Ultrasensitive H₂S gas sensors based on p-type WS₂ hybrid materials
|Author:||Asres, Georgies Alene1; Baldoví, José J.2,3; Dombovari, Aron1;|
1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu
2Max Planck Institute for the Structure and Dynamics of Matter
3Nano-Bio Spectroscopy Group, European Theoretical Spectroscopy Facility (ETSF), Universidad del País Vasco, CFM SCIC-UPV/EHU-MPC DIPC
4Technical Chemistry, Department of Chemistry, Chemical-Biological Centre, Umeå University
5School of Chemical Sciences and Engineering, School of Physics and Nanotechnology, Yachay Tech University
6Industrial Chemistry & Reaction Engineering, Department of Chemical Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University
7Sensor and Actuator Systems, Department of Physics, Chemistry and Biology, Linköping University
|Online Access:||PDF Full Text (PDF, 2.4 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2018092436432
|Publish Date:|| 2018-09-24
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, H₂, 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.
|Pages:||4215 - 4224|
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
213 Electronic, automation and communications engineering, electronics
216 Materials engineering
Funding received from Bio4Energy programme, Academy of Finland (projects Suplacat and ClintoxNP (No. 268944)), University of Oulu (More than Moore research community) and University of Oulu Graduate School (Infotech Oulu) is acknowledged. We acknowledge support from the EU (No. ERC-2016-AdG-694097 QSpec-NewMat) and the Basque Government “Grupos Consolidados UPV/EHU” (No. IT578-13). J. J. B. and L. D. X. thank the EU for the Marie Curie Fellowship (Nos. H2020-MSCA-IF-2016-751047 and H2020-MSCA-IF-2015-709382). A. P. P. thanks postdoctoral fellowship from the Spanish “Juan de la Cierva-incorporación” program (No. IJCI-2014-20147). A. L. S. acknowledges the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009-00971).
|Academy of Finland Grant Number:||
268944 (Academy of Finland Funding decision)
© The author(s) 2018. Open access funding provided by Max Planck Society. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.