Layer-by-layer nanocomposites consisting of Co3O4 and reduced graphene (rGO) nanosheets for high selectivity ethanol gas sensors

Tian, Menghan; Miao, Jiayu; Cheng, Pengfei; Mu, Hongchen; Tu, Jinchun; Sun, Jianbo

doi:10.1016/j.apsusc.2019.02.148

Cited by 52 publications

(17 citation statements)

References 43 publications

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“…The rapid response/ recovery performance can be partly attributed to the novel hierarchical nanostructure construction, which provides beneficial porous/channel structure and more active sites accelerating chemical absorption and stripping of the gas. [44,46] Again, the ratio of chemical components can effectively improve the absorption/desorption rate of acetone molecules, which may be the major factor to shorten the recovery time of the device. [47,48] For an excellent gas sensor, in addition, the longterm stability and selectivity are also considered as important evaluation indexes.…”

Section: Resultsmentioning

confidence: 99%

Construction of Hierarchical α‐Fe₂O₃/SnO₂ Nanoball Arrays with Superior Acetone Sensing Performance

Wang

Han

et al. 2020

Adv Materials Inter

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commercial applications both in military and civilian fields. [2-5] From the aspect of safety and environmental quality, gas sensors are becoming more and more important in our daily life, because they can instantly monitor the potential risk of explosive/toxic gas emission or leakage. [6] Acetone, for example, a kind of volatile organic compound (VOCs) with special aroma and colorless transparent nature, which is extensively utilized in micro/ nanoelectronics field, lithography, coatings, leather, pesticides, explosive plastic, rubber, paint, etc. [7-10] Specifically, acetone is also a flammable, explosive, and toxic organic liquid with an ignition point of 465 °C, and the most easily ignitable concentration is 4.5%. [11] Moreover, acetone vapor and air can easily form one explosive mixture with the explosive limit of ≈2.6-12.8%, and the concentration of the maximum explosive pressure is 6.3%. Therefore, once the acetone leakage occurs, it is easy to trigger public safety accident. [12,13] In recent years, MOSs such as SnO 2 , Fe 2 O 3 , ZnO, WO 3 , In 2 O 3 and their hybrids/composites based electronics such as sensors and detectors have allured intensive desire due to the wide application on detecting irritative, malodorous, explosive, and toxic VOC gases. [4,14-19] Unfortunately, gas sensors based on MOSs are still bearing some urgent problems to overcome such as slow response, a narrow detection limit, inferior selectivity, and short-term cycling stability, especially in high humidity conditions. [20,21] Very recently, many strategies have been proposed to relieve the above shortcomings via various intrigues such as rare metal decoration, doping modification technology, heterojunction, microwave-assist, etc. [22-27] Accordingly, some convincible progress and results have been achieved or are pushing forward. In 2019, Lu's group reported that the Au-doped and Au-loaded mesoporous In 2 O 3 exhibited superior acetone sensing performance. It was demonstrated that the sensing performance can be manipulated by different doping or loading methods of Au; Thereafter, the SnO 2 ultrathin films functionalized by single atom Pt could greatly enhance the trietylamine gas sensing performance; [25,28] Then, Chen and his co-workers reported that the p(NiO)/n(ZnO) heterojunction networks could increase the gas sensor response by more than four times, meanwhile, the lower detection limit was achieved. On the other hand, the p-n nanoheterojunction networks displayed a strong and selective response toward acetone and ethanol under Gas sensors based on SnO 2 , Fe 2 O 3 , and their nanocomposites are promising candidates for sensing of acetone, ethanol, hydrogen, NO 2 , ozone, and formaldehyde. In this work, a rational hydrothermal route is designed to prepare α-Fe 2 O 3 /SnO 2 porous sphere arrays assembled with hierarchical nanostructure (denoted as α-Fe 2 O 3 (x%)/SnO 2). The results demonstrate that the α-Fe 2 O 3 (4%)/SnO 2 based sensor exhibits excellent sensing performance, the short response/recovery time of 3 and 4 s, re...

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Section: Resultsmentioning

confidence: 99%

Construction of Hierarchical α‐Fe₂O₃/SnO₂ Nanoball Arrays with Superior Acetone Sensing Performance

Wang

Han

et al. 2020

Adv Materials Inter

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“…Notably, the 5%RGO–WO 3 ⋅0.33H 2 O showed superior isopropanol-selective sensing performances, with an almost two-fold higher response with respect to the bare compound ( Figure 7 i). Furthermore, Tian et al [ 88 ] prepared a layer-by-layer nanocomposite consisting of Co 3 O 4 and reduced graphene (RGO) nanosheets by a simple hydrothermal process followed by an annealing step (see scheme in Figure 7 j), which was very promising for the selective detection of ethanol molecules (at 200 °C, see Figure 7 l). The effective synthesis accomplishment was confirmed by TEM images which show wrinkle-like RGO underneath mesoporous cobalt oxide nanosheets (see Figure 7 k).…”

