Pt nanoparticles decorated SnO2 nanoneedles for efficient CO gas sensing applications

Zhou, Qu; Xu, Lingna; Umar, Ahmad; Chen, Weigen; Kumar, Rajesh

doi:10.1016/j.snb.2017.09.206

Cited by 220 publications

(73 citation statements)

References 98 publications

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“…Y. Liu et al [12] reported the hydrothermal synthesis of hierarchical SnO 2 nanostructures, which exhibited an excellent sensitivity to ethanol gas at a temperature of 300 • C. Sun et al [13] also fabricated SnO 2 hierarchical architectures by a hydrothermal synthesis method, and these SnO 2 structures demonstrated a superior high response to ethanol at the optimal operating temperature of 275 • C. Wei et al [14] successfully synthesized flower-like SnO 2 hierarchical nanostructures using SnSO 4 as the tin source and water as the solvent, and these nanostructures exhibited good n-butanol gas sensing properties at 160 • C. Sensing materials with porous structures, which create more channels for gas diffusion and reactions, have also been synthesized [15]. Noble metals such as Co [16], Au [17,18], Pt [19,20] and Ag [21] have been used to decorate the surface of SMOs to enhance gas adsorption and lower the reaction activation energy.…”

Section: Introductionmentioning

confidence: 99%

A Highly Sensitive and Selective ppb-Level Acetone Sensor Based on a Pt-Doped 3D Porous SnO2 Hierarchical Structure

Quan

Min

et al. 2020

Sensors

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In view of the low sensitivity, high operating temperature and poor selectivity of acetone measurements, in this paper much effort has been paid to improve the performance of acetone sensors from three aspects: increasing the surface area of the material, improving the surface activity and enhancing gas diffusion. A hierarchical flower-like Pt-doped (1 wt %) 3D porous SnO2 (3DPS) material was synthesized by a one-step hydrothermal method. The micropores of the material were constructed by subsequent annealing. The results of the experiments show that the 3DPS-based sensor's response is strongly dependent on temperature, exhibiting a mountain-like response curve. The maximum sensor sensitivity (Ra/Rg) was found to be as high as 505.7 at a heating temperature of 153 °C and with an exposure to 100 ppm acetone. Additionally, at 153 °C, the sensor still had a response of 2.1 when exposed to 50 ppb acetone gas. The 3DPS-based sensor also has an excellent selectivity for acetone detection. The high sensitivity can be explained by the increase in the specific surface area brought about by the hierarchical flower-like structure, the enhanced surface activity of the noble metal nanoparticles, and the rapid diffusion of free-gas and adsorbed gas molecules caused by the multiple channels of the microporous structure.

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Section: Introductionmentioning

confidence: 99%

A Highly Sensitive and Selective ppb-Level Acetone Sensor Based on a Pt-Doped 3D Porous SnO2 Hierarchical Structure

Quan

Min

et al. 2020

Sensors

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“…The φ = 75% In 2 O 3 sensor has a much higher S value up to 55.6 than the φ = 0% one ( S = 31.3), which is ascribed to the larger BET surface area and finer particle size. The sensing and recovering speeds were frequently estimated from the 90% response time ( τ res ) and 90% recovery time ( τ recov ), that is, the times reach 90% variation in the resistance upon exposure to sample gas and base gas, respectively . Therefore, both the two In 2 O 3 gas sensors made in this work exhibit rapid response and recovery time of approximate half an minute after sensing with NO 2 gas.…”

Section: Resultsmentioning

confidence: 99%

Morphology‐Controllable Synthesis of Cubic‐Structured In₂O₃ Particles with Enhanced NO₂ Gas Sensitivity

Lü

Pen

Zou

et al. 2018

Physica Status Solidi (a)

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A hydrated basic sulfate precursor for In2O3 is facilely prepared from the mixed indium nitrate and ammonium sulfate solutions via means of single‐step hydrolysis precipitation at a relatively low synthetic temperature of ≈60 °C, which subsequently converts to an oxide powder via pyrolyzing. The morphologies of the precursor and oxide can be controlled via adjusting volume fractions of ethanol‐water solvents. The pure water solvent in the reaction system leads to a thick two‐dimension plate‐like precursor and its oxide generally retains the original shape, while the addition of ethanol up to the volume fraction of 75% in the mother liquor is able to effectively reduce the thickness of the plates to result in well‐dispersed oxide powder with round morphology via partial split, full collapse, and particle growth processes. The as‐prepared In2O3 gas sensors have rapid response and recovery time to trace NO2 and the In2O3 gas sensor derived from the well‐dispersed oxide powder has a rather higher sensitivity than the agglomerated one.

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“…ZnO and SnO 2 belong to typical n-type semiconductors, characterized by their high free carrier concentration (Hong et al, 2017; Zhou et al, 2018d). The gas sensing mechanism of ZnO-SnO 2 nanofibers is shown in Figure 12.…”

Section: Resultsmentioning

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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Pt nanoparticles decorated SnO2 nanoneedles for efficient CO gas sensing applications

Cited by 220 publications

References 98 publications

A Highly Sensitive and Selective ppb-Level Acetone Sensor Based on a Pt-Doped 3D Porous SnO2 Hierarchical Structure

A Highly Sensitive and Selective ppb-Level Acetone Sensor Based on a Pt-Doped 3D Porous SnO2 Hierarchical Structure

Morphology‐Controllable Synthesis of Cubic‐Structured In₂O₃ Particles with Enhanced NO₂ Gas Sensitivity

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

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Pt nanoparticles decorated SnO2 nanoneedles for efficient CO gas sensing applications

Cited by 220 publications

References 98 publications

A Highly Sensitive and Selective ppb-Level Acetone Sensor Based on a Pt-Doped 3D Porous SnO2 Hierarchical Structure

A Highly Sensitive and Selective ppb-Level Acetone Sensor Based on a Pt-Doped 3D Porous SnO2 Hierarchical Structure

Morphology‐Controllable Synthesis of Cubic‐Structured In2O3 Particles with Enhanced NO2 Gas Sensitivity

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

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Morphology‐Controllable Synthesis of Cubic‐Structured In₂O₃ Particles with Enhanced NO₂ Gas Sensitivity