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Chemosensors 2014, 2(3), 207-218;

Photonic Crystal-Based Sensing and Imaging of Potassium Ions

Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93040 Regensburg, Germany
Author to whom correspondence should be addressed.
Received: 28 April 2014 / Revised: 4 August 2014 / Accepted: 9 September 2014 / Published: 18 September 2014
(This article belongs to the Special Issue Photonic Sensors for Biological and Chemical Measurements)
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We report on a method for selective optical sensing and imaging of potassium ions using a sandwich assembly composed of layers of photonic crystals and an ion-selective membrane. This represents a new scheme for sensing ions in that an ionic strength-sensitive photonic crystal hydrogel layer is combined with a K+-selective membrane. The latter consists of plasticized poly(vinyl chloride) doped with the K+-selective ion carrier, valinomycin. The film has a red color if immersed into plain water, but is green in 5 mM KCl and purple at KCl concentrations of 100 mM or higher. This 3D photonic crystal sensor responds to K+ ions in the 1 to 50 mM concentration range (which includes the K+ concentration range encountered in blood) and shows high selectivity over ammonium and sodium ions. Sensor films were also imaged with a digital camera by exploiting the RGB technique. View Full-Text
Keywords: photonic crystal; chemical sensor; hydrogel; RGB readout; potassium sensing; imaging photonic crystal; chemical sensor; hydrogel; RGB readout; potassium sensing; imaging

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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Fenzl, C.; Kirchinger, M.; Hirsch, T.; Wolfbeis, O.S. Photonic Crystal-Based Sensing and Imaging of Potassium Ions. Chemosensors 2014, 2, 207-218.

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