Synthesis of Au-decorated V2O5@ZnO heteronanostructures and enhanced plasmonic photocatalytic activity.

A ternary plasmonic photocatalyst consisting of Au-decorated V2O5@ZnO heteronanorods was successfully fabricated by an innovative four-step process: thermal evaporation of ZnO powders, CVD of intermediate on ZnO, solution deposition of Au NPs, and final thermal oxidization. SEM, TEM, EDX, XPS, and XRD analyses revealed that the interior cores and exterior shells of the as-prepared heteronanorods were single-crystal wurtzite-type ZnO and polycrystalline orthorhombic V2O5, respectively, with a large quantity of Au NPs inlaid in the V2O5 shell. The optical properties of the ternary photocatalyst were investigated in detail and compared with those of bare ZnO and V2O5@ZnO. UV-vis absorption spectra of ZnO, V2O5@ZnO, and Au-decorated V2O5@ZnO showed gradually enhanced absorption in the visible region. In addition, gradually decreased emission intensity was also observed in the photoluminescence (PL) spectra, revealing enhanced charge separation efficiency. Because of these excellent qualities, the photocatalytic behavior of the ternary photocatalyst was studied in the photodegradation of methylene blue under UV-vis irradiation, which showed an enhanced photodegradation rate nearly 7 times higher than that of bare ZnO and nearly 3 times higher than that of V2O5@ZnO, mainly owing to the enlarged light absorption region, the effective electron-hole separation at the V2O5-ZnO and V2O5-Au interfaces, and strong localization of plasmonic near-field effects.

[1]  P. Kamat,et al.  Enhanced Rates of Photocatalytic Degradation of an Azo Dye Using SnO2/TiO2 Coupled Semiconductor Thin Films. , 1995, Environmental science & technology.

[2]  Yuka Watanabe,et al.  Nitrogen-Concentration Dependence on Photocatalytic Activity of TiO2-xNx Powders , 2003 .

[3]  V. Murugesan,et al.  Solar photocatalytic degradation of azo dye: comparison of photocatalytic efficiency of ZnO and TiO2 , 2003 .

[4]  Jin-Song Hu,et al.  Mass production and high photocatalytic activity of ZnS nanoporous nanoparticles. , 2005, Angewandte Chemie.

[5]  M. S. El-shall,et al.  Nanocatalysis on tailored shape supports: Au and Pd nanoparticles supported on MgO nanocubes and ZnO nanobelts. , 2006, The journal of physical chemistry. B.

[6]  C. Zheng,et al.  Study of the electronic structure and photocatalytic activity of the BiOCl photocatalyst , 2006 .

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

[8]  E. A. El-Sharkawy,et al.  Comparative study for the removal of methylene blue via adsorption and photocatalytic degradation. , 2007, Journal of colloid and interface science.

[9]  C. Tang,et al.  Self-Assembled 3-D Architectures of BiOBr as a Visible Light-Driven Photocatalyst , 2008 .

[10]  Min Chen,et al.  A facile method to fabricate ZnO hollow spheres and their photocatalytic property. , 2008, The journal of physical chemistry. B.

[11]  Di Chen,et al.  Hierarchical WO3 Hollow Shells: Dendrite, Sphere, Dumbbell, and Their Photocatalytic Properties , 2008 .

[12]  C. Gopinath,et al.  Combustion Synthesis of Triangular and Multifunctional ZnO1−xNx (x ≤ 0.15) Materials , 2009 .

[13]  Y. Cho,et al.  Synthesis of Au−Cu2S Core−Shell Nanocrystals and Their Photocatalytic and Electrocatalytic Activity , 2010 .

[14]  D. Kang,et al.  Facile synthesis of core–shell SnO2/V2O5 nanowires and their efficient photocatalytic property , 2010 .

[15]  M. J. Chen,et al.  Heterogeneous lollipop-like V2O5/ZnO array: a promising composite nanostructure for visible light photocatalysis. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[16]  G. Meng,et al.  Aligned ZnO Nanorods with Tunable Size and Field Emission on Native Si Substrate Achieved via Simple Electrodeposition , 2010 .

[17]  Haoshen Zhou,et al.  Centimeter‐Long V2O5 Nanowires: From Synthesis to Field‐Emission, Electrochemical, Electrical Transport, and Photoconductive Properties , 2010, Advanced materials.

[18]  Jiaguo Yu,et al.  Improved visible-light photocatalytic activity of porous carbon self-doped ZnO nanosheet-assembled flowers , 2011 .

[19]  Hua-ming Li,et al.  Self-assembly and enhanced photocatalytic properties of BiOI hollow microspheres via a reactable ionic liquid. , 2011, Langmuir : the ACS journal of surfaces and colloids.

[20]  N. Chouhan,et al.  Photocatalytic CdSe QDs-decorated ZnO nanotubes: an effective photoelectrode for splitting water. , 2011, Chemical communications.

[21]  M. S. El-shall,et al.  Formation mechanisms of gold-zinc oxide hexagonal nanopyramids by heterogeneous nucleation using microwave synthesis. , 2011, Langmuir : the ACS journal of surfaces and colloids.

