Multiphase graphitisation of carbon xerogels and its dependence on their pore size
| Autor: | Sara F. Villanueva, Miguel A. Montes-Morán, María Canal-Rodríguez, Luis A. Ramírez-Montoya, Samantha L. Flores-López, J. Angel Menéndez, Ana Arenillas |
|---|---|
| Přispěvatelé: | Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), Principado de Asturias, Arenillas de la Puente, Ana [0000-0002-5388-1169], Menéndez Díaz, José Ángel [0000-0003-3117-3337], Montes Morán, Miguel Ángel [0000-0002-8791-5582], Ramírez Montoya, Luis Adrián [0000-0002-3595-9663], Arenillas de la Puente, Ana, Menéndez Díaz, José Ángel, Montes Morán, Miguel Ángel, Ramírez Montoya, Luis Adrián |
| Rok vydání: | 2019 |
| Předmět: |
Nanostructure
Materials science Macropore chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Amorphous solid symbols.namesake chemistry Chemical engineering Transmission electron microscopy Electrical resistivity and conductivity symbols General Materials Science Crystallite 0210 nano-technology Raman spectroscopy Carbon |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 0008-6223 |
| DOI: | 10.1016/j.carbon.2019.06.057 |
| Popis: | Six carbon materials were obtained from the carbonisation of resorcinol/formaldehyde xerogels. All carbon xerogels (CXs) showed essentially the same microporosity but differed in their meso- or macroporosity, covering a wide interval of average meso- or macropore sizes from 10 nm to 3000 nm. The graphitisation of the CXs was heterogeneous, as detected by X-ray diffraction. The relative amount of the amorphous, turbostratic and graphitic carbon phases on the graphitised xerogels was different depending on the pore size of the CXs. Crystalline parameters such as interlayer spacings (d002) and crystallite sizes along the c-axis (Lc) were calculated from the different contributions and were also found to depend on the pore size of the parent CXs. Transmission electron microscopy and Raman spectroscopy analyses helped to identify nanostructures that could be assigned to the three carbon components of the graphitic xerogels. The occurrence of most of these nanostructures was compatible with a solid-phase transformation of the amorphous precursor. The electrical conductivity of the graphitised xerogels also depended on their original pore size, with values ranging from 2 S cm−1 for the materials with a 10 nm pore size to 18 S cm−1 for the materials with bigger pore sizes. |
| Databáze: | OpenAIRE |
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