Surface Functionality Features of Porous Silicon Prepared and Treated in Different Conditions
| Autor: | Vyacheslav A. Moshnikov, M. F. Panov, A. O. Belorus, S. V. Mjakin, A. A. Bobkov, Yu. M. Spivak |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Surface (mathematics)
Materials science Article Subject Atomic force microscopy Anodizing Infrared spectroscopy Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Porous silicon 01 natural sciences 0104 chemical sciences Adsorption Chemical engineering lcsh:Technology (General) lcsh:T1-995 General Materials Science 0210 nano-technology Current density |
| Zdroj: | Journal of Nanomaterials, Vol 2016 (2016) |
| ISSN: | 1687-4129 1687-4110 |
| Popis: | Hydrophilic layers of porous silicon are prepared by single- or two-step anodization and characterized by evaluating their surface hydrophilicity and contents of functional groups using IR spectroscopy and adsorption of acid-base indicators with differentpKavalues. The surface functional composition of the synthesized samples is shown to be adjustable depending on the anodization current density. The surface of samples obtained at anodization current density 30 mA/cm2is predominantly occupied withpKa2.5 corresponding to ≡Si–OH groups. The increase of current density to 80 mA/cm2results in the increase of surface functional nonuniformity with the formation of versatile centers, primarily Lewis acidic sites corresponding to Si atoms, as indicated by selective indicator adsorption in agreement with the disappearance of Si–H bonds in IR spectra and overall surface disordering according to SEM and AFM data. |
| Databáze: | OpenAIRE |
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