Structural and optical characterization of CdS nanorods synthesized by a PVA-assisted solvothermal method
Structural and optical characterization of CdS nanorods synthesized by a PVA-assisted solvothermal method
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DOI：
10.1016/j.jallcom.2007.07.002
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发表时间：
2008-08
影响因子：
6.2
通讯作者：
Hongmei Wang;P. Fang;Zhe Chen;Shao-jie Wang
中科院分区：
文献类型：
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作者：
Hongmei Wang;P. Fang;Zhe Chen;Shao-jie Wang
采用聚乙烯醇（PVA）辅助溶剂热法，以乙二胺（en）为溶剂，制备了硫化镉（CdS）一维纳米晶。通过X射线衍射（XRD）、透射电子显微镜（TEM）、高分辨透射电子显微镜（HRTEM）、紫外-可见（UV-vis）吸收光谱和光致发光（PL）光谱对所得纳米棒进行了表征。XRD结果表明纳米棒为六方相。TEM结果表明，与不存在PVA的情况下制备的样品相比，PVA辅助合成的CdS纳米棒具有更大的长径比和均匀的表面。光致发光和紫外-可见光谱的测试结果表明，所制备的CdS纳米棒具有量子限制效应。研究还发现PVA的用量对CdS纳米棒的形貌和光学性能有重要影响。当PVA用量为3g/70 ml时，得到了形貌规则、长度较长的CdS纳米棒。对PVA辅助溶剂热合成CdS纳米棒的可能机理进行了讨论。
Cadmium sulphide (CdS) 1D nanocrystals were prepared using a simple poly(vinyl-alcohol) (PVA)-assisted solvothermal method which employed ethylenediamine (en) as solvent. The obtained nanorods were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet–visible (UV–vis) absorption, and photoluminescence (PL) spectra. XRD results show that the nanorods are hexagonal phase. The TEM results indicate that the synthesized CdS nanorods with PVA-assisted showed larger aspect ratio and uniform faces compared with the sample prepared in the absence of PVA. The results of the photoluminescence and UV–vis spectroscopy measurements reveal that the as-prepared CdS nanorods show a quantum confinement effect. It is also found that the dosage of PVA is a vital factor in the morphology and optical properties of CdS nanorods. Moreover, when the best dosage of 3g PVA/70ml en was used, CdS nanorods with regular morphology and longer length were obtained. The probable mechanism for PVA-assisted solvothermal synthesis of CdS nanorods was also discussed.