Size-dependent H2 sensing over supported Pt nanoparticles

Mohl, M. and Dombovari, A. and Szabó, Mária and Järvinen, T. and Pitkänen, O. and Sápi, András and Juhász, Koppány Levente and Kéri, Albert and Galbács, Gábor and Kukovecz, Ákos and Kónya, Zoltán and Kordás, Krisztián (2019) Size-dependent H2 sensing over supported Pt nanoparticles. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 19 (1). pp. 459-464. ISSN 1533-4880

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Abstract

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 H-2 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 H-2 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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