Ion irradiation induced structural modifications and increase in elastic modulus of silica based thin films [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2017. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- Article numbers 40,100 : digital, PDF file
- Additional Creators:
- Los Alamos National Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, United States. National Nuclear Security Administration, National Science Foundation (U.S.), and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Ion irradiation is an alternative to heat treatment for transforming organic-inorganic thin films to a ceramic state. One major shortcoming in previous studies of ion-irradiated films is the assumption that constituent phases in ion-irradiated and heat-treated films are identical and that the ion irradiation effect is limited to changes in composition. Here, we investigate the effects of ion irradiation on both the composition and structure of constituent phases and use the results to explain the measured elastic modulus of the films. Our results indicated that the microstructure of the irradiated films consisted of carbon clusters within a silica matrix. It was found that carbon was present in a non-graphitic sp<sup>2</sup>-bonded configuration. It was also observed that ion irradiation caused a decrease in the Si-O-Si bond angle of silica, similar to the effects of applied pressure. A phase transformation from tetrahedrally bonded to octahedrally bonded silica was also observed. The results indicated the incorporation of carbon within the silica network. Finally, a combination of the decrease in Si-O-Si bond angle and an increase in the carbon incorporation within the silica network was found to be responsible for the increase in the elastic modulus of the films.
- Published through SciTech Connect., 01/10/2017., "la-ur--17-27527", Scientific Reports 7 ISSN 2045-2322 AM, and S. A. Shojaee; Y. Qi; Y. Q. Wang; A. Mehner; D. A. Lucca.
- Funding Information:
- AC52-06NA25396, OISE-0352377, and OISE-0128050
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