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Preparation, characterization and growth mechanism study of CdS/Cr nanostructures

机译:CdS / Cr纳米结构的制备,表征及生长机理研究

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摘要

Dentiform nanorods and tasseilike nanowires CdS/Cr nanostructures were synthesized via a simple one-step thermal evaporation of CdS and Cr metal powder in mass scale. The morphology and detailed nanostructures were characterized by using scanning electron microscope, X-ray diffraction, and transmission electron microscope. The dentiform nanorods were fabricated at a low Ar flow rate, while the tassellike nanowires were created at a higher Ar flow rate. It is found that CdS/Cr dentiform nanostructures are the Cr-doped CdS nanostructure, whereas the tassellike nanowires CdS/Cr heterostructures are CdS nanowires attached with Cr particles on their surfaces. The selected area electron diffraction pattern indicates the Cr particle is polycrystalline, attributable to the {110}, {2 0 0} crystal planes of Cr. The formation of the CdS/Cr tassellike nanowires was initiated by the Au catalyst vapor-liquid-solid mechanism, and vapor-solid process also played a role in the defining the dentiform nanostructures. Photoluminescence measurements show that the tassellike nanowires have three emission bands around 468 nm, 510 nm and 718 nm, which originate from the enwrapped Cr, the band-gap of bulk CdS backbones and the surface defects of the CdS, respectively.
机译:通过对CdS和Cr金属粉末进行简单的一步热蒸发,大规模合成了齿状纳米棒和tasseilike纳米线CdS / Cr纳米结构。用扫描电子显微镜,X射线衍射和透射电子显微镜对形貌和详细的纳米结构进行了表征。牙状纳米棒是在低Ar流速下制造的,而流苏状纳米线是在Ar较高的流速下制造的。发现CdS / Cr齿状纳米结构是掺杂Cr的CdS纳米结构,而流苏状纳米线CdS / Cr异质结构是表面附着有Cr颗粒的CdS纳米线。所选区域的电子衍射图表明Cr颗粒是多晶的,这归因于Cr的{110},{2 0 0}晶面。 CdS / Cr流苏状纳米线的形成是由金催化剂的气-液-固机理引发的,而汽-固过程也对定义齿状纳米结构起了作用。光致发光测量表明,流苏状纳米线在468 nm,510 nm和718 nm处具有三个发射带,分别来自包裹的Cr,CdS本体骨架的带隙和CdS的表面缺陷。

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