Changes on the Surface of the SiO2/C Composite, Leading to the Formation of Conductive Carbon Structures with Complex Nature of DC Conductivity
| Autor: | Piotr Kupracz, Piotr Okoczuk, Tadeusz Miruszewski, Marcin Łapiński, L. Wicikowski |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Technology
Materials science nanographite silica/carbon composite Sintering chemistry.chemical_element 02 engineering and technology Conductivity 010402 general chemistry 01 natural sciences Article symbols.namesake X-ray photoelectron spectroscopy Electrical resistivity and conductivity General Materials Science DC conductivity Conductive polymer Microscopy QC120-168.85 research QH201-278.5 silica gel Engineering (General). Civil engineering (General) 021001 nanoscience & nanotechnology TK1-9971 0104 chemical sciences sol–gel Descriptive and experimental mechanics thin films Chemical engineering chemistry symbols Electrical engineering. Electronics. Nuclear engineering TA1-2040 0210 nano-technology Raman spectroscopy Temperature coefficient Carbon conductive polymers |
| Zdroj: | Materials Volume 14 Issue 9 Materials, Vol 14, Iss 2158, p 2158 (2021) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma14092158 |
| Popis: | Sol–gel layers have been the subject of many studies in recent decades. However, very little information exists about layers in which carbon structures are developed in situ. Using the spin-coating method, we obtained thin iron-doped SiO2/C composite films. The results of Raman spectroscopy showed that our samples consisted of graphitic forms and polymers. The latter’s contribution decreases with rising temperature. FTIR and EDS studies show changes in carbon distribution on top of the layer, depending on the sintering temperature. The samples sintered at 800 °C showed a significant increase in the contribution of carbon forms to the layer’s surface. Therefore, high conductivity can be observed in this sample. The results of XPS spectroscopy showed that the contribution of sp3 hybridized carbon increases after etching. The total electrical conductivity, studied by a DC four-wire technique, increased with the temperature and showed almost linear characteristics with significant changes below 150 K. The reduced activation energy plot has a positive temperature coefficient, which is a characteristic property of the conductive polymers in a metallic regime of conductivity. |
| Databáze: | OpenAIRE |
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