A Highly Sensitive Room Temperature CO2 Gas Sensor Based on SnO2-rGO Hybrid Composite

Lee, Zhi Yan; Hawari, Huzein Fahmi; Witjaksono, Gunawan; Kamarudin, Latifah Munirah

doi:10.3390/ma14030522

Cited by 42 publications

(17 citation statements)

References 48 publications

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“…Table 2 illustrates the performance of many nanomaterials for the detection of CO 2 gas [73][74][75][76]. As shown in this table, the response of the presented sensor is much higher than the values for the sensors previously reported in the literature.…”

Section: Gas-sensing Mechanismmentioning

confidence: 86%

Fabrication of ZnO/CNTs for Application in CO2 Sensor at Room Temperature

et al. 2021

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Thin films of ZnO and ZnO/carbon nanotubes (CNTs) are prepared and used as CO2 gas sensors. The spray pyrolysis method was used to prepare both ZnO and ZnO/CNTs films, with CNTs first prepared using the chemical vapor deposition method (CVD). The chemical structure and optical analyses for all the prepared nanomaterials were performed using X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FTIR), and UV/Vis spectrophotometer devices, respectively. According to the XRD analysis, the crystal sizes of ZnO and ZnO/CNTs were approximately 50.4 and 65.2 nm, respectively. CNTs have average inner and outer diameters of about 3 and 13 nm respectively, according to the transmitted electron microscope (TEM), and a wall thickness of about 5 nm. The detection of CO2 is accomplished by passing varying rates of the gas from 30 to 150 sccm over the prepared thin-film electrodes. At 150 sccm, the sensitivities of ZnO and ZnO/CNTs sensors are 6.8% and 22.4%, respectively. The ZnO/CNTs sensor has a very stable sensitivity to CO2 gas for 21 days. Moreover, this sensor has a high selectivity to CO2 in comparison with other gases, in which the ZnO/CNTs sensor has a higher sensitivity to CO2 compared to H2 and C2H2.

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Section: Gas-sensing Mechanismmentioning

confidence: 86%

Fabrication of ZnO/CNTs for Application in CO2 Sensor at Room Temperature

et al. 2021

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“…In these gas sensors, metal oxide semiconductors, such as zinc oxide (ZnO) [17], nickel oxide (NiO) [18], tin oxide (SnO 2 ) [19,20], titanium dioxide (TiO 2 ) [21], and copper oxide (CuO) [22], have been used as the sensing materials. Among numerous metal oxide semiconductors, CuO has gained more attention due to its low cost, non-toxicity, facile preparation, and high surface reactivity [23,24].…”

Section: Introductionmentioning

confidence: 99%

Copper Oxide/Functionalized Graphene Hybrid Nanostructures for Room Temperature Gas Sensing Applications

et al. 2022

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Oxide semiconductors are conventionally used as sensing materials in gas sensors, however, there are limitations on the detection of gases at room temperature (RT). In this work, a hybrid of copper oxide (CuO) with functionalized graphene (rGO) is proposed to achieve gas sensing at RT. The combination of a high surface area and the presence of many functional groups in the CuO/rGO hybrid material makes it highly sensitive for gas absorption and desorption. To prepare the hybrid material, a copper oxide suspension synthesized using a copper acetate precursor is added to a graphene oxide solution during its reduction using ascorbic acid. Material properties of the CuO/rGO hybrid and its drop-casted thin-films are investigated using Raman, FTIR, SEM, TEM, and four-point probe measurement systems. We found that the hybrid material was enriched with oxygen functional groups (OFGs) and defective sites, along with good electrical conductivity (Sheet resistance~1.5 kΩ/□). The fabricated QCM (quartz crystal microbalance) sensor with a thin layer of the CuO/rGO hybrid demonstrated a high sensing response which was twice the response of the rGO-based sensor for CO2 gas at RT. We believe that the CuO/rGO hybrid is highly suitable for existing and future gas sensors used for domestic and industrial safety.

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“…In these gas sensors, metal oxide semiconductors such as zinc oxide (ZnO) [17], nickel oxide (NiO) [18], Tin oxide (SnO2) [19,20], titanium dioxide (TiO2) [21], and copper oxide (CuO) [22] have been fabricated and used as the sensing materials. Among numerous metal oxide semiconductors, CuO has gained more attention due to its low cost, non-toxicity, facile preparation, and high surface reactivity [23,24].…”

Section: Introductionmentioning

confidence: 99%

Copper Oxide/ Functionalized Graphene Hybrid Nanostructures for Room Temperature Gas Sensing Applications

Gupta¹,

Hawari²,

Kumar³

et al. 2022

Preprint

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Oxide semiconductors are conventionally being used as sensing materials in gas sensors, limiting the detection of gases at room temperature (RT). In this work, a hybrid of copper oxide (CuO) with functionalized graphene (rGO) is proposed to achieve gas sensing at RT. The combination of high surface area and presence of many functional groups in CuO/rGO hybrid material makes it highly sensitive for gas absorption and desorption. To prepare the hybrid material, a copper oxide suspension synthesized using copper acetate precursor is added to the graphene oxide solution during its reduction using ascorbic acid. Material properties of CuO/rGO hybrid and its drop-casted thin films are investigated using Raman, FTIR, SEM, TEM, and four-point probe measurement systems. We find that the hybrid material is enriched with oxygen functional groups (OFGs) and defective sites along with electrical conductivity (~1.5 kΩ/□). The fabricated QCM (quartz crystal microbalance) sensor with a thin layer of CuO/rGO hybrid, demonstrates a high sensing response which is twice the response of the rGO-based sensor for CO2 gas at RT. We believe that the CuO/rGO hybrid can be highly suitable for existing and future gas sensors used for domestic and industrial safety.

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A Highly Sensitive Room Temperature CO2 Gas Sensor Based on SnO2-rGO Hybrid Composite

Cited by 42 publications

References 48 publications

Fabrication of ZnO/CNTs for Application in CO2 Sensor at Room Temperature

Fabrication of ZnO/CNTs for Application in CO2 Sensor at Room Temperature

Copper Oxide/Functionalized Graphene Hybrid Nanostructures for Room Temperature Gas Sensing Applications

Copper Oxide/ Functionalized Graphene Hybrid Nanostructures for Room Temperature Gas Sensing Applications

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