Hydrothermal Synthesis of Hierarchical Ultrathin NiO Nanoflakes for High-Performance CH4 Sensing

Zhou, Qu; Lu, Zhaorui; Wei, Zhijie; Xu, Lingna; Gui, Yingang; Chen, Weigen

doi:10.3389/fchem.2018.00194

Cited by 50 publications

(18 citation statements)

References 18 publications

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“…For instance, Liu et al [15] synthesized porous NiO hierarchical microflowers with improved H 2 S gas sensing properties. Zhou et al [16] prepared hierarchical NiO nanoflakes using polyvinylpyrrolidone as a surfactant, which exhibited enhanced gas sensing properties for CH 4 detection. Ahirwar et al [17] 2 of 11 developed a sol-gel method to prepare porous NiO nanostructures using Tween-80 as a non-ionic surfactant and demonstrated excellent photocatalysis and sensing properties.…”

Section: Introductionmentioning

confidence: 99%

HMT-Controlled Synthesis of Mesoporous NiO Hierarchical Nanostructures and Their Catalytic Role towards the Thermal Decomposition of Ammonium Perchlorate

Guan

2019

Applied Sciences

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In this work, mesoporous nickel oxide (NiO) hierarchical nanostructures were synthesized by a facile approach by hydrothermal reaction and subsequent calcination. The phase structure, microstructure, element composition, surface area, and pore size distribution of the as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and the Brunauer-Emmett-Teller (BET) technique. The precursor of Ni 3 (NO 3 ) 2 (OH) 4 nanosheet, Ni 3 (NO 3 ) 2 (OH) 4 microsphere, and Ni(HCO 3 ) 2 sub-microsphere was obtained by hydrothermal reaction at 160 • C for 4 h when the ratio of Ni 2+ /HMT (hexamethylenetetramine) was 2:1, 1:2, and 1:3, respectively. After calcination at 400 • C for 2 h, the precursors were completely transformed to mesoporous NiO hierarchical nanosheet, microsphere, and sub-microsphere. When evaluated as additives of the thermal decomposition of ammonium perchlorate (AP), these NiO nanostructures significantly reduce the decomposition temperature of AP, showing obvious catalytic activity. In particular, NiO sub-microsphere have the best catalytic role, which can reduce the high temperature decomposition (HTD) and low temperature decomposition (LTD) temperature by 75.2 and 19.1 • C, respectively. The synthetic approach can easily control the morphology and pore structure of the NiO nanostructures by adjusting the ratio of Ni 2+ /HMT in the reactants and subsequent calcination, which avoids using expensive templates or surfactant and could be intended to prepare other transition metal oxide. Supplementary Materials:The following are available online at www.mdpi.com/xxx/s1, Figure S1:EDS spectrum of (a) NiO nanosheet; (b) NiO sub-microsphere, Figure S2: (a) Low-magnification TEM image, (b) highmagnification TEM image; and (c) HRTEM image of the precursor of Ni3(NO3)2(OH)4 microsphere.

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Section: Introductionmentioning

confidence: 99%

HMT-Controlled Synthesis of Mesoporous NiO Hierarchical Nanostructures and Their Catalytic Role towards the Thermal Decomposition of Ammonium Perchlorate

Guan

2019

Applied Sciences

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“…The advantage of the mixed-phase of CuO and In 2 O 3 is the low operating temperature sensor for methane gas. Many attempts for researchers were focused to fabricate a low-temperature methane sensor for safety control and reducing power consumption, but most of the proposed sensors are working at relatively high temperatures [1][2][3][4][5][6][7][8][9]. In the present study, we have successfully developed a sensor working at relatively low temperatures.…”

Section: Ch 4 Detection At Low Temperaturesmentioning

confidence: 95%

“…It is known that CH 4 is detected by a few materials at high operating temperatures. However, some literature reported developed materials that give a satisfactory performance to CH 4 at relatively high temperatures [1][2][3][4][5][6][7][8][9]. Among these materials, SnO 2 NR-NP-Gr hybrids and PdPt-SnO 2 -rGO which showed a promising property for methane at as low as 150 • C [2,10].…”

Section: Introductionmentioning

confidence: 99%

Co-Evaporated CuO-Doped In2O3 1D-Nanostructure for Reversible CH4 Detection at Low Temperatures: Structural Phase Change and Properties

