Influence of organic polymers as capping agent on structural and optical properties of ZnS:Mn2+ and CdS nanocrystals.
Influence of organic polymers as capping agent on structural and optical properties of ZnS:Mn2+ and CdS nanocrystals.
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有机聚合物作为封端剂对 ZnS:Mn2 和 CdS 纳米晶体结构和光学性质的影响。
DOI：
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发表时间：
2008
影响因子：
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通讯作者：
A. C. Pandey
中科院分区：
文献类型：
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作者：
A. K. Keshari;M. Kumar;P. Singh;A. C. Pandey
以聚乙烯醇(PVA)、柠檬酸(CA)和生物素为有机封端剂，采用化学共沉淀法合成了发光的ZnS：Mn2+和裸露的CdS纳米晶。用X射线衍射仪、小角X射线散射仪和透射电子显微镜对合成的材料进行了结构分析，用紫外-可见光谱和光致发光(PL)对材料的光学性能进行了表征。结果表明，三种有机聚合物具有相同的效果，能够控制纳米团簇的生长。从紫外-可见吸收光谱可以看出，不同的封端剂对ZnS：Mn2+体系的禁带宽度影响不大，但对其发光性质有明显的影响。我们观察到了一个新的结果，与PVA和CA相比，生物素封端在ZnS：Mn2+-体系上表现出了良好的光致发光性能。另一方面，这些体系的退火会导致发光强度的下降。
We have synthesized the luminescent ZnS:Mn2+ and bare CdS nanocrystals by employing polyvinyl alcohol (PVA), citric acid (CA) and biotin as organic capping agents by chemical co-precipitation route. The synthesized materials were characterized by X-ray diffraction, small angle X-ray scattering and transmission electron microscopy for the structural analysis, while UV-Visible spectroscopy and photoluminescence (PL) for optical properties. The results show that all the three organic polymers have the same effect and are capable of controlling the growth of the nanoclusters. From UV-Visible absorption spectra, it was observed that different capping agents do not affect the band gap of ZnS:Mn2+ system as well, while capping effect clearly observed on PL properties of ZnS:Mn2+ system. We have observed a novel result that capping with biotin show excellent photoluminescence as compared to capping of PVA and CA on ZnS:Mn2+ -systems. On the other hand, the annealing of these systems leads to degradation of luminescence intensity.