[22]  Xueqin Liu,et al.  Synthesis of one-dimensional TiO2/V2O5 branched heterostructures and their visible light photocatalytic activity towards Rhodamine B , 2011, Nanotechnology.

[23]  W. Tseng,et al.  Synthesis of ZnO nanorod grafted TiO2 nanotube 3-D arrayed heterostructure as supporting platform for nanoparticle deposition , 2011 .

[24]  Jiaguo Yu,et al.  Highly efficient visible-light-driven photocatalytic hydrogen production of CdS-cluster-decorated graphene nanosheets. , 2011, Journal of the American Chemical Society.

[25]  Chaorong Li,et al.  Nanostructured porous ZnO film with enhanced photocatalytic activity , 2011 .

[26]  Kijung Yong,et al.  Fabrication of CuO-ZnO nanowires on a stainless steel mesh for highly efficient photocatalytic applications. , 2011, Chemical communications.

[27]  T. Riedl,et al.  Solution Processed Vanadium Pentoxide as Charge Extraction Layer for Organic Solar Cells , 2011 .

[28]  D. Barreca,et al.  Vertically oriented CuO/ZnO nanorod arrays: from plasma-assisted synthesis to photocatalytic H2 production , 2012 .

[29]  Yuan Wang,et al.  Visible light photocatalysis of V2O5/TiO2 nanoheterostructures prepared via electrospinning , 2012 .

[30]  Aleksandra B. Djurišić,et al.  ZnO nanostructures: growth, properties and applications , 2012 .

[31]  Zhi Wei Seh,et al.  Janus Au‐TiO2 Photocatalysts with Strong Localization of Plasmonic Near‐Fields for Efficient Visible‐Light Hydrogen Generation , 2012, Advanced materials.

[32]  Hua Wang,et al.  Au/TiO2/Au as a Plasmonic Coupling Photocatalyst , 2012 .

[33]  D. P. Das,et al.  Facile synthesis of visible light responsive V2O5/N,S–TiO2 composite photocatalyst: enhanced hydrogen production and phenol degradation , 2012 .

[34]  J. Travas-sejdic,et al.  Porous V2O5 micro/nano-tubes: Synthesis via a CVD route, single-tube-based humidity sensor and improved Li-ion storage properties , 2012 .

[35]  Yadong Li,et al.  CuO quantum-dot-sensitized mesoporous ZnO for visible-light photocatalysis. , 2013, Chemistry.

[36]  W. Tremel,et al.  Controlled synthesis of linear and branched Au@ZnO hybrid nanocrystals and their photocatalytic properties. , 2013, Nanoscale.

[37]  Yuhua Wang,et al.  Plasmonic photocatalysis properties of Au nanoparticles precipitated anatase/rutile mixed TiO2 nanotubes. , 2013, Nanoscale.

[38]  L. Shang,et al.  Type-II ZnO nanorod-SnO2 nanoparticle heterostructures: characterization of structural, optical and photocatalytic properties. , 2013, Nanoscale.

[39]  Chi-Te Liang,et al.  Synthesis of graphene-ZnO-Au nanocomposites for efficient photocatalytic reduction of nitrobenzene. , 2013, Environmental science & technology.

[40]  G. Lu,et al.  Self-assembled CdS/Au/ZnO heterostructure induced by surface polar charges for efficient photocatalytic hydrogen evolution , 2013 .

[41]  Min Zeng,et al.  Influence of morphologies and pseudocapacitive contributions for charge storage in V2O5 micro/nano-structures , 2013 .

[42]  A. Xu,et al.  Facile Synthesis of the Novel Ag3VO4/AgBr/Ag Plasmonic Photocatalyst with Enhanced Photocatalytic Activity and Stability , 2013 .

[43]  Xueqin Liu,et al.  Effect of the morphology of V2O5/TiO2 nanoheterostructures on the visible light photocatalytic activity , 2013 .

[44]  H. Kominami,et al.  Functionalization of Au/TiO2 Plasmonic Photocatalysts with Pd by Formation of a Core–Shell Structure for Effective Dechlorination of Chlorobenzene under Irradiation of Visible Light , 2013 .

[45]  Feng Ren,et al.  Non-centrosymmetric Au-SnO2 hybrid nanostructures with strong localization of plasmonic for enhanced photocatalysis application. , 2013, Nanoscale.

[46]  W. W. Leung,et al.  Enhanced photocatalytic activity of electrospun TiO2/ZnO nanofibers with optimal anatase/rutile ratio , 2013 .

[47]  Fei Wang,et al.  Gold nanoparticle doped hollow SnO2 supersymmetric nanostructures for improved photocatalysis , 2013 .

[48]  Laisen Wang,et al.  Au-ZnO hybrid nanoflowers, nanomultipods and nanopyramids: one-pot reaction synthesis and photocatalytic properties. , 2014, Nanoscale.

[49]  B. Chi,et al.  Structurally controlled ZnO/TiO2 heterostructures as efficient photocatalysts for hydrogen generation from water without noble metals: The role of microporous amorphous/crystalline composite structure , 2014 .