Fig. 2: Experimental and theoretical analysis of Pd based H2 sensor performance degradation.
From: Long-term reliable wireless H2 gas sensor via repeatable thermal refreshing of palladium nanowire
a chemo-electrical response immediately as-fabricated (left) and after 7 days (right). b Quantitative comparison of response time (\({\tau }_{{res}}\)) and gas response (\({R/R}_{0}\)) between initial and contaminated states. (Initial state: R2 = 0.94 (\(y=-4x+26\)), 0.71 (\(y=-20x+117\)) for \({\tau }_{{res}}\) and \({R/R}_{0}\), respectively. Contaminated state: R2 = 0.94 (\(y=2x+6\)), 0.92 (\(y=2x+10\)) for \({\tau }_{{res}}\) and \({R/R}_{0}\), respectively). c XPS analysis about palladium (Pd) and carbon (C) at the initial state. d XPS analysis of Pd and C at contaminated state. e Schematic illustration of density functional theory (DFT) for Pd with H2, H2O, CO, and CO2 molecules. f Quantitative analysis of adsorption energy. The error bars in (b) represent the standard deviations from three individual devices.
