Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (6): 60101-060101.doi: 10.11889/j.0253-3219.2017.hjs.40.060101

• SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS •     Next Articles

Enhanced secondary electron emission from 11-mercaptoundecanoic acid-stabilized Au nanoparticle film

CHENG Zhendong1,2, JI Gengwu1,2, WANG Fei1,2, ZHANG Xiaonan1,2, YANG Yingguo1,2, LI Jihao1, WEN Wen1,3, GAO Xingyu1,3   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Zhangjiang Campus, Shanghai 201204, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2017-02-21 Revised:2017-03-17 Online:2017-06-10 Published:2017-06-06
  • About author:10.11889/j.0253-3219.2017.hjs.40.060101
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11175239, No.11405257, No.U1332205, No.21203235, No.21303147), Science and Technology Commission of Shanghai Municipality (No.14DZ2261200)

Abstract: Background:Functionalized gold nanoparticles with unique localized surface plasmon resonance (LSPR) effects can be used as building blocks for constructing 3D structures towards novel nanoscale electronic or electro-optic devices. Purpose:In this work, we aim to study the structure and photoemission property relationship of the film of 11-mercaptoundecanoic acid-stabilized Au nanoparticles with a diameter less than 3 nm. Methods:Au nanoparticles stabilized by 11-mercaptoundecanoic acid (MUA) with a diameter less than 3 nm are prepared following a modified Peterk's method which is deposited on Cu substrate to prepare thin film. The as-prepared films are characterized by X-ray photoelectron spectroscopy (XPS), ultraviolet photoemission spectroscopy (UPS), transmission electron microscopy (TEM), and grazing incidence X-ray diffraction (GIXRD). Results:As shown by the scanning electron microscope (SEM) images, the obtained films of Au nanoparticle with a diameter of 1.8 nm are consisted of micron size blocks. Fourier transform infrared spectroscopy (FT-IR) and XPS indicate that Au-S bonds are successfully formed. Moreover, GIXRD studies show that superlattice structure with strong preferred out-of-plane orientation is formed in the obtained 1.8-nm Au nanoparticle film. While the secondary electron peaks observed in UPS spectrum of all these Au nanoparticles films (with a diameter less than 3 nm) are much stronger than that of Au(111) reference sample, the peak of the 1.5-nm nanoparticle film is the strongest, and is about 10 times of that of Au(111) reference sample. Conclusion:In this study, the film of 1.5-nm MUA-stabilized Au nanoparticles exhibited most enhanced photoemission intensity and had the potential applications in electron sources and photo detectors.

Key words: MUA-stabilized Au nanoparticles thin film, Superlattice, Photoemission

CLC Number: 

  • TL99