Large-scale synthesis of free-standing N-doped graphene using microwave plasma
| Autor: | Elena Tatarova, N. Bundaleska, Maria de Fátima Montemor, Miroslav Abrashev, Kush K. Upadhyay, Francisco Dias, B. Arnaudov, Ana Maria Ferraria, Amélia Almeida, E. Valcheva, A.M. Botelho do Rego, Julio Henriques |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Scanning electron microscope Analytical chemistry lcsh:Medicine 02 engineering and technology 010402 general chemistry 01 natural sciences 7. Clean energy Article law.invention symbols.namesake X-ray photoelectron spectroscopy law lcsh:Science Spectroscopy Multidisciplinary Graphene lcsh:R Doping technology industry and agriculture 021001 nanoscience & nanotechnology 0104 chemical sciences Transmission electron microscopy symbols lcsh:Q 0210 nano-technology Raman spectroscopy Microwave |
| Zdroj: | Scientific Reports Scientific Reports, Vol 8, Iss 1, Pp 1-11 (2018) |
| ISSN: | 2045-2322 |
| Popis: | Direct assembling of N-graphene, i.e. nitrogen doped graphene, in a controllable manner was achieved using microwave plasmas at atmospheric pressure conditions. The synthesis is accomplished via a single step using ethanol and ammonia as carbon and nitrogen precursors. Tailoring of the high-energy density plasma environment results in a selective synthesis of N-graphene (~0.4% doping level) in a narrow range of externally controlled operational conditions, i.e. precursor and background gas fluxes, plasma reactor design and microwave power. Applying infrared (IR) and ultraviolet (UV) irradiation to the flow of free-standing sheets in the post-plasma zone carries out changes in the percentage of sp2, the N doping type and the oxygen functionalities. X-ray photoelectron spectroscopy (XPS) revealed the relative extension of the graphene sheets π-system and the type of nitrogen chemical functions present in the lattice structure. Scanning Electron microscopy (SEM), Transmission Electron microscopy (TEM) and Raman spectroscopy were applied to determine morphological and structural characteristics of the sheets. Optical emission and FT-IR spectroscopy were applied for characterization of the high-energy density plasma environment and outlet gas stream. Electrochemical measurements were also performed to elucidate the electrochemical behavior of NG for supercapacitor applications. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|