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首页> 外文期刊>The Open Nanoscience Journal >Effect of Capping Agent Concentration on Photophysical Properties of Zinc Sulfide Nanocrystals
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Effect of Capping Agent Concentration on Photophysical Properties of Zinc Sulfide Nanocrystals

机译：封端剂浓度对硫化锌纳米晶体光物理性质的影响

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Zinc Sulfide (ZnS) nanoparticles with varying concentration of capping agent were prepared using chemicaltechnique. These particles were characterized using scanning electron microscope (SEM), atomic force microscope(AFM) and x-ray diffraction (XRD). It is observed that particle size decreases with increasing capping agent concentration.Optical absorption studies show that the absorption edge shifts towards blue region as the capping agent concentrationis increased indicating that effective band gap energy increases with decreasing the particle size. Using the effectivemass approximation model the particle size of nanoparticles has been estimated from the increased band gap, which ispractically the same as obtained by XRD. Photoluminescence (PL) investigations show that ZnS samples give single peakwith stoke shift. PL emission peak is obtained at 460 nm for uncapped nanoparticles. The PL spectra of ZnS nanoparticleswith different capping agent concentration reveals that the emission becomes more intensive and shifts towards blue as thesize of the particles is reduced.
机译：使用化学技术制备了具有不同浓度的封端剂的硫化锌（ZnS）纳米颗粒。使用扫描电子显微镜（SEM），原子力显微镜（AFM）和X射线衍射（XRD）对这些颗粒进行表征。观察到粒径随封端剂浓度的增加而减小。光学吸收研究表明，随着封端剂浓度的增加，吸收边向蓝色区域移动，表明有效带隙能量随粒度的减小而增加。使用有效质量近似模型，已经从增加的带隙估计了纳米粒子的粒径，这实际上与通过XRD获得的粒径相同。光致发光（PL）研究表明，ZnS样品给出了一个具有斯托克频移的单峰。对于未封端的纳米颗粒，在460 nm处获得PL发射峰。具有不同封端剂浓度的ZnS纳米粒子的PL光谱表明，随着粒子尺寸的减小，发射变得更加强烈，并向蓝色转移。

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