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首页> 外文期刊>Measurement Science & Technology >Acidity sensor based on porphyrin self-assembled monolayers covalently attached to the surfaces of tapered fibres
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Acidity sensor based on porphyrin self-assembled monolayers covalently attached to the surfaces of tapered fibres

机译：基于卟啉自组装单层共价附着于锥形纤维表面的酸度传感器

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Surface organization and photochemistry of free-base porphyrin self-assembled monolayers (SAMs) covalently bonded to the surfaces of tapered optical fibres and reference glass plates were studied. The surface modification was carried out in two steps: (i) surface activation by aminopropyltrimethoxysilane and (ii) porphyrin attachment via activated pentafluorophenyl esters. The measurements of surface activation time and real-time porphyrin adsorption monitoring revealed that each of the two steps required 1 h reaction time. Porphyrin immobilization on fibres was as good as on plane glass substrates. Fluorescence measurements were used to determine the optimum diameter of the coned part of the tapered fibre for sensor applications. For 125 (mu)m fibres with a 10 (mu)m cladding layer, this diameter was found to be 35-48 (mu)m. The mono- and diprotonated forms of free-base porphyrin have distinct fluorescence spectra. This phenomenon was employed to demonstrate a pH sensor application of the SAM-modified tapered fibre, which operates in the pH range of 0.6-3.8.
机译：研究了共价键合到锥形光纤和参考玻璃板表面的游离碱卟啉自组装单分子膜（SAMs）的表面组织和光化学。表面改性分两个步骤进行：（i）通过氨基丙基三甲氧基硅烷进行表面活化和（ii）通过活化的五氟苯基酯进行卟啉连接。表面活化时间和实时卟啉吸附监测的测量表明，两个步骤中的每个步骤都需要1小时的反应时间。卟啉固定在纤维上的效果与平面玻璃基材上的一样好。使用荧光测量来确定用于传感器应用的锥形纤维的锥形部分的最佳直径。对于具有10μm包层的125μm光纤，发现该直径为35-48μm。游离碱卟啉的单质子化和双质子化形式具有不同的荧光光谱。该现象用于证明SAM改性锥形纤维的pH传感器应用，该传感器在0.6-3.8的pH范围内工作。

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