Table 1.

Summary of the gas sensing properties of ZnO, shown in Figure 6. The equation column shows the best-fit lines for the sensitivity of the thin film (solid lines in Figure 6).

Reacting gas	Temperature	Equation	Concentration
Hydrogen (H2) [28]	350 °C	4.43 · e0.0088·Cppm	50 ppm–400 ppm
Liquid petroleum gas (LPG) [29]	300 °C	43.1 · e0.0063·Cppm	20 ppm–100 ppm
Acetone ((CH3)2CO) [30]	275 °C	382 · ln(Cppm + 1686) – 2737	400 ppm–4000 ppm
	300 °C	710 · ln(Cppm + 2705) – 5561
Ethanol (C2H5OH) [30]	275 °C	157 · ln(Cppm + 385) – 850
	300 °C	290 · ln(Cppm + 2330) – 2100