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Anisotropic Metal Nanoparticles: Synthesis, Assembly, and Optical Applications

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i!V2^w [1E#K Pictured above are the authors of the top 5 most current [i]Hot Papers[/i] from ACS Publications as recognized by Thomson Scientific's Essential Science Indicators:
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[url=http://pubs.acs.org/cgi-bin/abstract.cgi/jpcbfk/2005/109/i29/abs/jp0516846.html%20]Anisotropic Metal Nanoparticles: Synthesis, Assembly, and Optical Applications[/url]
,J%PO.{O"Npz_ Murphy, C. J.; Sau, T. K.; Gole, A. M.; Orendorff, C. J.; Gao, J.; Gou, L.; Hunyadi, S. E.; Li, T.
4B2Qh6q3x5sP-f(M J. Phys. Chem. B.; (Feature Article); [b]2005[/b]; 109(29); 13857-13870. DOI: 10.1021/jp0516846
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I@&tES W D [b]This article will be introduced as follow:[/b]
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[size=3][Title]:[b]Anisotropic Metal Nanoparticles: Synthesis, Assembly, and Optical Applications[/b] [/size]7x5d9RW Ky j5Tx
[size=3][Author]:Catherine J. Murphy,[url=http://pubs.acs.org/cgi-bin/sample.cgi/jpcbfk/2005/109/i29/html/jp0516846.html#jp0516846AF1][color=#0000ff]*[/color][/url] Tapan K. Sau, Anand M. Gole, Christopher J. Orendorff, Jinxin Gao, Linfeng Gou, Simona E. Hunyadi, and Tan Li [/size]6u\ E#uWdS\
[size=3][Journal]: [i]J. Phys. Chem. B,[/i] 109 (29), 13857 -13870, 2005. 10.1021/jp0516846 S1089-5647(05)01684-6 [/size][size=3][Abstract]:
m0~%XN#x:iRf9r This feature article highlights work from the authors' laboratories on the synthesis, assembly, reactivity, and optical applications of metallic nanoparticles of nonspherical shape, especially nanorods. The synthesis is a seed-mediated growth procedure, in which metal salts are reduced initially with a strong reducing agent, in water, to produce ~4 nm seed particles. Subsequent reduction of more metal salt with a weak reducing agent, in the presence of structure-directing additives, leads to the controlled formation of nanorods of specified aspect ratio and can also yield other shapes of nanoparticles (stars, tetrapods, blocks, cubes, etc.). Variations in reaction conditions and crystallographic analysis of gold nanorods have led to insight into the growth mechanism of these materials. Assembly of nanorods can be driven by simple evaporation from solution or by rational design with molecular-scale connectors. Short nanorods appear to be more chemically reactive than long nanorods. Finally, optical applications in sensing and imaging, which take advantage of the visible light absorption and scattering properties of the nanorods, are discussed. ,Ny)q.I.v9D{ mm
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"Green" Synthesis of Metallic Nanorods with Tunable Aspect RatioU*ET$Y Z4{
[align=center][attach]2111[/attach][/align]Figure 2 Seed-mediated growth approach to making gold and silver nanorods of controlled aspect ratio. The specific conditions shown here, for 20 mL volume of seed solution, lead to high-aspect ratio gold nanorods. (bottom right) Transmission electron micrograph of gold nanorods that are an average of 500 nm long. 6Yr4@0D]2oC1V{j
Crystallography of Metal Nanorods: Insight into the Growth Mechanism fr [2wR"Q
[align=center][attach]2112[/attach][/align]Figure 8 Proposed mechanism of surfactant-directed metal nanorod growth. The single crystalline seed particles have facets that are differentially blocked by surfactant (or an initial halide layer that then electrostatically attracts the cationic surfactant). Subsequent addition of metal ions and weak reducing agent lead to metallic growth at the exposed particle faces. In this example, the pentatetrahedral twin formation leads to Au {111} faces that are on the ends of the nanorods, leaving less stable faces of gold as the side faces, which are bound by the surfactant bilayer. 0ie`6r3M
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Assembling Nanorods in One, Two and Three Dimensions: Surface Chemistry Is Key
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x S [align=center][attach]2113[/attach][/align]Figure 9 Cartoon of biotin-streptavidin assembly of gold nanorods; a biotin disulfide is added to biotinylate the rods, and subsequent addition of streptavidin causes noncovalent assembly. Inset: transmission electron micrograph of gold nanorod-streptavidin assemblies. The original data are from ref 86.
x7@sq'e9hiL#] [align=center][attach]2114[/attach][/align]Figure 12 Cartoon showing the preparation of a self-assembled monolayer of mercaptohexanoic acid (MHA) on a flat gold substrate, subsequent immersion into an aqueous solution of CTAB-capped gold nanorods at a pH greater than 6 (so that the acid group is deprotonated), and final immobilization of the nanorods on the surface, governed by electrostatic interactions. Also shown is an atomic force microscopy image of nanorods immobilized in this fashion; field of view, 5 [img]http://pubs.acs.org/images/entities/mgr.gif[/img]m.
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x{#fAW'I sE Reactivity of Metallic Nanorods: Core-Shell MaterialsJb5~tG-c

:iD4D-|5?eu.T X Optical Properties of Metallic Nanorods and Nanowires: Chemical Sensing and Imaging^K2{ F&] e-k

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