11-巯基十一烷酸包裹的金纳米颗粒薄膜的二次电子发射

发布时间：2018-02-23 07:02

本文关键词： -巯基十一烷酸包裹的金纳米颗粒超晶格结构光电发射　出处：《核技术》2017年06期 　论文类型：期刊论文

【摘要】：采用改进的Peterk合成法合成11-巯基十一烷酸(Mercaptoundecanoic Acid,MUA)包覆的金纳米颗粒。通过调控MUA与氯金酸质量比,得到分布均匀且稳定性较好的不同粒径(3 nm)的纳米金颗粒前驱体溶液,进而滴加该溶液形成薄膜。扫描电子显微镜(Scanning Electron Microscope,SEM)观测到薄膜中具有大量微米级的块状集团。同步辐射掠入射X射线衍射(Grazing Incidence X-ray Diffraction,GIXRD)揭示其具有面外长程有序的超晶格结构;X射线光电子谱(X-ray Photoelectron Spectroscopy,XPS)证实薄膜中Au-S键的形成。通过紫外光电子能谱(Ultraviolet Photoelectron Spectroscopy,UPS)进一步发现常温下1.5 nm粒径的薄膜具有比单晶金样品强10倍的优异二次电子发射能力,且发射峰半高宽是单晶金样品的1/4。本研究表明,MUA包覆的金纳米薄膜在电子发射源以及光电探测上具有应用前景。
[Abstract]:The gold nanoparticles coated with Mercaptoundecanoic AcidMUAs were synthesized by an improved Peterk synthesis method. By regulating the mass ratio of MUA to chloro gold acid, a homogeneous and stable precursor solution of gold nanoparticles with different particle sizes was obtained. Scanning electron microscopy (SEM) observed a large number of micron clusters in the films. Synchrotron radiation grazing incident X-ray diffraction (Incidence) grazing Incidence X-ray DiffractionGIXRD revealed that the films had an out-of-plane long term order. The formation of Au-S bonds in the films was confirmed by X-ray Photoelectron spectroscopy (XPS). It was further found that the thin films with a diameter of 1.5 nm at room temperature have excellent secondary electron emission ability, which is 10 times greater than that of single crystal gold samples. The half-maximum width of the emission peak is 1 / 4 of that of the single crystal gold sample. This study shows that the gold nanocrystalline films coated with MUA have promising applications in electron emission source and photoelectric detection.
【作者单位】：中国科学院上海应用物理研究所;中国科学院大学;中国科学院微观界面物理与探测重点实验室;
【基金】：国家自然科学基金(No.11175239、No.11405257、No.U1332205、No.21203235、No.21303147) 上海市科委项目(No.14DZ2261200)资助~~
【分类号】：TB383.1

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