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Surface Properties of SnO2 Nanowires Deposited on Si Substrate Covered by Au Catalyst Studies by XPS, TDS and SEM

1
Institute of Electronics, Silesian University of Technology, 44-100 Gliwice, Poland
2
SENSOR Lab, Department of Information Engineering (DII), Brescia University, 25123 Brescia, Italy
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(9), 738; https://doi.org/10.3390/nano8090738
Received: 27 July 2018 / Revised: 9 September 2018 / Accepted: 11 September 2018 / Published: 18 September 2018
(This article belongs to the Special Issue Development of Semiconductor Nanomaterials for Gas Sensors)
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Abstract

The surface chemistry and the morphology of SnO2 nanowires of average length and diameter of several µm and around 100 nm, respectively, deposited by vapor phase deposition (VPD) method on Au-covered Si substrate, were studied before and after subsequent air exposure. For this purpose, surface-sensitive methods, including X-ray photoelectron spectroscopy (XPS), thermal desorption spectroscopy (TDS) and the scanning electron microscopy (SEM), were applied. The studies presented within this paper allowed to determine their surface non-stoichiometry combined with the presence of carbon contaminations, in a good correlation with their surface morphology. The relative concentrations of the main components [O]/[Sn]; [C]/[Sn]; [Au]/[Sn], together with the O–Sn; O–Si bonds, were analyzed. The results of TDS remained in a good agreement with the observations from XPS. Moreover, conclusions obtained for SnO2 nanowires deposited with the use of Au catalyst were compared to the previous obtained for Ag-assisted tin dioxide nanowires. The information obtained within these studies is of a great importance for the potential application of SnO2 nanowires in the field of novel chemical nanosensor devices, since the results can provide an interpretation of how aging effects influence gas sensor dynamic characteristics. View Full-Text
Keywords: tin dioxide SnO2 nanowires; vapor phase deposition; surface chemistry; surface morphology tin dioxide SnO2 nanowires; vapor phase deposition; surface chemistry; surface morphology
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Kwoka, M.; Lyson-Sypien, B.; Kulis, A.; Zappa, D.; Comini, E. Surface Properties of SnO2 Nanowires Deposited on Si Substrate Covered by Au Catalyst Studies by XPS, TDS and SEM. Nanomaterials 2018, 8, 738.

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