A SELF-CONTAINED GLUCOSE SENSOR CHIP WITH ARRAYED CAPILLARIES

A circular arrayed sensor which integrates a number of linear capillar ies and enzyme immobilized platinum electrodes on a silicon wafer has been developed. This sensor device has no need of other electrical or mechanical devices, because the sample solution is introduced by capil lary action. The sensor was fabricated using silicon semiconductor tec hnology, allowing mass production of a miniature sensor. Each linear u nit is a self-contained device. Glucose solution is drawn into a capil lary by surface tension, reacts with immobilized glucose oxidase and p roduces hydrogen peroxide (H2O2). The electrochemical signal due to th e oxidation of H2O2 is measured using a sputtered platinum electrode. This sensor device is capable of measuring glucose concentration rangi ng from 10 to 200 mM.