脉冲激光轰击连续制备C_（60）原位修饰金属纳米团簇杂化材料
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摘要
本文采用脉冲激光轰击浸于流动C_(60)／正己烷溶液中的不同金属靶，获得8种表面为C_(60)修饰的金属纳米团簇(M／C_(60))杂化材料，利用磁性分析筛选出3种(M/C_(60))进行进一步的研究。紫外-可见光谱、微区能谱扫描、高分辨率透射电镜分析、元素分析、热重-差示扫描量热等分析证实了C_(60)对金属纳米团簇表面的修饰；透射电镜分析可知，脉冲激光轰击制备的原生金属粒子是团簇级大小的，由于团簇粒子大的比表面能，很快金属团簇就团聚形成金属纳米粒子；XRD表明(M／C_(60))杂化材料非晶化程度很高，金属微粒表面修饰物为非晶态；荧光光谱表明C_(60)增强了金属溶胶的荧光强度，意味着C_(60)修饰金属纳米团簇使其表面电子浓度增加或离域范围扩大；磁性分析表明采用PLA/ISFL方法，在具有高温、高压和超高速剧冷微区的特殊条件下C_(60)对金属纳米团簇的修饰对(M／C_(60))杂化材料的磁学特性有明显的影响。
In this article, 8 hybrid materials (M/C_(60)) formed by C_(60) decorating surface of metal nanoclusters was prepared through pulsed laser ablation at the interface between metal solid target and a flowing fullerene solution of hexane and three of them was choosed to undertake a further study. UV-Vis, Energy dispersive spectroscopy, Element analysis, TG-DSC or TG-DTA indentify that surface of metal nanoclusters was decorated by C_(60); TEM results indicate that original particles being as large as the size of clusters soon aggregate to nano particles when they were prodused by pulsed laser ablation because of their large specific surface. XRD results reveal that the diffraction peaks of the samples have lower value and broader width than pristine metal powders, indicating that surface of metal nanoclusters is decorated by amorphous material. Fluorescence intensity of metal nanoclusters increases due to the introduction of C_(60), revealing that surface of these particles decorated by C_(60) result in increasing electron concentration or extending delocalization range in them. Magnetism tested by VSM indicates that high temperature, high pressure and very rapidly cooled microarea in the method of PLA/ISFL are of importance in affecting the magnetic property of the hybrid materials.
In this article, 8 hybrid materials (M/C_(60)) formed by C_(60) decorating surface of metal nanoclusters was prepared through pulsed laser ablation at the interface between metal solid target and a flowing fullerene solution of hexane and three of them was choosed to undertake a further study. UV-Vis, Energy dispersive spectroscopy, Element analysis, TG-DSC or TG-DTA indentify that surface of metal nanoclusters was decorated by C_(60); TEM results indicate that original particles being as large as the size of clusters soon aggregate to nano particles when they were prodused by pulsed laser ablation because of their large specific surface. XRD results reveal that the diffraction peaks of the samples have lower value and broader width than pristine metal powders, indicating that surface of metal nanoclusters is decorated by amorphous material. Fluorescence intensity of metal nanoclusters increases due to the introduction of C_(60), revealing that surface of these particles decorated by C_(60) result in increasing electron concentration or extending delocalization range in them. Magnetism tested by VSM indicates that high temperature, high pressure and very rapidly cooled microarea in the method of PLA/ISFL are of importance in affecting the magnetic property of the hybrid materials.
引文
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