University of Oulu

Mohl, M., Dombovari, A., Szabó, M., Järvinen, T., Pitkänen, O., Sápi, A., … Kordas, K. (2019). Size-Dependent H2 Sensing Over Supported Pt Nanoparticles. Journal of Nanoscience and Nanotechnology, 19(1), 459–464.

Size-dependent H₂ sensing over supported Pt nanoparticles

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Author: Mohl, Melinda1; Dombovari, Aron1; Szabó, Mária2;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, FI-90014 Oulu, Finland
2Department of Applied and Environmental Chemistry, University of Szeged, H-6720 Szeged, Hungary
3Department of Inorganic and Analytical Chemistry, University of Szeged, H-6720 Szeged, Hungary
4MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, H-6720 Szeged, Hungary
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 8 MB)
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Language: English
Published: American Scientific Publishers, 2019
Publish Date: 2020-06-05


Catalyst size affects the overall kinetics and mechanism of almost all heterogeneous chemical reactions. Since the functional sensing materials in resistive chemical sensors are practically the very same nanomaterials as the catalysts in heterogeneous chemistry, a plausible question arises: Is there any effect of the catalyst size on the sensor properties? Our study attempts to give an insight into the problem by analyzing the response and sensitivity of resistive H₂ sensors based on WO₃ nanowire supported Pt nanoparticles having size of 1.5±0.4 nm, 6.2±0.8 nm, 3.7±0.5 nm and 8.3±1.3 nm. The results show that Pt nanoparticles of larger size are more active in H₂ sensing than their smaller counterparts and indicate that the detection mechanism is more complex than just considering the number of surface atoms of the catalyst.

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Series: Journal of nanoscience and nanotechnology
ISSN: 1533-4880
ISSN-E: 1533-4899
ISSN-L: 1533-4880
Volume: 19
Issue: 1
Pages: 459 - 464
DOI: 10.1166/jnn.2019.15787
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
221 Nanotechnology
Funding: This paper was supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences and the ÚNKP-16-4 New National Excellence Program of the Ministry of Human Capacities as well as the Hungarian Research Development and Innovation Office through grants NKFIH OTKA PD 120877 of AS. ÁK and GH are grateful for the fund of NKFIH (OTKA) K112531 and PD 115769, respectively. This collaborative research was partially supported by the “Széchenyi 2020” program in the framework of GINOP-2.3.2-15-2016-00013 “Intelligent materials based on functional surfaces—from syntheses to applications” project. Furthermore funding received from the Academy of Finland (Suplacat), University of Oulu (project: More than Moore) and Infotech Oulu (project: Entity) is acknowledged.
Copyright information: © 2019 American Scientific Publishers. The Version of Record can be found online at: