Table 1.

Summary of the H₂S gas sensing performances of different gas sensor materials.

Sensor	H2S (ppm)	Temp. (°C)	Response (Ra/Rg)	τres and τrec	References
Zn2SnO4 hollow octahedra	50	260	46	10 and 25 s	Ma et al., 2012
V doped In2O3	50	90	14	15 and 18 s	Liu et al., 2014
Co3O4-SWCNT composites	100	250	51	>100 s	Moon et al., 2016
Al-ZnO thin film	600	200	30	90 and 209 s	Kolhe et al., 2018
CuO-functionalized WO3 nanowires	100	300	79.8	~30 and 20 s	Park et al., 2014
Fe2O3 -NiO nanoplate	200	200	26	11 and 18 s	Sun et al., 2016
TiO2/SiO2 composite aerogel film	50	250	13.5	21 and 600 s	Yang et al., 2018
micro/nanostructured In2O3 porous thin	50	300	30	16 and 30 s	Wang et al., 2016
Gold functionalized MoO3 nano flake	15	400	260	60 and 480 s	Munasinghe Arachchige et al., 2018
ZnO-SnO2 nanofibers	50	250	66.23	18 and 32 s	This work

Temp., the optimal working temperature. τ_res and τ_rec - response time and recovery time.