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Photoluminescent zinc oxide polymer nanocomposites fabricated using picosecond laser ablation in an organic solvent

机译:在有机溶剂中使用皮秒激光烧蚀制备的光致发光氧化锌聚合物纳米复合材料

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摘要

Nanocomposites made of ZnO nanoparticles dispersed in thermoplastic polyurethane were synthesized using picosecond laser ablation of zinc in a polymer-doped solution of tetrahydrofuran. The pre-added polymer stabilizes the ZnO nanoparticles in situ during laser ablation by forming a polymer shell around the nanoparticles. This close-contact polymer shell has a layer thickness up to 30 nm. Analysis of ZnO polyurethane nanocomposites using optical spectroscopy, high resolution transmission electron microscopy and X-ray diffraction revealed that oxidized and crystalline ZnO nanoparticles were produced. Those nanocomposites showed a green photoluminescence emission centred at 538 nm after excitation at 350 nm, which should be attributed to oxygen defects generated during the laser formation mechanism of the monocrystalline nanoparticles. Further, the influence of pulse energy and polymer concentration on the production rate, laser fluence and energy-specific mass productivity was investigated.
机译:在聚合物掺杂的四氢呋喃溶液中使用皮秒激光烧蚀锌合成了由分散在热塑性聚氨酯中的ZnO纳米颗粒制成的纳米复合材料。通过在纳米颗粒周围形成聚合物壳,预添加的聚合物在激光烧蚀过程中就位稳定了ZnO纳米颗粒。这种紧密接触的聚合物壳层的厚度最大为30 nm。 ZnO聚氨酯纳米复合材料的光谱,高分辨率透射电子显微镜和X射线衍射分析表明,氧化和结晶的ZnO纳米粒子的生产。这些纳米复合材料在350 nm激发后显示了以538 nm为中心的绿色光致发光发射,这应归因于在单晶纳米颗粒的激光形成机理中产生的氧缺陷。此外,研究了脉冲能量和聚合物浓度对生产率,激光注量和能量比批量生产的影响。

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