Hydrothermal preparation and optical properties of orientation-controlled WO3 nanorod arrays on ITO substrates

The orientation controlled synthesis of h-WO3 nanostructures on ITO substrates has been successfully realized in large scale via a simple hydrothermal method. The influences of pH value and growth time on the orientation and morphology of WO3 nanostructures were investigated by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The nanorod bundles parallel to ITO substrate and nanorod arrays vertical to ITO substrate can be selectively prepared by adjusting the final pH value just to 2.0 and 2.4, respectively. The morphology evolution and the growth mechanism of well aligned WO3 nanorod arrays were intensively studied. Moreover, the optical properties of the WO3 with different oriented alignment were also examined.

[1]  Jinmin Wang,et al.  Controlled synthesis of WO3 nanorods and their electrochromic properties in H2SO4 electrolyte , 2009 .

[2]  F. Paraguay-Delgado,et al.  Synthesis and characterization of WO3 nanostructures prepared by an aged-hydrothermal method , 2009 .

[3]  Liejin Guo,et al.  Vertically aligned WO₃ nanowire arrays grown directly on transparent conducting oxide coated glass: synthesis and photoelectrochemical properties. , 2011, Nano letters.

[4]  C. Bougerol,et al.  Unit-cell intergrowth of pyrochlore and hexagonal tungsten bronze structures in secondary tungsten minerals , 2006 .

[5]  Fu-Rong Chen,et al.  WO3−x nanowires based electrochromic devices , 2006 .

[6]  Jinmin Wang,et al.  Synthesis, Assembly, and Electrochromic Properties of Uniform Crystalline WO3 Nanorods , 2008 .

[7]  Xiuli Wang,et al.  Hydrothermally synthesized WO3 nanowire arrays with highly improved electrochromic performance , 2011 .

[8]  M. Sunkara,et al.  Vapor phase synthesis of tungsten nanowires. , 2003, Journal of the American Chemical Society.

[9]  M. Sunkara,et al.  Nanowire-based electrochromic devices , 2007 .

[10]  M. Gutowski,et al.  Driving force for the WO3(001) surface relaxation , 2005 .

[11]  Miran Mozetic,et al.  Nanowire sensor response to reactive gas environment , 2008 .

[12]  Xp Wang,et al.  Tungsten Oxide Nanorods Array and Nanobundle Prepared by Using Chemical Vapor Deposition Technique , 2007, Nanoscale Research Letters.

[13]  Yongyao Xia,et al.  Large-scale synthesis of single-crystal hexagonal tungsten trioxide nanowires and electrochemical lithium intercalation into the nanocrystals , 2007 .

[14]  Jang-Hoon Ha,et al.  Hydrothermal synthesis and characterization of self-assembled h-WO3 nanowires/nanorods using EDTA salts , 2009 .

[15]  Bin Yang,et al.  Strong photoresponse of nanostructured tungsten trioxide films prepared via a sol–gel route , 2007 .

[16]  F. Sediri,et al.  Characterization of h-WO3 nanorods synthesized by hydrothermal process , 2010 .

[17]  M. Miyauchi,et al.  Efficient electrochemical reaction in hexagonal WO3 forests with a hierarchical nanostructure , 2009 .

[18]  W. Seo,et al.  Synthesis and optical properties of colloidal tungsten oxide nanorods. , 2003, Journal of the American Chemical Society.

[19]  G. Stucky,et al.  Benzyl alcohol and transition metal chlorides as a versatile reaction system for the nonaqueous and low-temperature synthesis of crystalline nano-objects with controlled dimensionality. , 2002, Journal of the American Chemical Society.

[20]  J. Yao,et al.  Controllable assembly of WO3 nanorods/nanowires into hierarchical nanostructures. , 2006, The journal of physical chemistry. B.

[21]  Jing Sun,et al.  Effects of morphologies on acetone-sensing properties of tungsten trioxide nanocrystals , 2011 .

[22]  G. Wijs,et al.  Structure and electronic properties of amorphous WO3 , 1999 .

[23]  Huimin Zhao,et al.  High photocatalytic capability of self-assembled nanoporous WO3 with preferential orientation of (002) planes. , 2007, Environmental science & technology.

[24]  Masahiro Miyauchi,et al.  Site‐Selective Deposition of Metal Nanoparticles on Aligned WO3 Nanotrees for Super‐Hydrophilic Thin Films , 2009 .