Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (12): 120102-120102.doi: 10.11889/j.0253-3219.2017.hjs.40.120102


Annealing-enhanced photoelectron emission from ultra-thin Au nanoparticle film

WANG Fei1,2, CHENG Zhendong1,2, ZHANG Xiaonan1,2, YANG Yingguo1,2, GAO Xingyu1,2   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-09-22 Revised:2017-10-11 Online:2017-12-10 Published:2017-12-08
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11175239, No.11605278, No.11675252), One Hundred Talents Project of Chinese Academy of Sciences

Abstract: Background: Ligated Au nanoparticle (Au NP) thin films show enhanced photoemission due to the fact that Au-S chemical bonding significantly improves the Au NP-ligand interface transmission probability. Purpose: This study aims to investigate how annealing influences the secondary electron photoemission from ultra-thin ligated Au NP films. Methods: Transmission electron microscopy (TEM), atomic force microscopy (AFM), scanning electron microscopy (SEM), synchrotron-based grazing incidence X-ray diffraction (GIXRD), and ultraviolet photoelectron spectroscopy (UPS) were employed to study size distribution of ligated Au NP, surface morphology, elemental compositions, microstructure of the film, and photoelectron emission from the film, respectively. Results: Mercaptoundecanoic acid (MUA) ligated Au NP with an average diameter of~1.4 nm was used to fabricate ultrathin film with a thickness of 10 nm. AFM and SEM results showed that Au NP was distributed well and the film was quite smooth. Using SEM, it was found that S composition became less with increasing annealing temperature. UPS spectra revealed that the secondary electron photoemission peak from Au NP film after annealing at 150℃ was about 4 times larger than that of thin film without annealing. However, annealing at an even higher temperature caused a dramatic decrease of secondary electron photoemission. Conclusion: The present study demonstrated that an annealing at a proper elevated temperature enhanced the secondary electron photoemission from ultrathin MUA ligated Au NP films, which would promote applications of the ligated Au NP films as promising photoelectron-emission materials for photoelectron devices.

Key words: Au nanoparticles, Ultrathin film, Photoelectron emission, Annealing

CLC Number: 

  • TL99