Effects of graphene on the microstructures of SnO2@rGO nanocomposites and their formaldehyde-sensing performance

Rong, Xiaoru; Chen, Deliang; Qu, Geping; Li, Tao; Zhang, Rui; Sun, Jing

doi:10.1016/j.snb.2018.04.176

Cited by 83 publications

(57 citation statements)

References 74 publications

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“…Two weak peaks, referred to as second-order D and G (2D and 2G) bands, were also observed overlapping between 2700 and 2900 cm −1 . In this case, the material has a multilayer structure, which further reinstates that the facile chemical routes successfully synthesize high-density rGO [ 25 , 43 ]. The 2D and 2G peaks will appear regardless of defects in the material.…”

Section: Resultsmentioning

confidence: 74%

“…After the addition of SnO 2 to rGO, the intensity ratio of the D band and G band is 1.006, higher than the 0.993 from rGO. The improved intensity ratio implies that the synergistic effect of the SnO 2 -rGO hybridization creates more disorder in terms of vacancies and grain boundaries and decreases the size of the sp 2 carbon domain [ 25 , 27 , 44 ]. GO can be efficiently reduced to a higher degree with tin salt rather than ascorbic acid.…”

Section: Resultsmentioning

confidence: 99%

“…Synergistic hybridization of rGO with metal oxide particles has been an effective way to greatly improve gas detection because it combines both materials’ traits and enhances gas sensing capabilities toward various gases. Many composite modifications have been made, such as the formation of SnO 2 /rGO [ 22 , 23 , 24 , 25 , 26 , 27 ], zinc oxide/reduced graphene oxide (ZnO/rGO) [ 28 ], cobalt oxide/reduced graphene oxide (Co 3 O 4 /rGO) [ 29 ] and tin-titanium dioxide/reduced graphene oxide/carbon nanotube (Sn–TiO 2 /rGO/CNT) [ 30 ]. These composites exhibit good gas detection, including enhanced sensitivity at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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A tin oxide (SnO2) and reduced graphene oxide (rGO) hybrid composite gas sensor for high-performance carbon dioxide (CO2) gas detection at room temperature was studied. Since it can be used independently from a heater, it emerges as a promising candidate for reducing the complexity of device circuitry, packaging size, and fabrication cost; furthermore, it favors integration into portable devices with a low energy density battery. In this study, SnO2-rGO was prepared via an in-situ chemical reduction route. Dedicated material characterization techniques including field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray (EDX) spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) were conducted. The gas sensor based on the synthesized hybrid composite was successfully tested over a wide range of carbon dioxide concentrations where it exhibited excellent response magnitudes, good linearity, and low detection limit. The synergistic effect can explain the obtained hybrid gas sensor’s prominent sensing properties between SnO2 and rGO that provide excellent charge transport capability and an abundance of sensing sites.

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Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…Currently, the most extensively approved mechanism of In 2 O 3 (the typical n‐type semiconductor) is the surface depletion layer theory . Generally, the reaction of absorbed oxygen and the target gas on the surface affects the thickness of depletion layer, which leading to the change of resistance . As illustrated in Figure , the oxygen molecules in air will absorb on the surface of the sensor based on In 2 O 3 and trapped electrons from the conduction band of In 2 O 3 to generate the chemisorbed oxygen species O I (O 2− (ads) ) and O II (O − (ads) , and O 2 − (ads) ) when the sensor is exposed to fresh air, which could lead to the increase of the thickness of depletion layer and the resistance.…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of In₂O₃ nanoparticles with high response to formaldehyde at low temperature

Wang

Zhang

et al. 2019

Int J Applied Ceramic Tech

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In 2 O 3 nanoparticles with uniform particle size (10-25 nm) were obtained using the facile precipitation strategy at room temperature with following calcined treatment.The gas-sensing performance of In 2 O 3 nanoparticles with different calcined temperatures was investigated. The results demonstrated that the In 2 O 3 nanoparticles calcined at 500°C exhibited highest sensing response (R a /R g = 68.1) to 10 ppm HCHO at 100°C with good selectivity, stability, reproducibility, and ultra-low limit of detection (1 ppm). The results of XPS, UV, and other characterizations indicated that In 2 O 3 -500 possessed the most absorbed oxygen species, the highest carrier mobility, and lowest band gap energies. Our work offers new insights into the development of sensing materials to the detection of volatile organic compounds (VOCs). K E Y W O R D Scalcined temperature, gas sensing, HCHO, In 2 O 3

