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Open AccessArticle

Influence of Mono- and Bimetallic PtOx, PdOx, PtPdOx Clusters on CO Sensing by SnO2 Based Gas Sensors

1
Chemistry Department, Moscow State University, 119991 Moscow, Russia
2
EMAT, University of Antwerp, B-2020 Antwerp, Belgium
3
LISM, Moscow State Technological University Stankin, 127055 Moscow, Russia
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(11), 917; https://doi.org/10.3390/nano8110917
Received: 17 October 2018 / Revised: 31 October 2018 / Accepted: 3 November 2018 / Published: 7 November 2018
(This article belongs to the Special Issue Development of Semiconductor Nanomaterials for Gas Sensors)
To obtain a nanocrystalline SnO2 matrix and mono- and bimetallic nanocomposites SnO2/Pd, SnO2/Pt, and SnO2/PtPd, a flame spray pyrolysis with subsequent impregnation was used. The materials were characterized using X-ray diffraction (XRD), a single-point BET method, transmission electron microscopy (TEM), and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) with energy dispersive X-ray (EDX) mapping. The electronic state of the metals in mono- and bimetallic clusters was determined using X-ray photoelectron spectroscopy (XPS). The active surface sites were investigated using the Fourier Transform infrared spectroscopy (FTIR) and thermo-programmed reduction with hydrogen (TPR-H2) methods. The sensor response of blank SnO2 and nanocomposites had a carbon monoxide (CO) level of 6.7 ppm and was determined in the temperature range 60–300 °C in dry (Relative Humidity (RH) = 0%) and humid (RH = 20%) air. The sensor properties of the mono- and bimetallic nanocomposites were analyzed on the basis of information on the electronic state, the distribution of modifiers in SnO2 matrix, and active surface centers. For SnO2/PtPd, the combined effect of the modifiers on the electrophysical properties of SnO2 explained the inversion of sensor response from n- to p-types observed in dry conditions. View Full-Text
Keywords: nanocrystalline semiconductor oxides; nanocomposites; tin oxide; platinum; palladium; bimetallic particles; carbon monoxide; gas sensor; response inversion nanocrystalline semiconductor oxides; nanocomposites; tin oxide; platinum; palladium; bimetallic particles; carbon monoxide; gas sensor; response inversion
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Kutukov, P.; Rumyantseva, M.; Krivetskiy, V.; Filatova, D.; Batuk, M.; Hadermann, J.; Khmelevsky, N.; Aksenenko, A.; Gaskov, A. Influence of Mono- and Bimetallic PtOx, PdOx, PtPdOx Clusters on CO Sensing by SnO2 Based Gas Sensors. Nanomaterials 2018, 8, 917.

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