Fe2O3-loaded NiO nanosheets for fast response/recovery and high response gas sensor

Tan, Wenhu; Tan, Jianfeng; Fan, Lvrong; Yu, Zetai; Qian, Jing; Huang, Xintang

doi:10.1016/j.snb.2017.09.187

Cited by 78 publications

(31 citation statements)

References 67 publications

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“…For 2D-in-3D hierarchical architectures, the metal oxide may grow in the desired structure spontaneously [33][34][35][36][37] or structure-directing agents such as cetyltrimethylammoniumbromide [38][39][40][41], glycerol [39,42], hexamethylenetetramine [23,[43][44][45], polyvinylpyrrolidone [2,40,46,47], urea [25,40,48,49], sodiumdodecylsulfate [50][51][52] or polyethyleneglycol [52][53][54][55] can be added. Also, seed layers may be employed to initiate growth [23,24,43,44,56] and occasionally microwave-assisted procedures are used [57,58]. After the 2D-in-3D architecture is obtained, annealing at 250-500°C may be required for decomposition of organic residues, dehydroxylation or crystallization.…”

Section: Synthesis Of 2d Nanoflakesmentioning

confidence: 99%

2D metal oxide nanoflakes for sensing applications: Review and perspective

Dral

Elshof

2018

Sensors and Actuators B: Chemical

121

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In this review the state of the art and future prospects of 2-dimensional (2D) metal oxide nanoflakes used as active sensing elements for the detection of solutes, gases and radiation are discussed. 2D material geometries are particularly interesting for sensing applications because they provide large specific surface areas and are suitable for crystal facet engineering. In addition, unique material properties of atomically thin nanosheets due to quantum size effects provide engineering possibilities beyond the realm of their bulk counterparts. A variety of possibilities in materials, synthesis routes, (hierarchical) sensor architectures and application areas is sketched. The discussion is focused on high-performing sensors and innovative concepts. The scope is limited to nanoflakes with a thickness of up to 50 nm. Special attention is given to sensing based on material properties that are unique to atomically thin nanosheets.

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Section: Synthesis Of 2d Nanoflakesmentioning

confidence: 99%

2D metal oxide nanoflakes for sensing applications: Review and perspective

Dral

Elshof

2018

Sensors and Actuators B: Chemical

121

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“…Several approaches have been used to improve the sensitivity and selectivity of single metal oxide-based ethanol sensor. These include addition of noble metals (Chen et al, 2019;Liu et al, 2019b;ul Haq et al, 2019) doping of metal oxide catalyst (Park et al, 2015;NaderiNasrabadi et al, 2016;Lupan et al, 2017;Tan et al, 2018), developing composite metal oxides consisting of binary or ternary phase metal oxide systems (Li et al, 2019;Wang et al, 2019) and development of nanostructures with different morphologies (Drobek et al, 2016;Wang et al, 2018;Yang et al, 2018). Among the approaches used, tailoring of composite metal oxides with different morphologies presents a good potential for tuning the sensitivity and selectivity during gas sensing.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Selective Ethanol Sensor Based on ZnO Nanorod on SnO2 Thin Film Fabricated by Spray Pyrolysis

et al. 2019

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This work reports the fabrication of mixed structure of ZnO nanorod on SnO 2 thin film via spray pyrolysis followed by thermal annealing and their gas sensing properties. ZnO/SnO 2 nanostructures are successfully prepared on a gold interdigitated alumina substrate by spraying varying mixed precursor concentrations of zinc acetate and tin (IV) chloride pentahydrate solutions in ethanol and thermal annealing. The morphology of the nanostructures is controlled by tailoring the Zn:Sn ratio in the precursor solution mixture. Unique ZnO crystals and ZnO nanorods are observed under a field emission scanning electron microscopy (FESEM) when the Zn/Sn ratio in the precursor solution is in between 13:7 and 17:3 after thermal annealing. The fabricated nanostructures are tested for ethanol, methane and hydrogen in air ambient for various gas concentrations ranging from 25 to 400 ppm and the effect of fabrication conditions on the sensitivity and selectivity are studied. Among the nanostructure sensors studied, the film fabricated with molar ratio of Zn/Sn =3:1 shows better sensitivity and selectivity to ethanol due to high sensing surface area of the nanorod. The response to 25 ppm ethanol is found to be as high as 50 at an operating temperature of 400 • C.

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“…Thus, it is necessary to quickly detect low concentrations of methanol gas at lower operating temperatures. However, previous research on methanol gas sensors [3, 4] have not been satisfactory because of the high detection limit (> 50 ppm) and high operating temperature (> 275 °C). In addition, few studies reported on the humidity stability issue of gas sensors.…”

Section: Introductionmentioning

confidence: 99%

High Methanol Gas-Sensing Performance of Sm2O3/ZnO/SmFeO3 Microspheres Synthesized Via a Hydrothermal Method

Chen

et al. 2019

Nanoscale Res Lett

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In this work, we synthesized Sm 2 O 3 /ZnO/SmFeO 3 microspheres by a hydrothermal method combined with microwave assistance to serve as a methanol gas sensor. We investigated the effect on the microstructure at different hydrothermal times (12 h, 18 h, 24 h, and 30 h), and the BET and XPS results revealed that the specific surface area and adsorbed oxygen species were consistent with a microstructure that significantly influences the sensing performance. The gas properties of the Sm 2 O 3 -doped ZnO/SmFeO 3 microspheres were also investigated. With a hydrothermal time of 24 h, the gas sensor exhibited excellent sensing performance for methanol gas. For 5 ppm of methanol gas at 195 °C, the response reached 119.8 with excellent repeatability and long-term stability in a 30-day test in a relatively high humidity atmosphere (55–75% RH). Even at 1 ppm of methanol gas, the response was also higher than 20. Thus, the Sm 2 O 3 -doped ZnO/SmFeO 3 microspheres can be considered as prospective materials for methanol gas sensors.

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Fe2O3-loaded NiO nanosheets for fast response/recovery and high response gas sensor

Cited by 78 publications

References 67 publications

2D metal oxide nanoflakes for sensing applications: Review and perspective

2D metal oxide nanoflakes for sensing applications: Review and perspective

Highly Sensitive and Selective Ethanol Sensor Based on ZnO Nanorod on SnO2 Thin Film Fabricated by Spray Pyrolysis

High Methanol Gas-Sensing Performance of Sm2O3/ZnO/SmFeO3 Microspheres Synthesized Via a Hydrothermal Method

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