Highly active and enhanced photocatalytic silicon nanowire arrays.

Nanoporous and nonporous three-dimensional silicon nanowire arrays (SiNWAs) prepared with metal-assisted chemical etching method were investigated as photocatalysts in dye photodegradation systematically. In comparison with nonporous SiNWAs, nanoporous SiNWAs have higher surface area, larger pore volume, stronger light absorption and better photocatalytic activity. After the HF-treatment, the photocatalytic activity of all kinds of SiNWAs increased significantly and the nanoporous SiNWAs showed excellent stability. The photocatalytic activity of different types of SiNWAs with hydrogen surface termination can be recovered by HF treatment. This study also reveal that the hydrogen terminated surfaces on silicon nanowires (SiNWs) enhance the performance of SiNWAs by increasing their photocatalytic activity.

[1]  X. Leng,et al.  Effects of tri-o-cresyl phosphate on serum estrogen and progesterone concentration and ATPase activity in the shell gland of adult hens. , 2000, Chemosphere.

[2]  Jr-Hau He,et al.  Slope-tunable Si nanorod arrays with enhanced antireflection and self-cleaning properties. , 2010, Nanoscale.

[3]  N. Wong,et al.  Large-area silicon nanowires from silicon monoxide for solar cell applications. , 2010, Journal of nanoscience and nanotechnology.

[4]  Yuqiu Wang,et al.  Directed synthesis of hierarchical nanostructured TiO2 catalysts and their morphology-dependent photocatalysis for phenol degradation. , 2008, Environmental science & technology.

[5]  Gong-Ru Lin,et al.  Subwavelength Si nanowire arrays for self-cleaning antireflection coatings , 2010 .

[6]  Shui-Tong Lee,et al.  Surface passivation and transfer doping of silicon nanowires. , 2009, Angewandte Chemie.

[7]  X. Duan,et al.  Photocatalytic Properties of Porous Silicon Nanowires. , 2010, Journal of materials chemistry.

[8]  C. Tsang,et al.  Metal (Cu, Au)-modified silicon nanowires for high-selectivity solvent-free hydrocarbon oxidation in air. , 2009, Chemical communications.

[9]  T. Albanis,et al.  TiO2-assisted photocatalytic degradation of azo dyes in aqueous solution: kinetic and mechanistic investigations A review , 2004 .

[10]  Li Wan,et al.  TiO2‐Based Composite Nanotube Arrays Prepared via Layer‐by‐Layer Assembly , 2005 .

[11]  Dong Yang,et al.  Carbon and Nitrogen Co-doped TiO2 with Enhanced Visible-Light Photocatalytic Activity , 2007 .

[12]  Jr-hau He,et al.  Synthesis of anti-reflective and hydrophobic Si nanorod arrays by colloidal lithography and reactive ion etching , 2011 .

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

[14]  R. Boukherroub,et al.  Photocatalytic activity of silicon nanowires under UV and visible light irradiation. , 2011, Chemical communications.

[15]  S. T. Lee,et al.  Etching behavior of silicon nanowires with HF and NH4F and surface characterization by attenuated total reflection Fourier transform infrared spectroscopy: similarities and differences between one-dimensional and two-dimensional silicon surfaces. , 2005, The journal of physical chemistry. B.

[16]  Mingwang Shao,et al.  Si/Pd nanostructure with high catalytic activity in degradation of eosin Y , 2009 .

[17]  Guohua Chen,et al.  Photoelectrocatalytic materials for environmental applications , 2009 .

[18]  Charles M. Lieber,et al.  A laser ablation method for the synthesis of crystalline semiconductor nanowires , 1998, Science.

[19]  P. Falaras,et al.  The photocatalytic activity and kinetics of the degradation of an anionic azo-dye in a UV irradiated porous titania foam , 2008 .

[20]  W. Feng,et al.  Degradation mechanism of azo dye C. I. reactive red 2 by iron powder reduction and photooxidation in aqueous solutions. , 2000, Chemosphere.

[21]  Charles M. Lieber,et al.  Doping and Electrical Transport in Silicon Nanowires , 2000 .

[22]  X. Duan,et al.  Electrically conductive and optically active porous silicon nanowires. , 2009, Nano letters.

[23]  R. Asahi,et al.  Visible-Light Photocatalysis in Nitrogen-Doped Titanium Oxides , 2001, Science.

