Abstract

A photochemical fiber-optic sensor was developed by integrating a plastic optical fiber (POF), polymer membrane, gold mirror, and ${\mathrm{TiO}}_2$-based composite, and was shown to sensitively and selectively detect phenol in aqueous solution. The sensing element consisted of a thinned POF and visible-light-driven ${\mathrm{SiO}}_2/\mathrm{N}$-doped ${\mathrm{TiO}}_2$ coating. The gold mirror was used to develop a reflective POF probe. The polymer membrane with high phenol permselectivity was employed to form a micro-channel between the membrane and probe. Our findings highlight the sensor’s capability of phenol detection in aqueous solutions with high sensitivity of $0.294\times {10}^{-3}{(\mathrm{mg}·{\mathrm{L}}^{-1})}^{-1}$, pH immunity ranging from 2.0 to 14.0, and high selectivity with a limit of detection of $30\mathrm{\mu g}·{\mathrm{L}}^{-1}$.

© 2019 Optical Society of America

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