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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
[ "程振东, 男, 1990年出生, 2014年毕业于河南科技大学, 现为硕士研究生, 主要从事纳米金颗粒薄膜的制备以及性能测试研究", "CHENG Zhendong, male, born in 1990, graduated from Henan University of Science and Technology in 2014, master student, mainly engaged in the preparation of nano-gold particles thin film and performance testing" ]
文闻, E-mail:wenwen@sinap.ac.cn WEN Wen, E-mail:wenwen@sinap.ac.cn
高兴宇, E-mail:gaoxingyu@sinap.ac.cn GAO Xingyu, E-mail:gaoxingyu@sinap.ac.cn
收稿日期:2017-02-21,
修回日期:2017-03-17,
纸质出版日期:2017-06-10
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程振东, 季庚午, 王菲, 等. 11-巯基十一烷酸包裹的金纳米颗粒薄膜的二次电子发射[J]. 核技术, 2017,40(6):060101
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
程振东, 季庚午, 王菲, 等. 11-巯基十一烷酸包裹的金纳米颗粒薄膜的二次电子发射[J]. 核技术, 2017,40(6):060101 DOI: 10.11889/j.0253-3219.2017.hjs.40.060101.
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.
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。
Background
2
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
2
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
2
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
2
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
2
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.
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