Extended Data Fig. 4: Characterisation of the hydrogen sensor.
From: A robust organic hydrogen sensor for distributed monitoring applications
Hydrogen sensing experiments using interdigitated electrodes coated with DPP-DTT as the sensing material tested at various H2 concentrations from 0 to 1000 ppm. a, I-V curves. b, H2 concentration-dependent responsivity variation was measured at a constant applied bias of 1.0 V. The error bars indicate uncertainties in the device responsivity mainly stemming from uncertainties in the thickness of the DPP-DTT thin films and represent standard deviation among four individual devices prepared from different batch. c, H2 concentration-dependent response variation for a constant applied bias of 0.5 V. The fluctuations after 200 seconds may be due to noise originating from the measurement cables and instruments. d, Real-time current evolution upon temporal exposure to H2 at different concentrations measured at a constant bias of 0.5 V. e, Device current variation for H2 concentration changes in pulsing conditions from 0 ppm to 1000 ppm at an applied bias of 0.5 V for 1000 cycles. Inset shows a zoomed portion indicating clear hydrogen response. f, Rise and fall time calculated from the fast hydrogen response for the 1000 ppm H2 concentration condition. The error bars denote the standard deviation of the mean by averaging over 33 different sensing cycles from a single device.
