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Article

Synergy Effect of Au and SiO2 Modification on SnO2 Sensor Properties in VOCs Detection in Humid Air

1
Chemistry Department, Moscow State University, 119991 Moscow, Russia
2
Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russia
3
LISM, Moscow State Technological University Stankin, 127055 Moscow, Russia
4
Bauman Moscow State Technical University, 105005 Moscow, Russia
*
Author to whom correspondence should be addressed.
Nanomaterials 2020, 10(4), 813; https://doi.org/10.3390/nano10040813
Received: 30 March 2020 / Revised: 16 April 2020 / Accepted: 19 April 2020 / Published: 23 April 2020
(This article belongs to the Special Issue Nanostructured Sensors)
Nanocomposites based on Au- and SiO2-modified SnO2 were studied as sensitive materials for ethanol and benzene detection in dry (RH = 1%) and humid (RH = 20%) air. Modification of SnO2 by amorphous SiO2 (13 mol.%) was effectuated by hydrothermal synthesis; modification by Au nanoparticles (1 wt.%) was carried out via impregnation by citrate-stabilized Au sol. The composition of the samples was determined by X-ray fluorescent spectroscopy and energy-dispersive X-ray spectroscopy. The microstructure was characterized by XRD, HRTEM, and low-temperature nitrogen adsorption. The surface groups were investigated by XPS, TPR-H2, and FTIR spectroscopy. DRIFT spectroscopy was performed to investigate the interaction between ethanol and the surface of the synthesized materials. Studies of the sensor properties have shown that in all cases the most sensitive is the SnO2/SiO2-Au nanocomposite. This material retains high sensitivity even in a humid atmosphere. The obtained results are discussed in terms of the synergistic effect of two modifiers (Au and SiO2) in the formation of sensor properties of SnO2/SiO2–Au nanocomposites. View Full-Text
Keywords: tin dioxide; silicon dioxide; Au clusters; hydrothermal synthesis; gas sensor; thermal stability; humid air; volatile organic compounds tin dioxide; silicon dioxide; Au clusters; hydrothermal synthesis; gas sensor; thermal stability; humid air; volatile organic compounds
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MDPI and ACS Style

Gulevich, D.; Rumyantseva, M.; Gerasimov, E.; Khmelevsky, N.; Tsvetkova, E.; Gaskov, A. Synergy Effect of Au and SiO2 Modification on SnO2 Sensor Properties in VOCs Detection in Humid Air. Nanomaterials 2020, 10, 813. https://doi.org/10.3390/nano10040813

AMA Style

Gulevich D, Rumyantseva M, Gerasimov E, Khmelevsky N, Tsvetkova E, Gaskov A. Synergy Effect of Au and SiO2 Modification on SnO2 Sensor Properties in VOCs Detection in Humid Air. Nanomaterials. 2020; 10(4):813. https://doi.org/10.3390/nano10040813

Chicago/Turabian Style

Gulevich, Dayana, Marina Rumyantseva, Evgeny Gerasimov, Nikolay Khmelevsky, Elena Tsvetkova, and Alexander Gaskov. 2020. "Synergy Effect of Au and SiO2 Modification on SnO2 Sensor Properties in VOCs Detection in Humid Air" Nanomaterials 10, no. 4: 813. https://doi.org/10.3390/nano10040813

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