. 2015 Mar 25;15(4):7206–7227. doi: 10.3390/s150407206

Table 4.

Summary of the gas sensing properties of SnO₂, shown in Figure 9. The equation column shows the best-fit lines for the sensitivity of the thin film (solid lines in Figure 9).

Reacting gas	Temperature	Equation	Concentration
Carbon monoxide (CO)	287 °C [38]	e^{0.00276·C_ppm}	< 150 ppm
	287 °C [38]	0.37 · ln(c_ppm) – 0.35	150 ppm–500 ppm

	400 °C [39]	9.9 · ln (C_ppm + 79) – 42.2	< 500 ppm

Hydrogen (H₂) [16]	350 °C	2.58 · ln(C_ppm + 44) – 8.74	< 100 ppm