Biological synthesis of triangular gold nanoprisms

The optoelectronic and physicochemical properties of nanoscale matter are a strong function of particle size. Nanoparticle shape also contributes significantly to modulating their electronic properties. Several shapes ranging from rods to wires to plates to teardrop structures may be obtained by chemical methods; triangular nanoparticles have been synthesized by using a seeded growth process. Here, we report the discovery that the extract from the lemongrass plant, when reacted with aqueous chloroaurate ions, yields a high percentage of thin, flat, single-crystalline gold nanotriangles. The nanotriangles seem to grow by a process involving rapid reduction, assembly and room-temperature sintering of 'liquid-like' spherical gold nanoparticles. The anisotropy in nanoparticle shape results in large near-infrared absorption by the particles, and highly anisotropic electron transport in films of the nanotriangles.

[1]  A. R. Tatchell,et al.  Vogel's Textbook of Practical Organic Chemistry , 1996 .

[2]  R. Pleixats,et al.  Formation of carbon--carbon bonds under catalysis by transition-metal nanoparticles. , 2003, Accounts of chemical research.

[3]  F J García de Abajo,et al.  Optical properties of gold nanorings. , 2003, Physical review letters.

[4]  N. Kröger,et al.  Polycationic peptides from diatom biosilica that direct silica nanosphere formation. , 1999, Science.

[5]  Younan Xia,et al.  Transformation of Silver Nanospheres into Nanobelts and Triangular Nanoplates through a Thermal Process , 2003 .

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

[7]  J. Hupp,et al.  Synthesis of silver nanodisks using polystyrene mesospheres as templates. , 2002, Journal of the American Chemical Society.

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

[9]  Satyajyoti Senapati,et al.  Enzyme mediated extracellular synthesis of CdS nanoparticles by the fungus, Fusarium oxysporum. , 2002, Journal of the American Chemical Society.

[10]  M. Lauer,et al.  Spherical and Planar Gold(0) Nanoparticles with a Rigid Gold(I)−Anion or a Fluid Gold(0)−Acetone Surface† , 2003 .

[11]  A. Alivisatos.  Perspectives on the Physical Chemistry of Semiconductor Nanocrystals , 1996 .

[12]  J. Storhoff,et al.  A DNA-based method for rationally assembling nanoparticles into macroscopic materials , 1996, Nature.

[13]  Sun,et al.  Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices , 2000, Science.

[14]  M. Sarikaya,et al.  A genetic analysis of crystal growth. , 2000, Journal of molecular biology.

[15]  R. McPherson,et al.  Accumulation of elemental gold on the alga Chlorella vulgaris , 1986 .

[16]  M. Steigerwald,et al.  Biosynthesis of cadmium sulphide quantum semiconductor crystallites , 1989, Nature.

[17]  Nicholas A. Kotov,et al.  Layer-by-Layer Assembled Mixed Spherical and Planar Gold Nanoparticles: Control of Interparticle Interactions , 2002 .

[18]  S. Nie,et al.  Quantum-dot-tagged microbeads for multiplexed optical coding of biomolecules , 2001, Nature Biotechnology.

[19]  C. Mirkin,et al.  Controlling anisotropic nanoparticle growth through plasmon excitation , 2003, Nature.

[20]  Derek R. Lovley,et al.  Anaerobic production of magnetite by a dissimilatory iron-reducing microorganism , 1987, Nature.

[21]  R. Kumar,et al.  Extracellular Biosynthesis of Monodisperse Gold Nanoparticles by a Novel Extremophilic Actinomycete, Thermomonospora sp. , 2003 .

[22]  E Olsson,et al.  Silver-based crystalline nanoparticles, microbially fabricated. , 1999, Proceedings of the National Academy of Sciences of the United States of America.

[23]  M. Brust,et al.  Templated Gold Nanowire Self‐Assembly on Carbon Substrates , 2001 .

[24]  Sudhakar R. Sainkar,et al.  BIOREDUCTION OF AUCL4− IONS BY THE FUNGUS, VERTICILLIUM SP. AND SURFACE TRAPPING OF THE GOLD NANOPARTICLES FORMED , 2001 .

[25]  Liberato Manna,et al.  Synthesis of Soluble and Processable Rod-, Arrow-, Teardrop-, and Tetrapod-Shaped CdSe Nanocrystals , 2000 .

[26]  J. Banfield,et al.  Formation of sphalerite (ZnS) deposits in natural biofilms of sulfate-reducing bacteria. , 2000, Science.

[27]  S. Weiner,et al.  Interactions of sea-urchin skeleton macromolecules with growing calcite crystals— a study of intracrystalline proteins , 1988, Nature.

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

[29]  Weidong Yang,et al.  Shape control of CdSe nanocrystals , 2000, Nature.

[30]  R. Stafford,et al.  Nanoshell-mediated near-infrared thermal therapy of tumors under magnetic resonance guidance , 2003, Proceedings of the National Academy of Sciences of the United States of America.

[31]  R. Silverstein,et al.  Spectrometric identification of organic compounds , 2013 .

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