A biological and chemical sensor with a rapid response in a micro level test is required for health and environmental monitoring. Our approach to develop a high performance sensor is to sense chemical substances with a porous monolith type ion exchanger having 3D acceptors. This porous ion exchanger has an open-cellular structure with 5∼50μm diameter pore. The concentration of amino acids in the solution can be detected by measuring impedance of the monolith. We have succeeded in sensing amino acids with a concentration as low as 5×10-7 mol. The porous ion exchanger has a potential of a high performance device for biological sensing.
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