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14 October 2004 Seeded solution synthesis of straight and branched CdSe nanowires
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The solution phase synthesis of narrow diameter (< 10 nm) CdSe NWs is described. Crystalline NWs with lengths between 1-10 mm are obtained using a seeded solution approach, whereby NW growth is catalyzed by Au/Bi core/shell NPs. A gold biphasic reduction step results in 1.5 (3) nm diameter Au NPs and is followed by the thermolysis of trialkylbismuthines to yield low melting, bimetallic particles with diameters less than 3 nm. These Au/Bi NPs are catalytically active towards the growth of similar diameter CdSe NWs (~7 nm) that exhibit unique quantum confinement effects since the bulk exciton Bohr radius of CdSe is 5.6 nm. Manipulating the Cd:Se ratio results in a transition from straight to branched NWs, yielding v-shapes, tripods, y-shapes, as well as higher order structures. Structural characterization shows NW growth along either the [111] or [0001] directions of zinc blende (ZB) and wurtzite (W) phases respectively for both straight and branched NWs. High resolution TEM imaging reveals that the NWs alternate between ZB and W along their length. A similar reaction scheme can be used to produce PbSe NWs with diameters less than 5 nm, demonstrating the generality of the technique.
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Katherine L. Hull, James W. Grebinski, Jing Zhang, Thomas H. Kosel, and Masaru K. Kuno "Seeded solution synthesis of straight and branched CdSe nanowires", Proc. SPIE 5513, Physical Chemistry of Interfaces and Nanomaterials III, (14 October 2004); doi: 10.1117/12.557526;

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