Influence of humidity on CO sensing with p-type CuO thick film gas sensors

Hübner, Michael; Simion, Cristian E.; Tomescu-Stănoiu, A.; Pokhrel, Suman; Bârsan, Nicolae; Weimar, Udo

doi:10.1016/j.snb.2010.10.046

Cited by 479 publications

(235 citation statements)

References 19 publications

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“…27 Among these metal oxide semiconductors, Co3O4 is believed to be a promising candidate for sensing of toluene and xylene because of its excellent catalytic activity for oxidizing them at low temperature which results from its larger adsorption amount of oxygen 28 on the surface than others and multivalent properties facilitating redox reactions. [29][30][31][32] Recently, vast research efforts have been spent on the synthesis of different Co3O4 nanostructures such as nanospheres, nanocubes, nanofibers, nanosheets, core-shell structures, etc. for use in gas sensing.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

et al. 2017

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The development of highly active, sensitive and durable gas sensing materials for the detection of volatile organic compounds (VOCs) is extremely desirable in gas sensors. Herein, a series of mesoporous hierarchical Co3O4-TiO2 p-n heterojunctions have been prepared for the first time via the facile thermal conversion of hierarchical CoTi layered double hydroxides (CoTi-LDH) precursors at 300-400 ºC. The resulting Co3O4-TiO2 nanocomposites showed superior sensing performance towards toluene and xylene in comparison with Co3O4 and TiO2 at low temperature, and the sample with a Co/Ti molar ratio of 4 shows optimal response (Rg/Ra = 113, Rg and Ra denote the sensor resistance in a target gas and in air, respectively) to 50 ppm xylene at 115 ºC. The ultrahigh sensing activity of theses Co3O4-TiO2 p-n heterojunctions originates from their hierarchical structure, high specific surface area (>120 m 2 g −1 ), and the formation of numerous p-n heterojunctions, which results in full exposure of active sites, easy adsorption of oxygen and target gases, and large modulation of resistance. Importantly, hierarchical Co3O4-TiO2 heterojunctions possess advantages of simple preparation, structural stability, good selectivity and long-term durability. Therefore, this work provides a facile approach for the preparation of hierarchical Co3O4-TiO2 p-n heterojunctions with excellent activity, sensitivity and durability, which can be used as a promising material for the development of high-performance gas sensors.

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Section: Introductionmentioning

confidence: 99%

Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

et al. 2017

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“…In this latter application, films of CuO were reported to detect O 3 , CO and C 5 H 2 OH among other chemical species [7][8][9]. Recently, the potential of CuO nanowires as building-blocks of new devices has been pointed out [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

Shao

Hernández-Ramírez

Prades

et al. 2014

Applied Surface Science

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Copper (II) oxide (CuO) is a metal oxide suitable for developing solid state gas sensors.Nevertheless, a detailed insight into the chemical-to-electrical transduction mechanisms between gas molecules and this metal oxide is still limited. Here, individual CuO nanowires were evaluated as ammonia (NH 3 ) and hydrogen sulphide (H 2 S) sensors, validating the p-type character of this semiconductor. The working principle behind their performance was qualitatively modelled and it was concluded that adsorbed oxygen at the surface plays a key role necessary to explain the experimental data. Compared to their counterparts of SnO 2 nanowires, an appreciable sensitivity enhancement to NH 3 for concentrations below 100 ppm was demonstrated.

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“…In addition to the higher surface area of the CuO nanotube sensor, it can also double the Debye length (about 3∼23 nm for CuO) due to the increased surfaces existing both inside and outside of the nanotubes, resulting in improved sensing [16][17][18].…”

Section: Resultsmentioning

confidence: 99%

H₂S Gas Sensing Properties of CuO Nanotubes

Kang¹,

Park²

2014

Applied Science and Convergence Technology

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CuO nanotubes are synthesized using TeO 2 nanorod templates for application to H 2 S gas sensors. TeO 2 nanorod templates were synthesized by using the VS method through thermal evaporation. Scanning electron microscopy, transmission electron microscopy and X-ray diffraction showed that the synthesized nanotubes were monoclinic-structured polycrystalline CuO with diameter and wall thickness of approximately 100∼300 nm and 5∼10 nm, respectively. The CuO nanotube sensor showed responses of 136∼325% for the H 2 S concentration of 0.1∼5 ppm at room temperature. These response values are approximately twice as high as that of the CuO nanowire sensor for the same concentrations of H 2 S gas.Along with the investigation of the performance of the sensors, the mechanisms of H 2 S gas sensing of the CuO nanotubes are also discussed in this study.

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Influence of humidity on CO sensing with p-type CuO thick film gas sensors

Cited by 479 publications

References 19 publications

Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

H₂S Gas Sensing Properties of CuO Nanotubes

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Influence of humidity on CO sensing with p-type CuO thick film gas sensors

Cited by 479 publications

References 19 publications

Facile synthesis of mesoporous hierarchical Co3O4–TiO2 p–n heterojunctions with greatly enhanced gas sensing performance

Facile synthesis of mesoporous hierarchical Co3O4–TiO2 p–n heterojunctions with greatly enhanced gas sensing performance

Copper (II) oxide nanowires for p-type conductometric NH3 sensing

H2S Gas Sensing Properties of CuO Nanotubes

Contact Info

Product

Resources

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Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

Facile synthesis of mesoporous hierarchical Co₃O₄–TiO₂ p–n heterojunctions with greatly enhanced gas sensing performance

H₂S Gas Sensing Properties of CuO Nanotubes