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Table 1 Evaluation of the development of gas sensors based on ZnO/CuO structures

From: Enhanced room temperature gas sensing properties of low temperature solution processed ZnO/CuO heterojunction

Method of synthesis Sensor working temperature (°C) Target gas concentration (ppm) Response Response time (s) Recovery time (s) References
Hydrothermal 220 Ethanol 100 25.5a 6 42 [45]
Hydrothermal 300 Ethanol 100 98.8b 7 9 [46]
Solid state reaction Room temperature Ethanol 150 2.3b 70 88 [41]
Pulsed laser deposition Room temperature Hydrogen sulphide 15 78c 180 15 [47]
Hydrothermal Room temperature Ethanol 5 0.53d 30 63 Present work
50 5.87d 9 420
  1. a \( S = \frac{{V_{g} \left( {5000\,mV - V_{a} } \right)}}{{V_{a} \left( {5000\,mV - V_{g} } \right)}} \)
  2. b \( S = \frac{{R_{a} }}{{R_{g} }} \)
  3. c \( S = \left( {\frac{{I_{g} - I_{a} }}{{I_{a} }}} \right) \times 100 \)
  4. d \( S = \left( {\frac{{I_{g} - I_{a} }}{{I_{a} }}} \right) \)