Effect of Facets of a- Fe2O3 Nanostructures on Gas-Sensing Performance

In order to investigate the effect of different facets on gas-sensing properties, we compare the gas-sensing performance between the gas sensors made from α-Fe2O3 nanocubes with dominant exposed {012} facets and α-Fe2O3 nanoplates with dominant exposed {001} facets. The nanocube-based gas sensor shows better gas-sensing performance than the nanoplate-based sensor. The difference in the gas-sensing performance suggests that the effect of exposed facets and the size effect are crucial to gas-sensing sensitivity. These findings indicate that controlling the exposed facet of nanocrystals can be a promising method to improve the gas-sensing performance.

[1]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[2]  Yong Jia,et al.  Novel Single-Crystalline Hierarchical Structured ZnO Nanorods Fabricated via a Wet-Chemical Route: Combined High Gas Sensing Performance with Enhanced Optical Properties , 2009 .

[3]  Taihong Wang,et al.  Highly sensitive ethanol sensors based on {100}-bounded In2O3 nanocrystals due to face contact , 2006 .

[4]  Lihong Dong,et al.  Template-Free Synthesis and Photocatalytic Properties of Novel Fe2O3 Hollow Spheres , 2007 .

[5]  Carlos R. Michel,et al.  Gas sensing properties of nanostructured bismuth oxychloride , 2011 .

[6]  Qingyi Pan,et al.  Grain size control and gas sensing properties of ZnO gas sensor , 2000 .

[7]  Yali Cao,et al.  Preparation and gas-sensing properties of pure and Nd-doped ZnO nanorods by low-heating solid-state chemical reaction , 2009 .

[8]  J. Koenderink.  Q… , 2014, Les noms officiels des communes de Wallonie, de Bruxelles-Capitale et de la communaute germanophone.

[9]  Changsheng Xie,et al.  Solution-Processed Gas Sensors Based on ZnO Nanorods Array with an Exposed (0001) Facet for Enhanced Gas-Sensing Properties , 2012 .

[10]  Xianfeng Yang,et al.  Continuous shape- and spectroscopy-tuning of hematite nanocrystals. , 2010, Inorganic chemistry.

[11]  Jian Jia,et al.  Porous CuO/SnO2 composite nanofibers fabricated by electrospinning and their H2S sensing properties , 2012 .

[12]  Xueping Gao,et al.  Morphology−Function Relationship of ZnO: Polar Planes, Oxygen Vacancies, and Activity , 2008 .

[13]  Ke Deng,et al.  Facet-mediated photodegradation of organic dye over hematite architectures by visible light. , 2012, Angewandte Chemie.

[14]  Yaqi Jiang,et al.  Synthesis of tin dioxide octahedral nanoparticles with exposed high-energy {221} facets and enhanced gas-sensing properties. , 2009, Angewandte Chemie.

[15]  Dingsheng Wang,et al.  Synthesis of Nearly Monodisperse Iron Oxide and Oxyhydroxide Nanocrystals , 2006 .

[16]  Michael Grätzel,et al.  Translucent thin film Fe2O3 photoanodes for efficient water splitting by sunlight: nanostructure-directing effect of Si-doping. , 2006, Journal of the American Chemical Society.

[17]  Jun Zhang,et al.  Facile Synthesis of Porous α-Fe2O3 Nanorods and Their Application in Ethanol Sensors , 2008 .