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      Biological synthesis of triangular gold nanoprisms.

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          Abstract

          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.

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          Author and article information

          Journal
          Nat Mater
          Nature materials
          Springer Science and Business Media LLC
          1476-1122
          1476-1122
          Jul 2004
          : 3
          : 7
          Affiliations
          [1 ] Materials Chemistry, National Chemical Laboratory, Pune-411 008, India.
          Article
          nmat1152
          10.1038/nmat1152
          15208703
          97ffb7cb-5994-4ac1-ab54-113b0484f6a9
          History

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