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Ultrasensitive H2S gas sensors based on p-type WS2 hybrid materials
Univ Oulu, Finland.
Max Planck Inst Struct and Dynam Matter, Germany; Univ Basque Country, Spain.
Univ Oulu, Finland.
Univ Oulu, Finland.
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2018 (English)In: Nano Reseach, ISSN 1998-0124, E-ISSN 1998-0000, Vol. 11, no 8, p. 4215-4224Article in journal (Refereed) Published
Abstract [en]

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 WS2 nanowire-nanoflake hybrid materials and demonstrate their excellent sensitivity (0.043 ppm(-1)) as well as high selectivity towards H2S relative to CO, NH3, 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 WS2 alone are not sufficient to explain the observed high sensitivity towards H2S. A major role in this behavior is also played by O doping in the S sites of the WS2 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.

Place, publisher, year, edition, pages
TSINGHUA UNIV PRESS , 2018. Vol. 11, no 8, p. 4215-4224
Keywords [en]
WS2; nanowire; nanoflake; gas sensor; H2S; O doping
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-150217DOI: 10.1007/s12274-018-2009-9ISI: 000440733100023OAI: oai:DiVA.org:liu-150217DiVA, id: diva2:1240799
Note

Funding Agencies|Max Planck Society

Available from: 2018-08-22 Created: 2018-08-22 Last updated: 2018-09-11

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Lloyd Spetz, Anita
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Sensor and Actuator SystemsFaculty of Science & Engineering
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