Hermetically carbon-coated optical fibers prepared by thermal chemical vapor deposition：effects of different acetylene/nitrogen ratios, temperatures, pressures, and flow rates on the properties of carbon coatings

• Main Authors: Ren-Hong Lee, 李任弘
• Other Authors: 薛顯宗
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/ev53qt

碩士 === 國立中興大學 === 材料科學與工程學系所 === 97 === This study investigates the effects of C2H2/(N2+C2H2) ratios, deposition temperatures, deposition pressures and deposition flow rates on the properties of carbon coatings on optical fibers prepared by thermal chemical vapor deposition. The surface morphology, microstructure, coating thickness, surface property, and electrical property of carbon coatings were investigated by optical microscopy, X-ray diffraction spectrometer, Raman scattering spectrometer, X-ray photoelectron spectrometer, field emission scanning electron microscopy, atomic force microscopy, contact angle meter, four point probe method, and nanoindenter. The results indicate that the deposition rate, surface roughness, and the electrical resistivity of the carbon coatings increase as the C2H2/(N2+C2H2) ratio, deposition temperature, deposition pressure increase or deposition flow rates decrease, while the degree of ordering, the mean crystallite size (Lc), in-plane crystallite size (La), water-repellency and mechanical properties of the carbon coating decrease. Additionally, based on the low-temperature surface morphology of the carbon coatings, the carbon coating deposited with coatings thickness greater than 289 nm is the best for use as the hermetical optical fiber coating.