热处理增强Au纳米颗粒超薄膜光电子发射的研究

发布时间：2018-08-12 15:54

【摘要】：本文制备了平均直径为1.4 nm的11-巯基十一烷酸(Mercaptoundecanoic acid,MUA)修饰的金纳米颗粒,随后通过硅晶片上壳聚糖薄涂层静电吸附制备了厚度约为10 nm的超薄膜,原子力显微镜(Atomic Force Microscopy,AFM)和扫描电子显微镜(Scanning Electron Microscopy,SEM)表明金纳米颗粒在薄膜中分布较为均匀且薄膜较平整。进一步采用紫外光电子能谱(Ultraviolet Photoelectron Spectroscopy,UPS)研究了不同热处理温度对超薄膜的二次电子发射能力的影响。结果表明,适度的热处理有助于超薄膜二次电子发射强度的提高,尤其是经150°C热处理的薄膜二次电子发射峰强是未处理样品的4倍,更高的热处理温度造成二次电子发射峰强度急剧下降。本文结果有助于推动有机配体金纳米颗粒超薄膜在光电子发射材料方面的应用。
[Abstract]:In this paper, the gold nanoparticles modified by Mercaptoundecanoic acidanilic acid (Mercaptoundecanoic acido MUA) with an average diameter of 1. 4 nm were prepared, and then the ultrathin film was prepared by electrostatic adsorption of chitosan thin coating on silicon wafer, the thickness of which was about 10 nm. Atomic force microscope (AFM) and scanning electron microscope (Scanning Electron) showed that the gold nanoparticles distributed uniformly in the films and the films were flat. The effect of different heat treatment temperature on the secondary electron emission ability of ultrathin films was further studied by (Ultraviolet Photoelectron spectroscopic UPS. The results show that moderate heat treatment can improve the secondary electron emission intensity of ultrathin film, especially the peak intensity of secondary electron emission of the film treated with 150 掳C is 4 times that of the untreated sample. The higher heat treatment temperature results in a sharp decrease in the intensity of the secondary electron emission peak. The results in this paper are helpful to promote the application of organic ligand gold nanoparticles ultrathin films in photoelectron emission materials.
【作者单位】：中国科学院上海应用物理研究所嘉定园区;中国科学院大学;
【基金】：国家自然科学基金(No.11175239、No.11605278、No.11675252) 中国科学院百人计划资助~~
【分类号】：O484

【相似文献】