Hydrothermally synthesized CeO2 nanowires for H2S sensing at room temperature

Li, Zhijie; Niu, Xinyue; Lin, Zhisheng; Wang, Ningning; Shen, Huahai; Liu, Wei; Sun, Kai; Fu, Yong Qing; Wang, Zhiguo

doi:10.1016/j.jallcom.2016.04.311

Cited by 70 publications

(18 citation statements)

References 39 publications

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“…The goal was to obtain experimental evidence supporting previous gas sensitivity data predicted from modeling studies, and to compare the experimental measurements to more recent molecular dynamics simulation results. We show that the WS 2 nanowire-nanoflake hybrids have particularly high sensitivity towards H 2 S, allowing detection and quantification of analyte concentrations on the order of parts per billion, competing with other known materials such as Fe 2 O 3 nanochains and nanoparticles [20,21], CuO-SnO 2 [22], CuO nanoparticles [23] and nanosheets [24], mesoporous WO 3 [25], CeO 2 nanowires [26], and PbS quantum dots [27] (for a comprehensive list, see Table S1 in the Electronic Supplementary Material (ESM)).…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials

et al. 2018

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Owing to their higher intrinsic electrical conductivity and chemical stability with respect to their oxide counterparts, nanostructured metal sulfides are expected to revive materials for resistive chemical sensor applications. Herein, we explore the gas sensing behavior of WS 2 nanowire-nanoflake hybrid materials and demonstrate their excellent sensitivity (0.043 ppm-1) as well as high selectivity towards H 2 S relative to CO, NH 3 , H 2 , and NO (with corresponding sensitivities of 0.002, 0.0074, 0.0002, and 0.0046 ppm-1 , respectively). Gas response measurements, complemented with the results of X-ray photoelectron spectroscopy analysis and first-principles calculations based on density functional theory, suggest that the intrinsic electronic properties of pristine WS 2 alone are not sufficient to explain the observed high sensitivity towards H 2 S. A major role in this behavior is also played by O doping in the S sites of the WS 2 lattice. The results of the present study open up new avenues for the use of transition metal disulfide nanomaterials as effective alternatives to metal oxides in future applications for industrial process control, security, and health and environmental safety.

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Section: Introductionmentioning

confidence: 99%

Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials

et al. 2018

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“…Deng and co-workers [33] have reported a high response and a remarkable selectivity towards hydrogen sulfide of mesoporous tungsten trioxide having large pore widths, but the reason for this selectivity is not discussed and cannot be easily explained based on the size of the pores within their nanomaterial. Zinc oxide nanomaterials (nanorods and dendritic) [26,27] or ceria nanowires [30] have been shown to be responsive towards hydrogen sulfide at room temperature, an interesting result for developing ultra-low power sensors; however, they show heavy cross-sensitivity to ambient humidity and rather slow response dynamics. Indium oxide shows poor selectivity to hydrogen sulfide with important nitrogen dioxide [34] and ethanol [29] cross-sensitivity.…”

Section: Metal Oxide Nanomaterialsmentioning

confidence: 99%

Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

Llobet

Brunet

Pauly

et al. 2017

Sensors

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This paper presents a focused review on the nanomaterials and associated transduction schemes that have been developed for the selective detection of hydrogen sulfide. It presents a quite comprehensive overview of the latest developments, briefly discusses the hydrogen sulfide detection mechanisms, identifying the reasons for the selectivity (or lack of) observed experimentally. It critically reviews performance, shortcomings, and identifies missing or overlooked important aspects. It identifies the most mature/promising materials and approaches for achieving inexpensive hydrogen sulfide sensors that could be employed in widespread, miniaturized, and inexpensive detectors and, suggests what research should be undertaken for ensuring that requirements are met.

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“…The concentration of the H2S gas was controlled by injecting different volumes of the H2S gas. The ratio of the resistance in detecting gas (Rg) and in air (Ra) was defined as the gas response (S) of the sensor [26,27]. Fig.…”

Section: Gas Sensor Based On Flower-like Cuo Nanostructuresmentioning

confidence: 99%

Hydrothermal synthesis of hierarchically flower-like CuO nanostructures with porous nanosheets for excellent H2S sensing

Wang

et al. 2017

Journal of Alloys and Compounds

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Flower-like CuO nanostructures with porous nanosheets were synthesized on alumina tube using a hydrothermal method without using any surfactant. The flowerlike CuO was comprised of interconnected nanosheets with a uniform thickness of 60 nm. These nanosheets had numerous nanoscale pores with diameters ranging from 20 nm to 160 nm. The copper complex ions of [Cu(NH3)4] 2+ and NH3 were identified to be critical for the formation of these flower-like CuO nanostructures with porous nanosheets during the hydrothermal process. Gas sensor to hydrogen sulfide (H2S) based on these porous flower-like CuO nanostructures exhibited high sensitivity, good reproducibility and long-term sensing stability when tested at room temperature of 25 o C. The gas sensor also showed a remarkably high sensing selectivity to the H2S gas. The gas sensing mechanism was investigated, and the formation of CuS on the surface of CuO nanostructure was identified to be critical for H2S sensing.

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Hydrothermally synthesized CeO2 nanowires for H2S sensing at room temperature

Cited by 70 publications

References 39 publications

Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials

Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials

Nanomaterials for the Selective Detection of Hydrogen Sulfide in Air

Hydrothermal synthesis of hierarchically flower-like CuO nanostructures with porous nanosheets for excellent H2S sensing

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