Figure 1.
(a) Schematic representations of self-powered H2 gas sensor fabrication. First, a 10 nm-thick Pd is thermally evaporated on an indium tin oxide (ITO) surface. The courter surface consists of the polyethylene Terephthalate (PET) and ITO layer. Two contacting surfaces, PET and ITO surfaces, were periodically pressed and released during measurement. Triboelectric output voltages were measured while exposing the devices at different concentrations of H2 gas; (b) transmission electron microscopy (TEM) shows the thickness of evaporated Pd layer, ~10 nm; (c) energy-dispersive X-ray spectroscopy (EDS) of Pd coated ITO electrode. It clearly indicates the contents of Pd deposited on an ITO/PET substrate.