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首页> 外文期刊>Journal of nanoscience and nanotechnology >The Effect of Polymer Matrices in the In-Situ CdS Formation Under UV Irradiation of Precursor-Polymer Films
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The Effect of Polymer Matrices in the In-Situ CdS Formation Under UV Irradiation of Precursor-Polymer Films

机译：前体-聚合物薄膜紫外线照射下聚合物基体在原位CdS形成中的作用

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摘要

Polymer films embedding cadmium thiolate precursors have been irradiated with ultraviolet laser pulses resulting in the formation of cadmium sulfide crystalline nanoparticles through a macroscopically non-destructive procedure for the host matrix. Controlling the number of the incident laser pulses, the gradual increase of the size of the nanoparticles is accomplished, and consequently the progressive change of the emission characteristics of the formed nanocomposites. The X-ray diffraction and transmission electron microscopy measurements were used for the full characterization of the nanoparticles. This study compares two polymer matrices, poly(methyl methacrylate) and a cyclic olefin copolymer, and reveals the importance of each one for the emission characteristics of the formed cadmium sulfide nanocrystals. It is found that the poly(methyl methacrylate) matrix contributes to the increase of the trap states on the surface of the formed nanocrystals, causing the broadening of their emission. On the other hand the cadmium sulfide nanoparticles, grown into the cyclic olefin copolymer matrix, exhibit narrower emission spectra.
机译：嵌入硫醇镉前体的聚合物薄膜已被紫外线激光脉冲照射，从而通过宏观无损的基质形成硫化镉结晶纳米颗粒。通过控制入射激光脉冲的数量，纳米颗粒尺寸的逐渐增加得以实现，因此所形成的纳米复合材料的发射特性逐渐变化。 X射线衍射和透射电子显微镜测量用于纳米颗粒的完整表征。这项研究比较了两种聚合物基质，聚（甲基丙烯酸甲酯）和一种环状烯烃共聚物，并揭示了每种对于形成的硫化镉纳米晶体的发射特性的重要性。发现聚（甲基丙烯酸甲酯）基体有助于所形成的纳米晶体表面上的陷阱态的增加，导致其发射变宽。另一方面，生长到环状烯烃共聚物基质中的硫化镉纳米颗粒显示出较窄的发射光谱。

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