Mesoporous Ultrathin SnO<sub>2</sub> Nanosheets in Situ Modified by Graphene Oxide for Extraordinary Formaldehyde Detection at Low Temperatures

Wang, Ding; Tian, Lei; Li, Huijun; Wan, Kechuang; Yu, Xin; Wang, Ping; Chen, Aiying; Yang, Jing

doi:10.1021/acsami.9b01465

Cited by 100 publications

(50 citation statements)

References 57 publications

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Section: Introductionmentioning

confidence: 99%

“…Highly sensitive room temperature (RT) gas sensors are increasingly demanding today because they are necessary in the fields of air quality monitoring and health care applications, and food safety. [13][14][15] As a kind of traditional sensing materials, metal oxide semiconductors can only work at high temperatures due to the presence of an activation energy. 13,[16][17][18] MXenes, as newly kind 2D materials, combine the rich surface terminations of function groups and high electrical conductivity, which indicates that they have the potential to make a great RT sensing material.…”

Section: Introductionmentioning

confidence: 99%

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High‐performance flexible sensing devices based on polyaniline/MXene nanocomposites

Zhao

Wang

Wei

et al. 2019

InfoMat

352

180

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Highly active two‐dimensional (2D) nanocomposites, integrating the unique merits of individual components and synergistic effects of composites, are greatly desired for flexible sensing device applications. Although 2D transition metal carbides and nitrides (MXenes) combined with their high metallic conductivity and versatile surface chemistry have shown its huge potential for sensing reactions, it still remains a major challenge to construct functional materials with intriguing sensing performance at room temperature (RT). Herein, we used an integration of density functional theory (DFT) simulations and bulk electrosensitive measurements to show high electrocatalytic sensitivity of polyaniline/MXene (PANI/Ti3C2T x) nanocomposites. Thanks to the synergistic properties of nanocomposites and high catalytic/absorption capacity of Ti3C2T x MXene, PANI nanoparticles are rationally decorated on Ti3C2T x nanosheet surface via in situ polymerization by low temperature approach to induce remarkable detection sensitivity, rapid response/recovery rate, and mechanical stability at RT. This study offers a versatile platform to use MXenes to fabricate 2D nanocomposites materials for high‐performance flexible gas sensors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐performance flexible sensing devices based on polyaniline/MXene nanocomposites

Zhao

Wang

Wei

et al. 2019

InfoMat

352

180

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“…The sensing process of the nanocomposites is mainly based on the chemical reaction between the sensing materials and different gas molecules. As shown in Figure 6a, when the gas sensors were exposed to air atmosphere, oxide molecules chemisorbed on the active surface of sensing materials were changed into various oxide species (O 2 − , O − , or O 2− ) [52]. The chemisorbed oxygen species depended on their working temperature.…”

Section: Gas Sensing Mechanismmentioning

confidence: 99%

“…The improved surface activity can make more oxide molecules adsorbed and ionized on the surface of sensing materials. Therefore, larger specific surface area of GO@SnO 2 NF/NSs is all beneficial to facilitate the improvement of the sensing properties for HCHO gas [52].…”

Section: Gas Sensing Mechanismmentioning

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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“…The first process is to sense gas via physical or chemical interactions with sensitive materials, which is called the sensitive process; the second process is to transduce the interactions to signals, which is called transduction. Various transduction technologies have been employed in the gas sensors, e.g., conductometric transduction converts redox reactions of gas molecules into electrical signals (Xing et al, 2015;Wang et al, 2019); optical transduction utilizes infrared spectral characteristics of gas molecules (Babeva et al, 2017); mass transduction measures weight of gas molecules using a microbalance, and converts it to a vibration frequency signal (Tu et al, 2015;Lv et al, 2018); electrochemical transduction is based on electron transfer between electrolyte and gas molecules (Zheng et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Gas Sensing by Microwave Transduction: Review of Progress and Challenges

Zheng

Hua

et al. 2019

Front. Mater.

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Microwave transduction is a novel research field in gas sensing owing to its simplicity, low cost, passive, and non-contact operations that indicate a huge potential in applications for gas sensing. At present, the study of microwave gas sensors is limited to testing the macroscopic performance of materials. Although the permittivity change of materials is the reason for microwave transduction, the knowledge of the fundamental mechanism is an urgent requirement for boosting the development of microwave gas sensors. In this review, we summarized the presented progresses of microwave gas sensors, including the performance of the different materials and propagative structures, as well as their sensitive signal. We have attempted to explain the sensitive mechanism of these materials, discuss the function of the propagative structure, and analyze the sensitive signal extracted from the parameters of electromagnetic waves. Finally, the challenges in the study of sensitive materials and propagative structures used in microwave gas sensors are analyzed. It is clear from the published literatures that microwave transduction provide a new route for gas detection, and it is expected that commercial manifestation will occur. The future research on microwave gas sensors will continue to exploit their sensitive materials and propagative structure for different applications. The understanding of the microscopic polarization interactions with gases will assist in and guide the fabrication of high-performance microwave gas sensors in the future.

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Mesoporous Ultrathin SnO₂ Nanosheets in Situ Modified by Graphene Oxide for Extraordinary Formaldehyde Detection at Low Temperatures

Cited by 100 publications

References 57 publications

High‐performance flexible sensing devices based on polyaniline/MXene nanocomposites

High‐performance flexible sensing devices based on polyaniline/MXene nanocomposites

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

Gas Sensing by Microwave Transduction: Review of Progress and Challenges

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Mesoporous Ultrathin SnO2 Nanosheets in Situ Modified by Graphene Oxide for Extraordinary Formaldehyde Detection at Low Temperatures

Cited by 100 publications

References 57 publications

High‐performance flexible sensing devices based on polyaniline/MXene nanocomposites

High‐performance flexible sensing devices based on polyaniline/MXene nanocomposites

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

Gas Sensing by Microwave Transduction: Review of Progress and Challenges

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Mesoporous Ultrathin SnO₂ Nanosheets in Situ Modified by Graphene Oxide for Extraordinary Formaldehyde Detection at Low Temperatures