Highly Sensitive and Selective Sensing of H2S Gas Using Precipitation and Impregnation-Made CuO/SnO2 Thick Films

Table 1 A summary of H₂S response of metal-loaded SnO₂ and CuO/SnO₂ nanomaterials prepared by various methods

Materials	Form	Technical used	Gas conc. (ppm)/Temp (°C)	H₂S Response	Refs
3.0 mol% Ag–SnO₂	Thick film	Spray pyrolysis	450/100	1.38	[10]
0.1 wt% V–SnO₂	Thick film	Flame spray pyrolysis and spin coating	10/350	2.27 × 10³	[11]
0.5 wt% Mo–SnO₂	Thick film	Flame spray pyrolysis and spin coating	10/250	≈105	[12]
Sb–SnO₂ nanoribbons	Thin film	Thermal evaporation	100/150	≈55	[13]
0.64 at% Fe–SnO₂	Thin film	Rheotaxial grown and Thermal oxidation	10/225	14.5	[14]
Cu-doped SnO₂	Thick film	Ultrasonic spray pyrolysis	95.9/100	7.24 × 10³	[15]
2mol% Cu–SnO₂	Thick film	Hydrothermal and drip coating	300/300	40	[16]
Cu–SnO₂ nanowires	Thin film	Thermal evaporation	10/150	5 × 10⁵	[17]
1 at% Cu–SnO₂	Thick film	Electrostatic sprayed	10/100	2.5 × 10³	[18]
SnO_2/CuO islands	Thin film	Sputtering	5/250	128	[19]
CuO-loaded SnO₂	Thick film	Ultrasonic spray pyrolysis	1/300	22.4	[20]
CuO/SnO₂	Thin film	Chemical vapour deposition	10/250	26.3	[21]
3 vol% CuO–SnO₂	Thin film	Pulsed laser deposition	20/140	2.7 × 10⁴	[22]
CuO-loaded SnO₂	Thin film	Electrospinning	10/300	1.98 × 10⁴	[23]
5 mol% CuO/SnO₂	Thin film	Co-dissolution and electrospinning	1/200	≈23	[24]
SnO₂–CuO	Thin film	Sputtering	20/150	8 × 10³	[25]
CuO–SnO₂	Thin film	Pulsed laser deposition	20/100	2.3 × 10³	[26]
CuO–SnO₂ nanowire	Thick film	Thermal evaporation	20/300	809	[27]
CuO–SnO₂	Thick film	Precipitation/Impregnation and drop coating	50/200	6.7	[28]
20 wt% CuO/SnO₂	Thick film	Precipitation/Impregnation and spin coating	10/200 10/150	1.359 × 10⁵ 3.1 × 10⁴	This work