Abstract
A silver thin film based fiber optic plasmonic sensor for the detection of phenolic analyte, catechol, is elicited in the present study. The sensor relies on the interaction of catechol with cetyltrimethyl ammonium bromide (CTAB) functionalized zinc oxide/carbon nanotubes (ZnO/CNTs) nanocomposite coated over the silver film. A simple sol gel method is reported for the synthesis of the nanocomposite. The morphological, elemental and structural characterizations of the nanocomposite are confirmed by various microscopic and spectroscopic techniques. The sensor’s performance is studied for the catechol concentration range 0 to 100 µM. The fabricated probe shows efficiency in a very wide pH range depending on the concentration of CTAB utilized in the preparation of the probe. Various operational parameters are adjusted to obtain the optimum sensor performance. Efficiently reproducible and selective performance is obtained after analyzing various possible interferands like dopamine, ascorbic acid (AA), hydrazin...
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