| Summary: | 碩士 === 國立臺灣科技大學 === 高分子系 === 95 === A study examined the chemical properties and microstructure of continuous silver-sputtered viscose rayon-based activated carbon fabrics (ACF). Viscose rayon-based knitted fabrics were first immersed in composite flame retardant reagent (ammonium sulfate and di-ammonium hydrogen phosphate at a ratio of 95:5) to become the precursor. The pre-treated fabrics were then fed into an erect high-temperature furnace at a constant rate of 20cm/min and underwent a series of oxidization, carbonization and activation under steam and air to produce ACF with good absorption and large BET surface area. The ACF were further processed by supporting silver into ACF-Ag under different concentrations of silver nitric and different decomposition temperatures to examine the distribution of silver particles, the restoration capacity of silver ions into metal silver and Linking type
Experimental results showed that the ACF before silver sputtering had BET surface area exceeding 2000m2/g, absorption rate of CCl4 reaching 98%, a higher ratio of functional groups containing oxygen and the maximum carbon content. After silver sputtering, the original ESCA showed peak signals of silver, indicating that the silver ions had indeed restored into metal silver. Comparing the overlay of functional groups revealed that viscose rayon-based ACF was composed mainly of -C-H, followed by -OH. ACF-Ag was also found to have lower isotherm and reduced BET surface area of 1776m2/g. SEM analysis revealed that under decomposition temperature of 400�aC and silver nitric concentrations of 0.1M, the silver particles were of smaller size and more even distribution. ESCA testing results also showed that the more the functional groups containing oxygen and the higher the 【O】/【C】and 【Ag】/【C】ratios, the better the restoration capcity of silver ions into metal silver was.
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