Table 1 CuO-decorated ZnO heterojunction sensors reported to detect H2S gas molecules.

From: CuO-Decorated ZnO Hierarchical Nanostructures as Efficient and Established Sensing Materials for H2S Gas Sensors

Year

Morphology

Concentration (ppm)

S (Ra/Rg)

Temperature (°C)

S (%)/1 ppm

τRes/τRec (s)

Ref.

2003

Powder

50

20

108

40

13/5

16

2012

Hollow sphere

5

32.5

336

650

47/– (a)

11

2012

Nanowire

5

28

200

560

360/1800 (a)

17

2012

Nanorod

100

39

100

39

120/>120 (a)

14

2012

Nanorod

50

~889

500

1778

950/50 (a)

15

2013

Flower

100

25

220

25

–/–

12

2015

Hierarchical

5

83.5

200

1670

572/65

[this study]

  1. (a)The response time is defined as the time required for reaching 90% of the full response change of the sensor after the testing gas enters and the recovery time is defined as the time taken to fall to 10% of its maximum response after the testing gas exits.
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