Shape-dependent catalytic activity of silver nanoparticles for the oxidation of styrene.

Metal nanoparticles with different shapes have different crystallographic faces. It is therefore of interest to study the effect of the shape of metal nanoparticles on their catalytic activity in various organic and inorganic reactions. Truncated triangular silver nanoplates with well-defined planes were synthesized by a simple solvothermal approach. The activity of these truncated triangular silver nanoparticles was compared with that of cubic and near-spherical silver nanoparticles in the oxidation of styrene in colloidal solution. It was found that the crystal faces of silver nanoparticles play an essential role in determining the catalytic oxidation properties. The silver nanocubes had the {100} crystal faces as the basal plane, whereas truncated triangular nanoplates and near-spherical nanoparticles predominantly exposed the most-stable {111} crystal faces. As a result, the rate of the reaction over the nanocubes was more than 14 times higher than that on nanoplates and four times higher than that on near-spherical nanoparticles.

[1]  M. Pileni,et al.  Magnetic Fluids: Fabrication, Magnetic Properties, and Organization of Nanocrystals , 2001 .

[2]  C. Mirkin,et al.  Photoinduced Conversion of Silver Nanospheres to Nanoprisms , 2001, Science.

[3]  Luis M. Liz-Marzán,et al.  Formation and Stabilization of Silver Nanoparticles through Reduction by N,N-Dimethylformamide , 1999 .

[4]  Jiqing Lu,et al.  Epoxidation of propylene on NaCl-modified silver catalysts with air as the oxidant , 2002 .

[5]  M. El-Sayed,et al.  Some interesting properties of metals confined in time and nanometer space of different shapes. , 2001, Accounts of chemical research.

[6]  Christopher B. Murray,et al.  Monodisperse 3d Transition-Metal (Co, Ni, Fe) Nanoparticles and Their Assembly into Nanoparticle Superlattices , 2001 .

[7]  Younan Xia,et al.  Synthesis and characterization of stable aqueous dispersions of silver nanoparticles through the Tollens process , 2002 .

[8]  Z. Wang,et al.  Transmission Electron Microscopy of Shape-Controlled Nanocrystals and Their Assemblies , 2000 .

[9]  Catherine J. Murphy,et al.  Wet Chemical Synthesis of High Aspect Ratio Cylindrical Gold Nanorods , 2001 .

[10]  J. Sueiras,et al.  Different morphologies of silver nanoparticles as catalysts for the selective oxidation of styrene in the gas phase. , 2004, Chemical communications.

[11]  David L. Carroll,et al.  Synthesis and Characterization of Truncated Triangular Silver Nanoplates , 2002 .

[12]  R. G. Freeman,et al.  Submicrometer metallic barcodes. , 2001, Science.

[13]  Zuyao Chen,et al.  A Novel Ultraviolet Irradiation Technique for Shape-Controlled Synthesis of Gold Nanoparticles at Room Temperature , 1999 .

[14]  M. Reetz,et al.  Surface Spectroscopic Study of the Stabilization Mechanism for Shape-Selectively Synthesized Nanostructured Transition Metal Colloids , 2000 .

[15]  K. Klabunde,et al.  Benzylation of aromatic compounds with different crystallites of MgO. , 2003, Journal of the American Chemical Society.

[16]  V. Yam,et al.  Controlled synthesis of monodisperse silver nanocubes in water. , 2004, Journal of the American Chemical Society.

[17]  Peter P. Edwards,et al.  Ein Kupfer‐Organosol mit wohldefinierter Morphologie , 1988 .

[18]  J. V. Sanders,et al.  The structure and orientation of crystals in deposits of metals on mica , 1967 .

[19]  L. Lewis.  Chemical catalysis by colloids and clusters , 1993 .

[20]  A. Kirkland,et al.  A Morphology‐Selective Copper Organosol , 1988 .

[21]  Steven R. Emory,et al.  Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering , 1997, Science.

[22]  G. Somorjai,et al.  Surface Science Approach to Modeling Supported Catalysts , 1997 .

[23]  C. Campbell,et al.  Methanol Synthesis and Reverse Water–Gas Shift Kinetics over Cu(110) Model Catalysts: Structural Sensitivity , 1996 .

[24]  M. El-Sayed,et al.  Catalysis with transition metal nanoparticles in colloidal solution: nanoparticle shape dependence and stability. , 2005, The journal of physical chemistry. B.

[25]  R. Moyzis,et al.  The human telomere. , 1991, Scientific American.

[26]  R. V. Hardeveld,et al.  The statistics of surface atoms and surface sites on metal crystals , 1969 .

[27]  Prashant V. Kamat,et al.  Photophysical, photochemical and photocatalytic aspects of metal nanoparticles , 2002 .

[28]  X. Bao,et al.  Epoxidation of Propylene on NaCl-Modified VCe1-x Cux Oxide Catalysts with Direct Molecular Oxygen as the Oxidant , 2002 .

[29]  A. Requicha,et al.  Plasmonics—A Route to Nanoscale Optical Devices , 2001 .

[30]  Xun Wang,et al.  Surface structure effects in nanocrystal MnO2 and Ag/MnO2 catalytic oxidation of CO , 2006 .

[31]  Mostafa A. El-Sayed,et al.  Shape-Dependent Catalytic Activity of Platinum Nanoparticles in Colloidal Solution , 2004 .

[32]  Qing Peng,et al.  Enhanced catalytic activity of ceria nanorods from well-defined reactive crystal planes , 2005 .

[33]  Younan Xia,et al.  Uniform Silver Nanowires Synthesis by Reducing AgNO3 with Ethylene Glycol in the Presence of Seeds and Poly(Vinyl Pyrrolidone) , 2002 .

[34]  J. G. Serafin,et al.  Surface science and the silver-catalyzed epoxidation of ethylene: an industrial perspective , 1998 .

[35]  L. Dick,et al.  Metal film over nanosphere (MFON) electrodes for surface-enhanced Raman spectroscopy (SERS): Improvements in surface nanostructure stability and suppression of irreversible loss , 2002 .

[36]  Younan Xia,et al.  Shape-Controlled Synthesis of Gold and Silver Nanoparticles , 2002, Science.