Sweat Sensing Using a Photonic Synaptic Transistor Integrated with Electrochemical Gate

Abstract

Electrochemical sensors have been widely used for non-invasive detection of biomarkers in sweat. Recent advancements have led to the development of photoelectrochemical (PEC) sensors, offering high sensitivity and promising performance. By integrating an electrochemical gate structure with a photonic synaptic layer, we have successfully demonstrated a sweat sensor that mimics synaptic function. The interaction between the analyte and the electrochemical gate modulates the photocurrent, enabling concentration sensing. Moreover, the excitatory postsynaptic current peak value (EPSCp), measurable even with brief light irradiation, facilitates faster concentration determination compared to conventional organic electrochemical transistors (OECTs).