| Summary: | 碩士 === 國立清華大學 === 材料科學工程學系 === 105 === Diamond has attracted tremendous attention owing to its outstanding mechanical and optical properties. This work reports preparation of diamond films on commercial glass substrates to enhance their wear resistance. In order to increase nucleation sites for promoting growth of diamond films, pretreatment of the glass substrates is carried out by ultrasonication. Two types of diamond films, including microcrystalline diamond (MCD) and nanocrystalline diamond (NCD), are prepared on the pretreated glass substrates by microwave plasma-enhanced chemical vapor deposition. The study on abrasion test reveals that NCD sample grown under the hydrogen atmosphere with a concentration of 30 % (assigned as NCD30) possesses strongest wear resistance.
Ultraviolet visible (UV-Vis) spectroscopy measurement indicates the NCD30 sample with a thickness of 600 nm exhibits highest transmittance of ~75% in visible region. It is also found that transmittance of the MCD is much lower than that of NCD under the same thickness, possibly attributing to rough surfaces of MCD causing a strong light scattering.
Moreover, we find that an additional spin-coated polyimide (PI) thin film on the opposite side of the glass substrate results in significant reduction in transmittance of the sample at a wavelength of 350 nm. Our study therefore demonstrates that the NCD films not only provide extra wear resistance to glass substrate but also possess high potential for applications in anti-UV and blue light 3C screen protector when collaborate with PI coating.
|
|---|
