Anatase TiO2 single crystals with a large percentage of reactive facets

Hua Gui Yang, Cheng Hua Sun, Shi Zhang Qiao (), Jin Zou, Gang Liu, Sean Campbell Smith, Hui Ming Cheng and Gao Qing Lu ()
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Hua Gui Yang: ARC Centre of Excellence for Functional Nanomaterials, School of Engineering and Australian Institute for Bioengineering and Nanotechnology,
Cheng Hua Sun: ARC Centre of Excellence for Functional Nanomaterials, School of Engineering and Australian Institute for Bioengineering and Nanotechnology,
Shi Zhang Qiao: ARC Centre of Excellence for Functional Nanomaterials, School of Engineering and Australian Institute for Bioengineering and Nanotechnology,
Jin Zou: Centre for Microscopy and Microanalysis and School of Engineering, The University of Queensland, Queensland 4072, Australia
Gang Liu: ARC Centre of Excellence for Functional Nanomaterials, School of Engineering and Australian Institute for Bioengineering and Nanotechnology,
Sean Campbell Smith: ARC Centre of Excellence for Functional Nanomaterials, School of Engineering and Australian Institute for Bioengineering and Nanotechnology,
Hui Ming Cheng: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
Gao Qing Lu: ARC Centre of Excellence for Functional Nanomaterials, School of Engineering and Australian Institute for Bioengineering and Nanotechnology,

Nature, 2008, vol. 453, issue 7195, 638-641

Abstract: Surface activation: Changing facets Single crystals of titanium dioxide (TiO2), with highly reactive surfaces, show promise for energy and environmental applications. Unfortunately, the highly reactive surfaces tend to disappear during crystal growth as a result of the minimization of surface energy. Most available samples of anatase, a naturally occurring crystalline form of TiO2, are therefore dominated (to over 90%) by thermodynamically stable {101} facets, rather than the more reactive {001} type. Hua Gui Yang et al. use hydrofluoric acid treatment of anatase TiO2 to remedy this situation. Based on theoretical predictions, they synthesized uniform anatase TiO2 single crystals containing 47% of the reactive {001} facets. This work may pave the way for the more general use of non-metallic atoms as surface controlling agents.

Date: 2008
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DOI: 10.1038/nature06964

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