by a layer-by-layer self-assembly technique. Compared to samples with only TiO2 spheres or GO nanosheets, a blue-to-red light emission band emerges and persists in this novel composite material even after it was further reduced through microwave irradiation. From detailed time-resolved measurements and energy-level structure modeling, this unexpected fluorescent feature was attributed to the indirect optical transitions between TiO2 and the localized sp2 domains of GO in a charge-separated configuration.

© 2012 OSA

OCIS Codes
(300.2530) Spectroscopy : Fluorescence, laser-induced
(300.6470) Spectroscopy : Spectroscopy, semiconductors

ToC Category:
Spectroscopy

History
Original Manuscript: August 30, 2012
Revised Manuscript: November 28, 2012
Manuscript Accepted: December 3, 2012
Published: December 12, 2012

Citation
Shanshan Bao, Zheng Hua, Xiaoyong Wang, Yong Zhou, Chunfeng Zhang, Wenguang Tu, Zhigang Zou, and Min Xiao, "Indirect optical transitions in hybrid spheres with alternating layers of titania and graphene oxide nanosheets," Opt. Express 20, 28801-28807 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-27-28801


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