What is it about?
A selective oxidation technique for diamond films based on the extended exposure to UV light in air at room temperature was developed and studied by Raman Spectroscopy and Scanning Electron Microscopy.
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Why is it important?
The diamond films were synthesized by the combustion flame technique in open atmosphere by using an oxy-acetylene gas mixture as the carbon source. A 125 W UV lamp was used to irradiate the films in the wavelength range of 180–250 nm, from 2 to 10 days.
Perspectives
After UV irradiation, graphite was selectively oxidized and partially removed without oxidation of diamond, indicating that the strong reaction of ozone (O3) and atomic oxygen (O·) produced by the UV irradiation oxidized the graphite, even at room temperature, without the need of an additional heating source. The oxidation of graphite was best observed after 2 days of UV treatment. A sensible improvement in the diamond film quality was obtained after 2 days of irradiation, as revealed by the sharpening of the corresponding Raman band.
Dr. Alejandro Castañeda-Miranda
Creativity and Innovation Center 4.0 (CIC 4.0), Technological University of Queretaro (UTEQ)
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This page is a summary of: , Inorganic Materials, January 2002, Springer Science + Business Media,
DOI: 10.1023/a:1013695226044.
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