[24]  R. M. Tromp,et al.  The influence of the surface migration of gold on the growth of silicon nanowires , 2006, Nature.

[25]  Jin-Song Hu,et al.  3D Flowerlike Ceria Micro/Nanocomposite Structure and Its Application for Water Treatment and CO Removal , 2007 .

[26]  S. T. Lee,et al.  FTIR spectroscopic studies of the stabilities and reactivities of hydrogen-terminated surfaces of silicon nanowires. , 2003, Inorganic chemistry.

[27]  Kui‐Qing Peng,et al.  Silicon nanowire array photoelectrochemical solar cells , 2008 .

[28]  Jaehwan Kim,et al.  The TiO(2) nanoparticle effect on the performance of a conducting polymer Schottky diode. , 2008, Nanotechnology.

[29]  Ning Wang,et al.  Bulk-quantity Si nanowires synthesized by SiO sublimation , 2000 .

[30]  Zhong‐Yong Yuan,et al.  Synthesis and characterization of carbon-modified titania photocatalysts with a hierarchical meso-/macroporous structure. , 2010 .

[31]  Shui-Tong Lee,et al.  Surface reactivity of Si nanowires , 2001 .

[32]  C. Tsang,et al.  Water‐Soluble Silicon Quantum Dots with Wavelength‐Tunable Photoluminescence , 2009 .

[33]  Shihong Xu,et al.  Preparations and Photocatalytic Properties of Visible-Light-Active Zinc Ferrite-Doped TiO2 Photocatalyst , 2009 .

[34]  C. Fan,et al.  Ultrastable, highly fluorescent, and water-dispersed silicon-based nanospheres as cellular probes. , 2009, Angewandte Chemie.

[35]  Yun Jeong Hwang,et al.  Single crystalline mesoporous silicon nanowires. , 2009, Nano letters.

[36]  Charles M. Lieber,et al.  Logic Gates and Computation from Assembled Nanowire Building Blocks , 2001, Science.

[37]  Yin Wu,et al.  Uniform, axial-orientation alignment of one-dimensional single-crystal silicon nanostructure arrays. , 2005, Angewandte Chemie.

[38]  A. Patil,et al.  Solar photocatalytic degradation of resorcinol a model endocrine disrupter in water using zinc oxide. , 2009, Journal of hazardous materials.

[39]  Jr-Hau He,et al.  Antireflection effect of ZnO nanorod arrays , 2010 .

[40]  Kui‐Qing Peng,et al.  Preparation of Large-Area Uniform Silicon Nanowires Arrays through Metal-Assisted Chemical Etching , 2008 .

[41]  X. Duan,et al.  Unveiling the formation pathway of single crystalline porous silicon nanowires. , 2011, ACS applied materials & interfaces.

[42]  Vishwas G. Pangarkar,et al.  Photocatalytic degradation for environmental applications – a review , 2002 .

[43]  M. Green,et al.  Antireflection and surface passivation behaviour of SiO2/Si/SiO2 quantum wells on silicon , 2002 .

[44]  Jr-Hau He,et al.  Periodic si nanopillar arrays fabricated by colloidal lithography and catalytic etching for broadband and omnidirectional elimination of Fresnel reflection. , 2010, Langmuir : the ACS journal of surfaces and colloids.

[45]  H. Pan,et al.  Binding Characteristics of CoPc/SnO2 by In-situ Process and Photocatalytic Activity under Visible Light Irradiation , 2008 .

[46]  Chun‐Sing Lee,et al.  Templating effect of hydrogen-passivated silicon nanowires in the production of hydrocarbon nanotubes and nanoonions via sonochemical reactions with common organic solvents under ambient conditions. , 2002, Journal of the American Chemical Society.

[47]  Zhong‐Yong Yuan,et al.  Hierarchical mesoporous phosphorus and nitrogen doped titania materials: Synthesis, characterization and visible-light photocatalytic activity , 2009 .

[48]  Zhiyong Fan,et al.  Controlled nanoscale doping of semiconductors via molecular monolayers. , 2008, Nature materials.

[49]  D. D. D. Ma,et al.  Excellent photocatalysis of HF-treated silicon nanowires. , 2009, Journal of the American Chemical Society.

[50]  Ning-Bew Wong,et al.  Silicon quantum dots: a general photocatalyst for reduction, decomposition, and selective oxidation reactions. , 2007, Journal of the American Chemical Society.