OPTICAL PROPERTIES OF DLC/POLYIMIDE STRUCTURES IRRADIATED WITH 60CO γ-QUANTA
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Abstract
The transmission spectrum measurement methods were used to study the DLC/polyimide structures irradi-ated with 60Co γ-quanta with a dose of up to 1 MGy and formed by the method of high-current pulsed magnetron sputtering of GL-1 graphite. The absorbed dose rate was 0,12 Gy/s. An increase in transmission near the absorption edge of the polyimide film and DLC/polyimide structures during γ-quanta irradiation was experimentally established. This effect is more pronounced in the DLC/polyimide structures and is caused by both the decay of meta-stable "growth" defects in the polyimide base and the restructuring of the DLC coating. A change in the reflection spectra of the DLC coating during γ-irradiation was detected, which is manifested in a decrease in the reflection coefficient with an increase in the irradiation dose. At a 1 MGy irradiation dose in the wavelength range from 200 to 300 nm, a decrease in the reflectivity with increasing wavelength was observed, while in the original (non-irradiated) structures in the specified range, an increase in the reflectivity was observed. Most likely, this is due to the rearrangement of the DLC structure during irradiation, which is consistent with the change in the αλd value. It is shown that optical spectroscopy is an effective method for detecting thin DLC films, when it is impossible to observe such coatings by other methods. Weakening of the adhesion of the DLC coating to the polyimide substrate, up to peeling off at 1 MGy, was detected.
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