•  
  •  
 
Nano Research

Article Title

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

Authors

Georgies Alene Asres, Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
José J. Baldoví, Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany Nano-Bio Spectroscopy Group, European Theoretical Spectroscopy Facility (ETSF), Universidad del País Vasco, CFM SCIC-UPV/EHUMPC DIPC, Avenida Tolosa 72, 20018 San Sebastian, Spain
Aron Dombovari, Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Topias Jrvinen, Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Gabriela Simone Lorite, Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Melinda Mohl, Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
Andrey Shchukarev, Technical Chemistry, Department of Chemistry, Chemical-Biological Centre, Ume University, SE-90187 Ume, Sweden
Alejandro Pérez Paz, Nano-Bio Spectroscopy Group, European Theoretical Spectroscopy Facility (ETSF), Universidad del País Vasco, CFM SCIC-UPV/EHUMPC DIPC, Avenida Tolosa 72, 20018 San Sebastian, Spain School of Chemical Sciences and Engineering, School of Physics and Nanotechnology, Yachay Tech University, Urcuquí, Ecuador
Lede Xian, Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany Nano-Bio Spectroscopy Group, European Theoretical Spectroscopy Facility (ETSF), Universidad del País Vasco, CFM SCIC-UPV/EHUMPC DIPC, Avenida Tolosa 72, 20018 San Sebastian, Spain
Jyri-Pekka Mikkola, Technical Chemistry, Department of Chemistry, Chemical-Biological Centre, Ume University, SE-90187 Ume, Sweden Industrial Chemistry & Reaction Engineering, Department of Chemical Engineering, Johan Gadolin Process Chemistry Centre, bo Akademi University, FI-20500 bo-Turku, Finland
Anita Lloyd Spetz, Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland Sensor and Actuator Systems, Department of Physics, Chemistry and Biology, Linkping University, SE-58183 Linkping, Sweden
Heli Jantunen, Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
ngel Rubio, Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany Nano-Bio Spectroscopy Group, European Theoretical Spectroscopy Facility (ETSF), Universidad del País Vasco, CFM SCIC-UPV/EHUMPC DIPC, Avenida Tolosa 72, 20018 San Sebastian, Spain
Krisztian Kordas, Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland

Keywords

WS2, nanowire, nanoflake, gas sensor, H2S, O doping

Abstract

ABSTRACT 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.

Graphical Abstract

Publisher

Tsinghua University Press

Share

COinS