Fig. 2: H2S sensing properties of Zn/Ag/DNO.
a Schematic diagram illustrating the device structure and H2S-sensing mechanism of Zn/Ag/DNO gas sensor. b Dynamic responses of Zn/Fe/DNH, Zn/Ag/DNH, and Fe/Ag/DNH to H2S gas with reduced concentration from 4 to 0.8 ppm. c Dynamic responses of Zn/Ag/DNH and Zn/Ag/DNOs to H2S gas with reduced concentration from 4 to 0.8 ppm after baseline corrections. d Average response (dots) of three Zn/Ag/Gly1h-DNO samples versus H2S concentration and corresponding linear fitting line that revealed the sensitivity. The error bars denote standard deviations of the mean. e Dynamic OCV and f response histogram of Zn/Ag/DNO sensor to 0.8 ppm H2S cycling for the first time and after 20 days of placement. g Comparison of Zn/Ag/DNH and Zn/Ag/DNO sensors’ responses to 0.8 ppm H2S from the first test and the test after 20 days of placement. n = 5 for each group. The error bars denote the standard deviations (σ) of the mean. h Experimental detection limit of Zn/Ag/DNO sensor to H2S. 20 ppb is the minimum concentration that can be achieved under current experimental conditions. i Comparison in the responses of the Zn/Ag/DNO sensors to various gaseous chemicals. n = 3 for the H2S group and n = 5 for the other groups. The error bars denote standard deviations of the mean. The precise mean responses are −86.56, −12.47, −0.13, and −10.69 mV for H2S, O2, NO, and dimethyl sulfide, respectively. Responses to the other interfering chemicals are imperceptible. j Capability radar comparing the performance of the state-of-the-art H2S sensors.