2019

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In order to improve the sensitivity and to reduce the working temperature of the CH4 gas sensor, a novel 1D nanostructure of CuO-doped In2O3 was synthesized by the co-evaporation of Cu and In granules. The samples were prepared with changing the weight ratio between Cu and In. Morphology, structure, and gas sensing properties of the prepared films were characterized. The planned operating temperatures for the fabricated sensors are 50–200 °C, where the ability to detect CH4 at low temperatures is rarely reported. For low Cu content, the fabricated sensors based on CuO-doped In2O3 showed very good sensing performance at low operating temperatures. The detection of CH4 at these low temperatures exhibits the potential of the present sensors compared to the reported in the literature. The fabricated sensors showed also good reversibility toward the CH4 gas. However, the sensor fabricated of CuO-mixed In2O3 with a ratio of 1:1 did not show any response toward CH4. In other words, the mixed-phase of p- and n-type of CuO and In2O3 materials with a ratio of 1:1 is not recommended for fabricating sensors for reducing gas, such as CH4. The gas sensing mechanism was described in terms of the incorporation of Cu in the In2O3 matrix and the formation of CuO and In2O3 phases.

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“…Semiconductor metal oxides such as SnO 2 (Qi et al, 2014; Li et al, 2016; Shahabuddin et al, 2017; Zhou et al, 2018a), ZnO (Zhou et al, 2013; Zuo et al, 2013; Zhu et al, 2018), TiO 2 (Zeng et al, 2012; Park et al, 2017; Zhang Y. X. et al, 2018), NiO (Zhang Y. et al, 2016; Zhou et al, 2018b,c) are the most investigated group for gas sensors owing to their outstanding gas response and selectivity. Sensing nanostructure with high surface area and full electron depletion is advantageous to enhance the sensing performances (Hao et al, 2012; Miller et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Electrospun ZnO–SnO2 Composite Nanofibers and Enhanced Sensing Properties to SF6 Decomposition Byproduct H2S

Zhou

Wang

et al. 2018

Front. Chem.

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Hydrogen sulfide (H2S) is an important decomposition component of sulfur hexafluoride (SF6), which has been extensively used in gas-insulated switchgear (GIS) power equipment as insulating and arc-quenching medium. In this work, electrospun ZnO-SnO2 composite nanofibers as a promising sensing material for SF6 decomposition component H2S were proposed and prepared. The crystal structure and morphology of the electrospun ZnO-SnO2 samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively. The composition of the sensitive materials was analyzed by energy dispersive X-ray spectrometers (EDS) and X-ray photoelectron spectroscopy (XPS). Side heated sensors were fabricated with the electrospun ZnO-SnO2 nanofibers and the gas sensing behaviors to H2S gas were systematically investigated. The proposed ZnO–SnO2 composite nanofibers sensor showed lower optimal operating temperature, enhanced sensing response, quick response/recovery time and good long-term stability against H2S. The measured optimal operating temperature of the ZnO–SnO2 nanofibers sensor to 50 ppm H2S gas was about 250°C with a response of 66.23, which was 6 times larger than pure SnO2 nanofibers sensor. The detection limit of the fabricated ZnO–SnO2 nanofibers sensor toward H2S gas can be as low as 0.5 ppm. Finally, a plausible sensing mechanism for the proposed ZnO–SnO2 composite nanofibers sensor to H2S was also discussed.

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Hydrothermal Synthesis of Hierarchical Ultrathin NiO Nanoflakes for High-Performance CH4 Sensing

Cited by 50 publications

References 18 publications

HMT-Controlled Synthesis of Mesoporous NiO Hierarchical Nanostructures and Their Catalytic Role towards the Thermal Decomposition of Ammonium Perchlorate

HMT-Controlled Synthesis of Mesoporous NiO Hierarchical Nanostructures and Their Catalytic Role towards the Thermal Decomposition of Ammonium Perchlorate

Co-Evaporated CuO-Doped In2O3 1D-Nanostructure for Reversible CH4 Detection at Low Temperatures: Structural Phase Change and Properties

Electrospun ZnO–SnO2 Composite Nanofibers and Enhanced Sensing Properties to SF6 Decomposition Byproduct H2S

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