Design for testing SU-8 and PDMS based hybrid glucose sensor

Abstract

In this paper, a test method for testing SU-8 and PDMS based hybrid glucose sensor with gold electrodes sandwiched between the two SU-8 layers is presented. Poly dimethylesiloxane (PDMS) and SU-8 is used as a flexible and bio-compatible sensor substrate material. Furthermore, SU-8 and PDMS is optically transparent and haemocompatible which is very important for implantable sensors. Different methods for testing glucose sensors are mentioned in a separate section. These test methods are categorized in different sections namely, material related tests, fabrication related tests, electrochemical related test and glucose response tests. And each test section is sub-categorized in appropriate sub-sections. The bottom PDMS layer of the sensor is ~500 mum thick and both SU-8 layers are ~100 mum. Each sensor chip is 5.5 mm X 10.5 mm in size with 2 mm X 3 mm for the actual sensor area. Resistance of the successfully fabricated gold electrodes is measured between 1 to 5 mOmega. The drift of the sensors are measured using phosphate buffer followed by the linearity test using the glucose solution.