有机掺杂溶胶-凝胶法制备pH敏感膜及其光谱响应的研究

pH Sensors Based on Rubbery Ormosils Preparation and Their Spectrum Studies

使用四甲氧基硅烷 (TMOS)和二甲基二甲氧基硅烷 (DiMe DMOS)为共先驱体 ,采用溶胶 凝胶的有机掺杂 ,制备对 pH具有宽程响应的敏感膜。详细考察了包埋溴酚蓝和溴酚绿的敏感膜对 pH的响应值、响应时间、泄漏和可逆性等响应性能指标 。

A new type of methyl substitued ormosils as a matrix for bromophenol blue (BPhB) and bromocresol green (BCG) is described. The new ormosils combine features of classical TEOS sol-gel material such as solvbility in organic solvent and those of sol-gel glasses such as transparent and a porous structure, the ormosils also make a good mechanical stability. The influene of the conditions during the polymerisation process on the photochemical properties of BPhB and BCG has been studied. This sol-gel material was wed to immobilize pH-sensitive absorption dyes, bromothymol blue and bromocresol green, to prepare pH sensing films. The several aspects of the sensing films, including the leaching of the dye from gel, response time to different pH buffer solution, absorption spcetra and the improvement of the immobilization of the dyes to filmo, were also discussed.