Journal of Nanotechnology / 2022 / Article / Tab 10 / Review Article
Graphene and g-C3 N4 -Based Gas Sensors Table 10 The performances of nanocomposites based on g-CN for gas sensor applications.
Material Method Response/Gas Response/recovery time (s) ppm level Operation T (°C) Detection limit Comment Ref. TiO2 Spray pyrolysis technique Ra/Rg = 25%/H2 S ∼52/60 1500 450 U The improvement in the detection performance of the sensor is due to the introduction of 10% of the g-CN nanosheets [103 ] Ra/Rg = 22%/CO2 45/55 g-CN (10 wt%)/TiO2 Ra/Rg = 67%/H2 S ∼30/52 Ra/Rg = 88%/CO2 35/27 SnO2 Hydrothermal method Ra/Rg = 13.4%/acetic acid 94/160 1000 230°C U Improvement of the operating temperature and the sensitivity by introduction of 10 wt% of g-CN in SnO2 [58 ] 10 wt% of g-CN-SnO2 Ra/Rg = 87.7%/CH3 COOH U 185°C 0.1 ppm g-CN-SnO2 One-step calcination method Vg/Va = 83%/acetone 7/8 500 380°C 67 ppb A significant improvement in sensor performance by calcining melamine/SnO2 powder for 3 hours [14 ] 5%Pd/SnO2 /5%g-CN Hydrothermal method (Rg-Ra)/Ra = 90.5%/CO 10/13 1000 125°C 75 ppm g-CN-5% nanosheets with SnO2 nanoparticles effectively improved the response of the gas sensors towards CO [25 ] 2 wt% g-CN-WO3 Hydrothermal method Ra/Rg = 58.2%/acetone 53/29 1000 310°C 0.5 ppm A gas sensor based on 2% g-CN composite shows a higher response to acetone than pure WO3 [125 ] 10 wt% g-CN/MgFe2 O4 One-step solvothermal method Ra/Rg = 275/acetone 49/29 500 320°C 30 ppb The introduction of 10% of g-CN nanosheets in MgFe2 O4 improves their detection performance [126 ] Gr/g-CN Drop coating method (Rg-Ra)/Ra = 42%/NO2 U 5 100°C 600 ppb Graphitic carbon nitride nanosheets with 15% of g-CN exhibit high detection performance compared to bulk g-CN and pure graphene [127 ] 10 wt% g-CN/ZnO Synthesized via ultrasonic mixing and subsequent calcination process Rg/Ra = 44.8%/NO2 142/190 7 U 38 ppm Detection performance is activated by LED light sources. 460 nm LED (12.7 W/m2 ) [128 ]
“U”: unavailable citation: it is not cited in the study. Vg/Va: electric voltages in the target gases and atmospheric air, respectively. Ra/Rg: electric resistances in the atmospheric air and target gases, respectively.
