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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 \( S = \left( {\frac{{I_{g} - I_{a} }}{{I_{a} }}} \right) \)