Growth of multi-step shaped CdTe nanowires and a distinct photoelectric response in a single nanowire
Growth of multi-step shaped CdTe nanowires and a distinct photoelectric response in a single nanowire
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DOI：
10.1039/c3ce40650d
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发表时间：
2013-08
期刊：
影响因子：
3.1
通讯作者：
Jun Zhou;Guihuan Chen;Biao Nie;J. Zuo;Jia Song;L. Luo;Qing Yang
中科院分区：
文献类型：
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作者：
Jun Zhou;Guihuan Chen;Biao Nie;J. Zuo;Jia Song;L. Luo;Qing Yang
以CdCl 2和二苯基二碲化物为原料，在磷酸三（2-乙基己基）酯（TEHP）的辅助下，在油胺中于240 °C反应1 h，合成了具有锌纳米晶相的多台阶形状的CdTe纳米线。一维CdTe纳米线的长度可达20 μm，直径约为250-300 nm。研究表明，TEHP在粗糙表面纳米线的生长过程中起着重要的作用。研究了纳米线的生长过程，发现多台阶纳米线的生长是在TEHP辅助下，小尺寸飞碟状纳米结构沿着轴向在定向附着生长机制下自发聚集和组装的结果。同时，对所制备的CdTe纳米线的电学和光电性能进行了研究，发现其具有p型电学特性。更重要的是，在室温下在典型的单个纳米线中观察到明显的强光电响应，因为光电流是白色光照明下暗电流的60倍以上。
Multi-step shaped CdTe nanowires with a zinc blende phase have been synthesized from the reaction of CdCl2 with diphenyl ditelluride in oleylamine with the assistance of tris(2-ethylhexyl) phosphate (TEHP) at 240 °C for 1 h. The one-dimensional CdTe nanostructured nanowires are observed with lengths up to 20 μm and about 250–300 nm in diameter. Investigations show that TEHP plays an important role in the growth of the nanowires with rough surfaces. The growth process of the nanowires is studied and it is found that the growth of the multi-step nanowires results from the spontaneous aggregation and assembly of small-sized flying saucer-like nanostructures along the axial direction under an oriented attachment growth regime with the assistance of TEHP. Meanwhile, the electrical and photoelectrical properties of the as-prepared CdTe nanowires are investigated and the nanowires exhibit p-type electrical characteristics. More importantly, a distinct strong photoelectric response is observed in a typical individual nanowire at room temperature since the photocurrent is over 60 times that of dark current at white light illumination.