Analyses of alcohols using a gold-deposited optical-fiber refractive index sensor system

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Abstract

A gold-deposited optical-fiber sensor system using surface plasmon resonance (SPR) without a rotation stage or spectrometer was constructed, and the system was tested for the quantitative analyses of various alcohols. The sensor was fabricated by depositing a thin (45 nm) gold film around the unclad core of an optical fiber. When a sample solution was introduced into the sensor cell, the intensity of the transmitted light through the sensor decreased and became constant within 0.4 min. The detection limit was less than 0.5%, v/v and a change of 0.0012 refractive index (RI) units in the refractivity of a methanol solution of phenethyl alcohol could be measured. A calibration curve with a correlation coefficient of 0.998 was obtained in the concentration range of 0 to 5%, v/v. The relative standard deviation was 2% in 5 repeated measurements of a 60%, v/v aqueous ethanol solution. Though the curves of the transmitted light intensities vs. the concentrations of 12 alcohols differed from each other, the curve of the transmitted light intensity vs. RIs of the alcohols had the minimum at about 1.37 RI units and the minimum shifted with increasing the thickness of the gold film. Thus, the properties of the sensor can be controlled by the thickness of the gold film.

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Mitsushio, M., Higashi, S., & Higo, M. (2003). Analyses of alcohols using a gold-deposited optical-fiber refractive index sensor system. Bunseki Kagaku, 52(6), 433–438. https://doi.org/10.2116/bunsekikagaku.52.433

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