Evaluation of Metal Oxide Thin-Film Electrolyte-Gated Field Effect Transistors for Glucose Monitoring in Small Volume of Body Analytes

Monitoringof chronic diseases such as diabetes without painful detection from blood enables people to improve their quality of life. Although various nanomaterials have remarkable characteristics that allow them to be used, the complexity of reliable fabrication is still challenging for their real applications. By using InGaZnO, simply deposited as thin-film structure, combined with electrolyte-gated field-effect transistors, highly sensitive sensing performance was demonstrated. The sensor characteristics were evaluated on the device level in various concentration of pH and glucose. It also exhibited good sensing capability in a high ionic solution over the screening effect with low interference among potential impediments for glucose. The sensing range and detection limit of device represent that sensing glucose in tear level could be practicable.