Highly sensitive carbon monoxide (CO) gas sensors based on Ni and Zn doped SnO2 nanomaterials

Zhou, Qu; Chen, Weigen; Xu, Lingna; Kumar, Rajesh; Gui, Yingang; Zhao, Zhongyong; Zhu, Shiping

doi:10.1016/j.ceramint.2017.12.038

Cited by 200 publications

(89 citation statements)

References 60 publications

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“…Secondly, Ag nanoparticles can act as active site to reduce the reaction barrier between H 2 and the adsorbed oxygen species due to its good catalytic ability, which results in a further extend in width of the depleted layer [23]. In addition, Ag nanoparticle has a tendency to form Ag 2 O in the air and Ag 2 O is a kind of p type semiconductor that will further intense electron depletion layer on the sensors surface [27,41]. Meanwhile, as shown in Figure 11e,f, the presence of Ag nanoparticle favors the gas sensing response by the process of chemical sensitization, catalytic oxidation (spill-over effect), resulting in increasing the quantities of active oxygen species on the surface of the Ag-doping SnO 2 nanocomposite [34,42].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Highly Sensitive Hydrogen (H2) Sensing Device Based on Ag Doped SnO2 Nanospheres

Zhou

et al. 2018

Materials

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In this paper, pure and Ag-doped SnO2 nanospheres were synthesized by hydrothermal method and characterized via X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and X-ray photoelectron spectra (XPS), respectively. The gas sensing performance of the pure, 1 at.%, 3 at.%, and 5 at.% Ag-doped SnO2 sensing devices toward hydrogen (H2) were systematically evaluated. The results indicated that compared with pure SnO2 nanospheres, Ag-doped SnO2 nanospheres could not only decrease the optimum working temperature but also significantly improve H2 sensing such as higher gas response and faster response-recovery. Among all the samples, the 3 at.% Ag-doped SnO2 showed the highest response 39 to 100 μL/L H2 at 300 °C. Moreover, its gas sensing mechanism was discussed, and the results will provide reference and theoretical guidance for the development of high-performance SnO2-based H2 sensing devices.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Highly Sensitive Hydrogen (H2) Sensing Device Based on Ag Doped SnO2 Nanospheres

Zhou

et al. 2018

Materials

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“…The thickness of depletion layer depends upon the degree of the electrons lost from the conduction band near the surface. The conversion of chemisorbed O 2 to the different oxygen adsorbed species were shown in Equations –

O_{2} (g a s) + e^{-} \leftrightarrow O_{2}^{-} (a d s o r b)

\frac{1}{2} O_{2} + e^{-} \overset{k_{O x y g e n}}{\leftrightarrow} O_{a d s}^{-}

\frac{1}{2} O_{2} + 2 e^{-} \overset{k_{O x y g e n}}{\leftrightarrow} O_{a d s}^{2 -}

…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, transition metal and metal oxide doped acting as a foreigner additive could alter the sensing properties of sensor . Zhou et al successfully improved CO sensing response of SnO 2 nanomaterials by using Ni and Zn as doping resources . Those dopants not only improved sensing response but also decreased response and recovery times of sensors.…”

Section: Introductionmentioning

confidence: 99%

Size‐Independent and Ultrahigh CO Gas Sensor Based on TiO₂ Modified ZnO Tetrapods

Santhaveesuk

Shimanoe

Suematsu

et al. 2018

Physica Status Solidi (a)

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ZnO tetrapods modified by TiO 2 powder are synthesized using a simple fast thermal oxidation method, and theirs CO sensing properties are investigated. The ZnO tetrapods modified by TiO 2 powder sensor is tested at 250-400 C under different CO concentrations compared with pure ZnO tetrapods, ZnO nanoparticle, and ZnO powder sensors. With a good crystallinity and a high pore size, the ZnO tetrapods modified by TiO 2 powder sensor shows the highest sensing response compared to other sensors, exhibiting a size-independent property for CO. Additionally, the response time of ZnO tetrapods modified by TiO 2 powder sensor is reduced. The improvement of the sensing properties is attributed to microstructure, lattice, surface area, and conductance modification of TiO 2 additive together with a high diffusion process deeply inside the sensing layer through the large pore size.

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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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Highly sensitive carbon monoxide (CO) gas sensors based on Ni and Zn doped SnO2 nanomaterials

Cited by 200 publications

References 60 publications

Synthesis and Characterization of Highly Sensitive Hydrogen (H2) Sensing Device Based on Ag Doped SnO2 Nanospheres

Synthesis and Characterization of Highly Sensitive Hydrogen (H2) Sensing Device Based on Ag Doped SnO2 Nanospheres

Size‐Independent and Ultrahigh CO Gas Sensor Based on TiO₂ Modified ZnO Tetrapods

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

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Highly sensitive carbon monoxide (CO) gas sensors based on Ni and Zn doped SnO2 nanomaterials

Cited by 200 publications

References 60 publications

Synthesis and Characterization of Highly Sensitive Hydrogen (H2) Sensing Device Based on Ag Doped SnO2 Nanospheres

Synthesis and Characterization of Highly Sensitive Hydrogen (H2) Sensing Device Based on Ag Doped SnO2 Nanospheres

Size‐Independent and Ultrahigh CO Gas Sensor Based on TiO2 Modified ZnO Tetrapods

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

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Size‐Independent and Ultrahigh CO Gas Sensor Based on TiO₂ Modified ZnO Tetrapods