Carbon-coated optical fibers prepared by plasma enhanced chemical vapor deposition method:effect of hydrogen/methane ratio

• Main Authors: Hsiu-Hsien Hsiao, 蕭修賢
• Other Authors: Sham-Tsong Shiue
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/7pf6hp

碩士 === 逢甲大學 === 材料科學所 === 90 === Hermetically carbon-coated optical fibers were prepared by Plasma enhanced chemical vapor deposition. The effect of hydrogen/methane ration on properties of carbon coatings with thickness 100 nm was researched. During the experiment, the structures and surface roughness of carbon coatings were determined by Laser Raman Spectrometry and atom force microscopy, respectively. Then, the tensile strengths of carbon-coated optical fibers were measured by the tensile machine. Finally, carbon-coated optical fibers were immersed in the liquid nitrogen for one day and stress induced cracks on the surface of carbon coatings were observed using the optical microscope. As a result, because of the increase of hydrogen/methane ratio, the effect of hydrogen etching advantaged the growth of diamond-like phase and decreased the surface roughness of carbon coatings. Alternatively, the tensile strength increased with hydrogen/methane ratio increased, but the density of stressed cracks decreased with hydrogen/methane ratio increased. From this experiment, we also found the changes of the density of stressed cracks and tensile strength were effected by structures and surface roughness of carbon coatings.