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首页> 外文期刊>Applied Surface Science >Optical characterization of CdS semiconductor nanoparticles capped with starch
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Optical characterization of CdS semiconductor nanoparticles capped with starch

机译：淀粉包覆的CdS半导体纳米粒子的光学表征

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Starch capped cadmium sulfide (CdS) nanoparticles were synthesized by aqueous solution precipitation. Starch added during the synthesis of nanoparticles resulted in cadmium-rich nanoparticles forming a stable complex with starch. The size of the CdS quantum dots was measured using high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD). The average diameter (d) of nanoparticles spanned the range 4.8 ± 0.4 to 5.7 ± 0.2 nm when the pH of the solution was varied within the range 10-14. The main Raman phonon of CdS, the longitudinal optical mode located around 300 cm~(-1), softens as diameter decreases, in accordance with theoretical predictions. In addition, the largest Raman response of starch, near 478 cm~(-1), related with the important skeletal vibration modes of the starch pyra-nose ring, dominates the spectra of the CdS capped nanoparticles and also softens as the size decreases. This fact indicates a strain variation on CdS as a function of d which increases as the pH increases.
机译：通过水溶液沉淀法合成了淀粉封端的硫化镉（CdS）纳米颗粒。在纳米粒子的合成过程中添加的淀粉导致富含镉的纳米粒子与淀粉形成稳定的复合物。使用高分辨率透射电子显微镜（HRTEM）和X射线衍射（XRD）测量CdS量子点的大小。当溶液的pH在10-14范围内变化时，纳米粒子的平均直径（d）跨越4.8±0.4至5.7±0.2nm的范围。根据理论预测，CdS的主要拉曼声子（位于300 cm〜（-1）附近的纵向光学模式）随着直径的减小而软化。此外，淀粉的最大拉曼响应（接近478 cm〜（-1））与淀粉吡咯-鼻环的重要骨架振动模式有关，主导了CdS封端的纳米颗粒的光谱，并且随着尺寸的减小而软化。这一事实表明，CdS的应变随d的变化而变化，随pH的增加而增加。

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