热处理增强Au纳米颗粒超薄膜光电子发射的研究

王菲; 程振东; 张晓楠; 杨迎国; 高兴宇

doi:10.11889/j.0253-3219.2017.hjs.40.120102

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热处理增强Au纳米颗粒超薄膜光电子发射的研究

同步辐射技术及应用 | 更新时间：2021-05-19

- 热处理增强Au纳米颗粒超薄膜光电子发射的研究
- Annealing-enhanced photoelectron emission from ultra-thin Au nanoparticle film
- 核技术 2017年40卷第12期文章编号：120102
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院大学北京 100049
- 作者简介：
  
  [ "王菲, 女, 1988年出生, 2010年毕业于上海大学, 现为博士研究生, 主要从事烷基硫醇包裹金纳米粒子的薄膜制备及其光电子发射的研究", "WANG Fei, female, born in 1988, graduated from Shanghai University in 2010, doctoral student, focusing on the preparation and photoelectron emission research of Au nanoparticle films" ]
  杨迎国, E-mail:yangyingguo@sinap.ac.cn YANG Yingguo, ,E-mail:yangyingguo@sinap.ac.cn
  高兴宇, E-mail:gaoxingyu@sinap.ac.cn GAO Xingyu, E-mail:gaoxingyu@sinap.ac.cn
- 基金信息：
  
  国家自然科学基金(11175239);国家自然科学基金(11605278);国家自然科学基金(11675252)
- DOI：10.11889/j.0253-3219.2017.hjs.40.120102
  中图分类号： TL99
- 收稿日期：2017-09-22，
  
  修回日期：2017-10-11，
  
  纸质出版日期：2017-12-10
- 稿件说明：
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王菲, 程振东, 张晓楠, 等. 热处理增强Au纳米颗粒超薄膜光电子发射的研究[J]. 核技术, 2017,40(12):120102

Fei WANG, Zhendong CHENG, Xiaonan ZHANG, et al. Annealing-enhanced photoelectron emission from ultra-thin Au nanoparticle film[J]. Nuclear techniques, 2017, 40(12): 120102
王菲, 程振东, 张晓楠, 等. 热处理增强Au纳米颗粒超薄膜光电子发射的研究[J]. 核技术, 2017,40(12):120102 DOI： 10.11889/j.0253-3219.2017.hjs.40.120102.

Fei WANG, Zhendong CHENG, Xiaonan ZHANG, et al. Annealing-enhanced photoelectron emission from ultra-thin Au nanoparticle film[J]. Nuclear techniques, 2017, 40(12): 120102 DOI： 10.11889/j.0253-3219.2017.hjs.40.120102.

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 ForceMicroscopy，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℃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

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.

关键词

Keywords

references

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