Preparation and gas sensing properties of hierarchical leaf-like SnO2 materials

Zhang, Yiqun; Li, Dan; Qin, Longgui; Zhao, Peilu; Liu, Fengmin; Chuai, Xiaohong; Sun, Peng; Liang, Xishuang; Gao, Yuan; Sun, Yanfeng

doi:10.1016/j.snb.2017.09.115

Cited by 49 publications

(17 citation statements)

References 48 publications

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“…The phase and composition of the final product was identified using XRD, and the obtained pattern is shown in Figure 1. The broad diffraction peaks with a pentagram mark in the XRD pattern are in accordance with the tetragonal rutile SnO 2 structure (JCPDS 41-1445), 28 while the crystal phase of the shell marked with a triangle can be indexed as that of NiO (JCPDS 47-1049), 29 thus confirming the presence of SnO 2 and NiO. In particular, the new peak is indicated by a solid circle mark corresponding to Sn-Ni, 30 which implies that the thermal reductive reaction proceeded during the preparation process of ACS@SnO 2 @NiO.…”

Section: Structural Characterizationsupporting

confidence: 67%

Activated carbon spheres (ACS)@SnO₂@NiO with a 3D nanospherical structure and its synergistic effect with AHP on improving the flame retardancy of epoxy resin

Líu

et al. 2019

Polymers for Advanced Techs

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A novel activated carbon spheres (ACS)@SnO2@NiO hierarchical hybrid architecture was first synthesized and applied for enhancing the flame retardancy of epoxy (EP) resin via a cooperative effect. Herein, using activated carbon microspheres as the template, SnO2 and NiO nanospheres were successively anchored to it by a sedimentation‐calcination strategy. The well‐designed ACS@SnO2@NiO significantly enhanced the flame retardancy for consistency of EP composites, as demonstrated by thermogravimetric and cone calorimeter experiments. For instance, the incorporation of 2 wt% ACS@SnO2@NiO decreased by 15.5% maximum in the total smoke production, accompanying the higher graphitized char layer. In addition, the synergetic mechanism of flame retardancy between ACS@SnO2@NiO and aluminum hypophosphite (AHP) was investigated. The obtained sample satisfied the UL‐94 V‐0 rating with a 5.0 wt% addition of AHP and ACS@SnO2@NiO (the ratio of the mass fraction of AHP to ACS@SnO2@NiO is 4.5:0.5). Notably, the incorporation of AHP and ACS@SnO2@NiO resulted in a significant decrease in the fire hazard properties of EP resin; for instance, 4.5AHP‐0.5ACS@SnO2@NiO/EP resulted in a maximum decrease of 32.4% in the total smoke production as compared with that of pure EP resin. It should be noted that the improved flame‐retardant performance for the EP composites is primarily attributed to the synergistic effect of ACS@SnO2@NiO and AHP in promoting the formation of residual char in the condensed phase.

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Section: Structural Characterizationsupporting

confidence: 67%

Activated carbon spheres (ACS)@SnO₂@NiO with a 3D nanospherical structure and its synergistic effect with AHP on improving the flame retardancy of epoxy resin

Líu

et al. 2019

Polymers for Advanced Techs

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“…In addition, Figure 6b shows that the majority of the pores of the SNM-8 are less than 20 nm in size, and the peak at approximately 13 nm in the pore size distribution curve might correspond to the gap between the nanosheets of SNM-8. Regarding the hysteresis loop of the pure NiO in the high-pressure range (0.8 < P/P 0 < 1), the powders might contain disordered mesopores and macropores according to the IUPAC classification [25,26]. Therefore, the pore size distribution of the pure NiO is disordered.…”

Section: Resultsmentioning

confidence: 99%

Highly Selective, ppb-Level Xylene Gas Detection by Sn2+-Doped NiO Flower-Like Microspheres Prepared by a One-Step Hydrothermal Method

Zheng

et al. 2019

Sensors

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Detecting xylene gas is an important means of avoiding human harm from gas poisoning. A precise measurement demands that the gas sensor used must have high sensitivity, high selectivity, and low working temperature. To meet these requirements, in this study, Sn2+-doped NiO flower-like microspheres (SNM) with different amounts of Sn2+ synthesized by a one-step hydrothermal process were investigated. The responses of gas sensors based on different Sn2+-doped NiO materials for various targeting gases were fully characterized. It was found that all of the synthesized materials exhibited the best gas response at a working temperature of 180 degrees, which was much lower than the previously reported working temperature range of 300–500 degrees. When exposed to 10 ppm xylene, the 8 at% Sn2+-doped NiO sensor (mol ratio) exhibited the highest response, with a value of 30 (Rg/Ra). More significantly, the detection limit of the 8 at% Sn2+-doped NiO sensor for xylene is down in the ppb level. The Sn2+-doped NiO material also exhibits excellent selectivity for other gases with long-term stability and repeatability. The significant improvement in the response to xylene can theoretically be attributed to a decrease in the intrinsic hole carrier concentration, higher amounts of adsorbed oxygen and active sites.

