Exploitation of a pH-sensitive hydrogel disk for CO2 detection

[摘要] In this paper is described how hydrogel is exploited as sensor material for the detection of carbon dioxide (CO2). A pH-sensitive hydrogel disk, which swells and deswells in response to pH changes, was clamped between a pressure sensor membrane and a porous metal screen together with a bicarbonate solution. CO2 reacts with the bicarbonate solution resulting in a pH change, which is converted into a pressure by the enclosed hydrogel. This pressure is a measure for the partial pressure of CO2. The main advantage of this sensor principle is the fact that a reference electrode as required for potentiometric sensors is no longer needed. (C) 2004 Elsevier B.V. All rights reserved.

[发布日期] 2004-09-29

[效力级别]  Proceedings Paper

[关键词] hydrogel;pH-sensitive;stimulus-sensitive;P-CO2 sensor;Severinghaus