Architecture designed ZnO hollow microspheres with wide-range visible-light photoresponses

Sun, Ziqi, Liao, Ting, Kim, Jae-Geun, Liu, Kesong, Jiang, Lei, Kim, Jung Ho and Dou, Shi Xue (2013) Architecture designed ZnO hollow microspheres with wide-range visible-light photoresponses. Journal of Materials Chemistry C, 1 42: 6924-6929. doi:10.1039/c3tc31649a

Author Sun, Ziqi
Liao, Ting
Kim, Jae-Geun
Liu, Kesong
Jiang, Lei
Kim, Jung Ho
Dou, Shi Xue
Title Architecture designed ZnO hollow microspheres with wide-range visible-light photoresponses
Journal name Journal of Materials Chemistry C   Check publisher's open access policy
ISSN 2050-7526
Publication date 2013-11-01
Year available 2013
Sub-type Article (original research)
DOI 10.1039/c3tc31649a
Open Access Status Not Open Access
Volume 1
Issue 42
Start page 6924
End page 6929
Total pages 6
Place of publication Cambridge, United Kingdom
Publisher RSC Publications
Language eng
Abstract It is a challenge to increase the visible-light photoresponses of wide-gap metal oxides. In this study, we proposed a new strategy to enhance the visible-light photoresponses of wide-gap semiconductors by deliberately designing a multi-scale nanostructure with controlled architecture. Hollow ZnO microspheres with constituent units in the shape of one-dimensional (1D) nanowire networks, 2D nanosheet stacks, and 3D mesoporous nanoball blocks are synthesized via an approach of two-step assembly, where the oligomers or the constituent nanostructures with specially designed structures are first formed, and then further assembled into complex morphologies. Through deliberate designing of constituent architectures allowing multiple visible-light scattering, reflections, and dispersion inside the multiscale nanostructures, enhanced wide range visible-light photoresponses of the ZnO hollow microspheres were successfully achieved. Compared to the one-step synthesized ZnO hollow microspheres, where no nanostructured constituents were produced, the ZnO hollow microspheres with 2D nanosheet stacks presented a 50 times higher photocurrent in the visible-light range (λ > 420 nm). The nanostructure induced visible-light photoresponse enhancement gives a direction to the development of novel photosensitive materials.
Keyword Sensitized solar-cells
Photocatalytic activity
Oxide nanostructures
High efficiency
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
Australian Institute for Bioengineering and Nanotechnology Publications
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