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

Zhendong CHENG; Gengwu JI; Fei WANG; Xiaonan ZHANG; Yingguo YANG; Jihao LI; Wen WEN; Xingyu GAO

doi:10.11889/j.0253-3219.2017.hjs.40.060101

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

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | 更新时间：2021-05-19

- Enhanced secondary electron emission from 11-mercaptoundecanoic acid-stabilized Au nanoparticle film
- NUCLEAR TECHNIQUES Vol. 40, Issue 6, Article number: 060101(2017)
- 作者机构：
  
  1.中国科学院上海应用物理研究所张江园区上海 201204
  2.中国科学院大学北京 100049
  3.中国科学院微观界面物理与探测重点实验室上海 201800
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China;National Natural Science Foundation of China;National Natural Science Foundation of China;National Natural Science Foundation of China;National Natural Science Foundation of China;Science and Technology Commission of Shanghai Municipality
- DOI：10.11889/j.0253-3219.2017.hjs.40.060101
  CLC： TL99
- Received：21 February 2017，
  
  Revised：17 March 2017，
  
  Published：10 June 2017
- 稿件说明：
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Zhendong CHENG, Gengwu JI, Fei WANG, et al. Enhanced secondary electron emission from 11-mercaptoundecanoic acid-stabilized Au nanoparticle film[J]. Nuclear techniques, 2017, 40(6): 060101
DOI：

Zhendong CHENG, Gengwu JI, Fei WANG, et al. Enhanced secondary electron emission from 11-mercaptoundecanoic acid-stabilized Au nanoparticle film[J]. Nuclear techniques, 2017, 40(6): 060101 DOI： 10.11889/j.0253-3219.2017.hjs.40.060101.

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

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.

关键词

Keywords

references

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