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“…This composite photocatalysts are usually constructed by coupling large band gap semiconductors for an increased redox ability, such as TiO 2 /ZnO , NiO/ZnO and Sn 2 Ta 2 O 7 /SnO 2 . Tin dioxide (SnO 2 ), a commonly used and chemical stable material, is a wide band gap semiconductor of 3.6 eV . According to the value of standard redox potential, ZnO has a high reduction potential, while SnO 2 has a high oxidation potential .…”

Section: Introductionmentioning

confidence: 99%

Morphology‐controlled Fabrication of SnO₂/ZnO Nanocomposites with Enhanced Photocatalytic Performance

Yao

Cao

et al. 2019

Photochem & Photobiology

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In this work, a series of novel SnO2/ZnO nanocomposites with different morphologies were fabricated via a facile hydrothermal technique followed by calcination in air. The morphological, structural and photocatalytic properties of the SnO2/ZnO nanocomposites were studied using different methods. The results showed that the synthesized nanocomposites possessed crystal phases of wurtzite hexagonal phase ZnO and tetragonal rutile phase SnO2. In addition, the morphologies of SnO2/ZnO nanocomposites strongly depended on the molar ratios of Sn and Zn. Compared with ZnO and SnO2, the SnO2/ZnO nanocomposites exhibited considerably higher degradation efficiency for the photodegradation of methylene blue and quinolone antibiotics under mercury lamp irradiation. The SZ‐2 nanospheres exhibited the highest degradation efficiency of 95.81%, which was about 2.63 times higher than that of ZnO nanoparticles. Moreover, the trapping experiments confirmed that ˙OH played the dominant role in MB degradation. Finally, the charge carriers potential transfer pathway and photocatalytic degradation mechanism were put forward. This study provides an economical way to prepare hybrid nanocomposites with controlled morphology for practical applications in the photocatalytic degradation of organic dyes and residual antibiotics.

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Preparation and gas sensing properties of hierarchical leaf-like SnO2 materials

Cited by 49 publications

References 48 publications

Activated carbon spheres (ACS)@SnO₂@NiO with a 3D nanospherical structure and its synergistic effect with AHP on improving the flame retardancy of epoxy resin

Activated carbon spheres (ACS)@SnO₂@NiO with a 3D nanospherical structure and its synergistic effect with AHP on improving the flame retardancy of epoxy resin

Highly Selective, ppb-Level Xylene Gas Detection by Sn2+-Doped NiO Flower-Like Microspheres Prepared by a One-Step Hydrothermal Method

Morphology‐controlled Fabrication of SnO₂/ZnO Nanocomposites with Enhanced Photocatalytic Performance

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Preparation and gas sensing properties of hierarchical leaf-like SnO2 materials

Cited by 49 publications

References 48 publications

Activated carbon spheres (ACS)@SnO2@NiO with a 3D nanospherical structure and its synergistic effect with AHP on improving the flame retardancy of epoxy resin

Activated carbon spheres (ACS)@SnO2@NiO with a 3D nanospherical structure and its synergistic effect with AHP on improving the flame retardancy of epoxy resin

Highly Selective, ppb-Level Xylene Gas Detection by Sn2+-Doped NiO Flower-Like Microspheres Prepared by a One-Step Hydrothermal Method

Morphology‐controlled Fabrication of SnO2/ZnO Nanocomposites with Enhanced Photocatalytic Performance

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Activated carbon spheres (ACS)@SnO₂@NiO with a 3D nanospherical structure and its synergistic effect with AHP on improving the flame retardancy of epoxy resin

Activated carbon spheres (ACS)@SnO₂@NiO with a 3D nanospherical structure and its synergistic effect with AHP on improving the flame retardancy of epoxy resin

Morphology‐controlled Fabrication of SnO₂/ZnO Nanocomposites with Enhanced Photocatalytic Performance