Patent ID: 8323468
Filing Date: 2012-12-04
Classification: G01N

Abstract:
1. An ion concentration measuring device, comprising: a cell into which a measuring solution containing a target substance is introduced; a field effect transistor; an ion selective gold electrode in contact with the measuring solution in the cell, the ion selective electrode being connected to a gate of the field effect transistor by wiring; a reference electrode in contact with the measuring solution in the cell; a power supply that applies a voltage to the reference electrode; a detector that detects an output from the field effect transistor; and a bonded substance composed of a first insulating molecule comprising an alkanethiol and bonded to a crown ether derivative, the bonded substance being immobilized on a surface of the ion selective electrode via a bond between a thiol group of the alkanethiol of the first insulating molecule and gold of the ion selective gold electrode.