纳米材料表面效应的研究

Study of the surface effect on nanomaterials

利用表面效应增强纳米材料的发光性能。通过扫描电镜、光致发光等方法深入研究了表面修饰对ZnO纳米材料发光性能的影响。在ZnO纳米带上溅射Au纳米颗粒,可有效增强其近带边发光,并使可见发光强度发生淬灭,从而增强ZnO纳米带的发光性能,紫外发光与深能级发光的强度比增加到111.0。利用退火处理改变了界面处Au纳米颗粒的分布,详细地探讨了Au-ZnO复合材料的发光机制。

Enhancement of the light emission of nanomaterials was observed by surface effect. The effect on the photoluminescence of Au - ZnO composite nanobelts by surface plasmon was systematically investigated by the scanning electron microscopy and photoluminescence spectrum. By sputtering Au nanoparticles onto ZnO nanobe-lts ,the ultraviolet/deep level emission intensity ratio increases to 111. 0, while the defect emission was quenched, indicating significantly improved excitonic emission efficiency. We also turned the distribution of Au NPs by rapid thermal processing. Then the enhancement and attenuation mechanisms were discussed in detail. It should be helpful in understanding the mechanism of surface plasmons coupling.