A Highly Transparent Chip for Sensing Hydrogen Peroxide

Developing a fully transparent sensor for the detection of the target analyte is of great importance for environmental and defense monitoring. Indium tin oxide (ITO), as a highly transparent conductive electronic material, is widely used in research and industrial applications. We show here, for the first time, the development of a fully transparent amperometric biosensor for detecting hydrogen peroxide (H
₂
O
₂
) by using ITO electrodes as the working electrode and the reference/counter electrode. The sensor shows a highly sensitive and rapid detection of H
₂
O
₂
and, in the meantime, maintains high transparency. We expect that these results could open exciting opportunities for fundamental studies of transparent electronic devices and advance related applications in environmental monitoring and defense.