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合成超长单分散的金纳米线:生长机理及其电化学性能
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摘要
通过碲纳米线与金前驱体的置换反应制备出超长、单分散的金纳米线。该方法简单直接,并且不需要加入对电催化不利的有机表面活性剂。通过控制反应时间和前驱体的加入量,研究了金纳米线的形成过程和机理。在Au纳米线的形成过程中,其结构发生了一系列的演变:从碲纳米线到带孔的金@碲纳米线,锯齿状的金@碲结构,短开的金@碲纳米线,最后演变成超长的金纳米线。形成超长单分散的金纳米线,无机离子的协同作用起着非常重要的作用。在甲醇的催化氧化反应中,与相同直径的金纳米颗粒相比,该金纳米线展示出更好的电催化性能。
This report describes new findings of an investigation of the growth mechanism of gold nanowires(Au NWs) synthesized by a simple synthetic route based on galvanic replacement reaction of Te nanowires as an initial template. By manipulating reaction time and Au precursor concentration, the formation of nanoparticle-free, ultralong and monodispersed gold nanowires has been demonstrated. An aggregative growth mechanism in terms of 1D and 3D growth pathways for the NW length and diameter, respectively, is revealed to be operative in the template-directed Au NW formation process, shinning some fresh insight on the controllability of the nanowire morphologies. The Au NWs have also been demonstrated in a preliminary experiment to exhibit enhanced electrocatalytic activities for methanol oxidation reaction, showing promise outperforming that for the nanoparticle counterpart.
引文
[1]X.Lu,M.Mc Kiernan,Z.Peng,E.P.Lee,H.Yang and Y.Xia.Adv.Mater..2010,2,413-420.
    [2]C.M.Cobley and Y.Xia.Mater.Sci.Eng.,R.2010,70,44-62.
    [3]C.Zhu,S.Guo and S.Dong.J.Mater.Chem..2012,22,14851-14855.
    [4]H.W.Liang,S.Liu,J.Y.Gong,S.B.Wang,L.Wang and S.H.Yu.Adv.Mater..2009,21,1850-1854.
    [5]Z.-H.Lin and H.-T.Chang.Langmuir.2008,24,365-367.

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