Section: Reduced Graphene Oxide-based Chemoresistorsmentioning

confidence: 99%

“…( m ) Comparison of pure Co 3 O 4 and GCO 15% responses to various gases. Reproduced with permission from [ 88 ]. Elsevier, 2019.…”

Section: Figures Scheme and Tablesmentioning

confidence: 99%

Breakthroughs in the Design of Novel Carbon-Based Metal Oxides Nanocomposites for VOCs Gas Sensing

Pargoletti

Cappelletti

2020

Nanomaterials

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Nowadays, the detection of volatile organic compounds (VOCs) at trace levels (down to ppb) is feasible by exploiting ultra-sensitive and highly selective chemoresistors, especially in the field of medical diagnosis. By coupling metal oxide semiconductors (MOS e.g., SnO2, ZnO, WO3, CuO, TiO2 and Fe2O3) with innovative carbon-based materials (graphene, graphene oxide, reduced graphene oxide, single-wall and multi-wall carbon nanotubes), outstanding performances in terms of sensitivity, selectivity, limits of detection, response and recovery times towards specific gaseous targets (such as ethanol, acetone, formaldehyde and aromatic compounds) can be easily achieved. Notably, carbonaceous species, highly interconnected to MOS nanoparticles, enhance the sensor responses by (i) increasing the surface area and the pore content, (ii) favoring the electron migration, the transfer efficiency (spillover effect) and gas diffusion rate, (iii) promoting the active sites concomitantly limiting the nanopowders agglomeration; and (iv) forming nano-heterojunctions. Herein, the aim of the present review is to highlight the above-mentioned hybrid features in order to engineer novel flexible, miniaturized and low working temperature sensors, able to detect specific VOC biomarkers of a human’s disease.

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“…Ethanol is a renewable resource which has great effect on food, transportation, and medical industries. On one hand, ethanol provides many conveniences for agricultural production and food processing; − however, on the other hand, abnormal ethanol concentrations can bring many hidden dangers, such as traffic accidents, health issues, industrial explosions, and medical accidents. − The same is true for other gases. Therefore, detection of gas concentration has a great significance. − So far, many sensors for detection of gas concentration have been studied extensively, especially ethanol sensors. − The response time of an ethanol sensor based on hierarchical SnO 2 /Zn 2 SnO 4 porous spheres is 2 s at 250 °C .…”

Section: Introductionmentioning

confidence: 99%

High-Sensitivity and Ultrafast-Response Ethanol Sensors Based on Graphene Oxide

Zhu

Zhang

Xie

et al. 2020

ACS Appl. Mater. Interfaces

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Ethanol sensors with ultrafast response and high sensitivity have attracted much attention to be applied to daily industrial production processes. In this work, graphene oxide–aniline (GOA) sensors are proposed to meet the requirements of detecting ethanol concentration. Graphene oxide is an outstanding material that has excellent electrical and thermal conductivity, large specific surface area, and high carrier mobility. Because of its special bonding reactions, GOA has advantages of good dispersibility, good electrical conductivity, insolubility in water, and strong plasticity. When testing ethanol concentration with sensors, there will be a lag time, which determines the sensitivity of the sensors. To the best of our knowledge, the GOA sensors in this work have the fastest response time, which is only 27 ms. The GOA ethanol sensors show a good ethanol sensing performance, including excellent sensitivity, cycle stability, and long-term stability.

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Layer-by-layer nanocomposites consisting of Co3O4 and reduced graphene (rGO) nanosheets for high selectivity ethanol gas sensors

Cited by 52 publications

References 43 publications

Construction of Hierarchical α‐Fe₂O₃/SnO₂ Nanoball Arrays with Superior Acetone Sensing Performance

Construction of Hierarchical α‐Fe₂O₃/SnO₂ Nanoball Arrays with Superior Acetone Sensing Performance

Breakthroughs in the Design of Novel Carbon-Based Metal Oxides Nanocomposites for VOCs Gas Sensing

High-Sensitivity and Ultrafast-Response Ethanol Sensors Based on Graphene Oxide

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Layer-by-layer nanocomposites consisting of Co3O4 and reduced graphene (rGO) nanosheets for high selectivity ethanol gas sensors

Cited by 52 publications

References 43 publications

Construction of Hierarchical α‐Fe2O3/SnO2 Nanoball Arrays with Superior Acetone Sensing Performance

Construction of Hierarchical α‐Fe2O3/SnO2 Nanoball Arrays with Superior Acetone Sensing Performance

Breakthroughs in the Design of Novel Carbon-Based Metal Oxides Nanocomposites for VOCs Gas Sensing

High-Sensitivity and Ultrafast-Response Ethanol Sensors Based on Graphene Oxide

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Construction of Hierarchical α‐Fe₂O₃/SnO₂ Nanoball Arrays with Superior Acetone Sensing Performance

Construction of Hierarchical α‐Fe₂O₃/SnO₂ Nanoball Arrays with Superior Acetone Sensing Performance