Nanocomposites SnO2/SiO2: SiO2 Impact on the Active Centers and Conductivity Mechanism

Gulevich, D.; Rumyantseva, M.; Marikutsa, A.; Shatalova, T.; Konstantinova, E.; Gerasimov, E.; Gaskov, A.

Авторы: Gulevich D., Rumyantseva M., Marikutsa A., Shatalova T., Konstantinova E., Gerasimov E., Gaskov A.
Журнал: Materials
Том: 12
Год издания: 2019
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 3618
DOI: 10.3390/ma12213618
Аннотация: This paper is focused on the effect of the stabilizing component SiO2 on the type and concentration of active sites in SnO2/SiO2 nanocomposites compared with nanocrystalline SnO2. Previously, we found that SnO2/SiO2 nanocomposites show better sensor characteristics in CO detection (lower detection limit, higher sensor response, and shorter response time) compared to pure SnO2 in humid air conditions. Nanocomposites SnO2/SiO2 synthesized using the hydrothermal method were characterized by low temperature nitrogen adsorption, XRD, energy dispersive X-ray spectroscopy (EDX), thermo-programmed reduction with hydrogen (TPR-H2), IR-, and electron-paramagnetic resonance (EPR)-spectroscopy methods. The electrophysical properties of SnO2 and SnO2/SiO2 nanocomposites were studied depending on the oxygen partial pressure in the temperature range of 200–400 ◦C. The introduction of SiO2 results in an increase in the concentration of paramagnetic centers Sn3+ and the amount of surface hydroxyl groups and chemisorbed oxygen and leads to a decrease in the negative charge on chemisorbed oxygen species. The temperature dependences of the conductivity of SnO2 and SnO2/SiO2 nanocomposites are linearized in Mott coordinates, which may indicate the contribution of the hopping mechanism with a variable hopping distance over local states.
Добавил в систему: Румянцева Марина Николаевна

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Nanocomposites SnO2/SiO2: SiO2 Impact on the Active Centers and Conductivity Mechanismстатья

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