Silver-ion redox sensing based on colloid formation by gallate ester derivatives |
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Authors: | Yajima Setsuko Iwane Yoshie Nomura Eisaku Taniguchi Hisaji Kimura Keiichi |
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Affiliation: | a Faculty of Systems Engineering, Wakayama University, Sakae-dani 930, Wakayama 640-8510, Japan b Industrial Technology Center of Wakayama Prefecture, 60 Ogura, Wakayama 649-6261, Japan |
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Abstract: | Plasmon absorption of silver colloid, which was formed by reduction of silver ion with compounds bearing gallate ester groups in ethanol, was observed by absorption spectroscopy. The time-dependent absorption of silver colloid was found, which shows that the silver colloid is unstable and easy to aggregate. It seemed that a calixarene derivative bearing two gallate ester groups was the most suitable for determining silver ion. In order to prevent the silver colloid aggregation, poly(N-vinylpyrrolidone) (PVP) was added into the solution at a constant time after the preparation of sample solutions. In the calibration graph, the absorbance increased with increasing silver ion concentration, especially in the concentration range of 2.00 × 10−6 to 1.00 × 10−5 M. It is possible to determine silver ion concentrations using this method. |
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Keywords: | Silver nanoparticle Gallate ester group Silver ion reduction Plasmon absorption Quantitative determination |
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