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“…Especially, nose and throat cancer are more easily caused than what is expected [3,4]. In order to detect HCHO effectively, various techniques and metal oxide semiconductors (MOSs) based gas sensors have recently developed, including SnO 2 [5][6][7], Co 3 O 4 -ZnO core-shell NFs [8], ultrathin In 2 O 3 nanosheets [9], reduced graphene oxide (rGO)/TiO 2 [10] and Cr-doped WO 3 nanosheets [11]. Due to their stable sensitivity and low-cost production, metal oxide semiconductors are widely studied.…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

2019

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In this work, we reported a formaldehyde (HCHO) gas sensor with highly sensitive and selective gas-sensing performance at low operating temperature based on graphene oxide (GO)@SnO 2 nanofiber/nanosheets (NF/NSs) nanocomposites. Hierarchical SnO 2 NF/NSs coated with GO nanosheets showed enhanced sensing performance for HCHO gas, especially at low operating temperature. A series of characterization methods, including X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) were used to characterize their microstructures, morphologies, compositions, surface areas and so on. The sensing performance of GO@SnO 2 NF/NSs nanocomposites was optimized by adjusting the loading amount of GO ranging from 0.25% to 1.25%. The results showed the optimum loading amount of 1% GO in GO@SnO 2 NF/NSs nanocomposites not only exhibited the highest sensitivity value (R a /R g = 280 to 100 ppm HCHO gas) but also lowered the optimum operation temperature from 120 • C to 60 • C. The response value was about 4.5 times higher than that of pure hierarchical SnO 2 NF/NSs (R a /R g = 64 to 100 ppm). GO@SnO 2 NF/NSs nanocomposites showed lower detection limit down to 0.25 ppm HCHO and excellent selectivity against interfering gases (ethanol (C 2 H 5 OH), acetone (CH 3 COCH 3 ), methanol (CH 3 OH), ammonia (NH 3 ), methylbenzene (C 7 H 8 ), benzene (C 6 H 6 ) and water (H 2 O)). The enhanced sensing performance for HCHO was mainly ascribed to the high specific surface area, suitable electron transfer channels and the synergistic effect of the SnO 2 NF/NSs and GO nanosheets network.Molecules 2020, 25, 35 2 of 15 sensitivity, poor selectivity and/or relatively high optimum operation temperature. Hence, designing and developing gas sensors with high sensibility, excellent selectivity and lower optimum operation temperature is urgent and important.Graphene is a typical two-dimensional (2D) sheet of sp 2 bonded carbon with excellent electronic applications. Due to its unique physical and chemical properties, many efforts have been carried out on the application of graphene as sensing elements [12]. These advantages, including its high conductivity, large surface area and low electrical noise, make it a promising platform for preparing new sensors [13][14][15]. In order to prepare a new gas sensor with high sensing performance, low operation temperature and excellent selectivity, the combination of graphene and metal oxide semiconductors is a new strategy to enhance sensing performance compared to pure sensing materials [16]. Gaikwad et al. have reported a NH 3 gas sensor based on Polyaniline/Graphene Oxide (PANI/GO) by nanoemulsion method [17]. Sun et al. have synthesized rGO/ZnSnO 3 composites as a sensing material for detecting HCHO gas by a facile solution-based self-assembly synthesis method [18]. Rong et al. have prepared microstructures of SnO 2 @rGO nanocomposites for HCHO detection by facile thermal treatment ...

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Effects of graphene on the microstructures of SnO2@rGO nanocomposites and their formaldehyde-sensing performance

Cited by 83 publications

References 74 publications

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

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

Facile synthesis of In₂O₃ nanoparticles with high response to formaldehyde at low temperature

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

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Effects of graphene on the microstructures of SnO2@rGO nanocomposites and their formaldehyde-sensing performance

Cited by 83 publications

References 74 publications

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

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

Facile synthesis of In2O3 nanoparticles with high response to formaldehyde at low temperature

Graphene Oxide@3D Hierarchical SnO2 Nanofiber/Nanosheets Nanocomposites for Highly Sensitive and Low-Temperature Formaldehyde Detection

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Facile synthesis of In₂O₃ nanoparticles with high response to formaldehyde at low temperature