The study of hermetically carbon-coated optical fibers prepared by thermal chemical vapor deposition using acetylene gas.

• Main Authors: Hsun-Yu Lin, 林訓瑜
• Other Authors: 薛顯宗
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/51878901132366835288

碩士 === 國立中興大學 === 材料科學與工程學系 === 96 === The effects of the deposition temperature and coating thickness on the properties of hermetically carbon-coated optical fibers are investigated. Hermetically carbon-coated optical fibers are prepared by thermal chemical vapor deposition using acetylene as the precursor gas. The chemical bonding, microstructure, cross-section images, surface roughness, mechanical properties, and morphologies are measured by X-ray photoelectron spectrometer, Raman scattering spectrometer, field emission scanning electron microscopy, atomic force microscopy, Nanoindenter, and optical microscopy. The water-repellency and low-temperature surface morphology of carbon-coated optical fibers are elucidated. Results show that the deposition rate and surface roughness of carbon coatings increase as the deposition temperature increase from 700 to 740 ºC, while the in-plane crystal size of carbon coatings, the water contact angle, the hardness and Young’s modulus decrease. The carbon coating becomes graphite structure as the deposition temperature increase. On the other hands, the number and size of particles increase with the coating thickness, while the degree of structural ordering, the in-plane crystal size of carbon coatings, and the water contact angle decrease. The bonding form of carbon coatings are not changed for different the coating thicknesses. Additionally, base on the water-repellency and low-temperature surface morphology of the carbon coatings, the carbon coating that is deposited at a temperature of 715 ºC with coating thickness of 141 nm is the best for use as the hermetical optical fiber coating.