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Formation Mechanism of Molybdenum and Molybdenum Oxide Nanoparticles by Electron Irradiation

Published online by Cambridge University Press:  21 March 2011

Husheng Jia ,
Bingshe Xu ,
Yadi Fan ,
Ruiping Guo  and
Shun-ichiro Tanaka
Husheng Jia
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, China, 030024
Bingshe Xu
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, China, 030024
Yadi Fan
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, China, 030024
Ruiping Guo
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, China, 030024
Shun-ichiro Tanaka
Affiliation:
Department of Quantum Engineering and Systems Science, School of Engineering, The University of Tokyo, Tokyo, Japan, 113-8656
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Abstract

The mechanism of molybdenum and molybdenum oxide nanoparticles formation from molybdenum oxide microparticles by electron beam irradiation using a high-resolution transmission electron microscope on a room-temperature stage have been investigated. It is found that, the microsized molybdenum oxide particles disintegrated to form nanosized molybdenum oxide particles by electron beam irradiation with an intensity of approximately 1021e/cm2 · sec. The molybdenum nanoparticles were formed from molybdenum oxide nanoparticles upon further electron irradiation. During the electron irradiation process, the surfaces and interfaces of molybdenum oxide nanoparticles suffered damage and defects, such as vacancy arrays showing hole like spots and a moire-like fringes in the lattice image due to oxygen loss, followed by a gradual change from molybdenum oxide to molybdenum nanoparticles. The phenomenon of molybdenum metal nanoparticle formation from nanosized molybdenum oxide is considered to be due to desorption of oxygen as a result of electron stimulation and atomic displacement via the knock-on effect. It is suggested that electron irradiation is a powerful technique to create nanostructured metal, ceramic and semiconductor materials by atomic-scale control.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y3.4
Copyright
Copyright © Materials Research Society 2001

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References

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