Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5447235 | Journal of Physics and Chemistry of Solids | 2017 | 25 Pages |
Abstract
In this work, carbon-silica nanocomposites have been elaborated by sol-gel technique. SiO2 nanoparticles were added to resorcinol-formaldehyde (RF) carbon precursor solution with different silica weight percentages. The XRD investigations carried out on these samples outline that the material has amorphous phase. The transmission electron microscopy (TEM) images show the presence of nanostructures in RF-30% SiO2 and RF-50% SiO2 samples. The electrical conductivity was investigated in the temperature range 80-300Â K and in the frequency range 100 Hz-1 MHz. The dc and ac conductivity can be explained by hopping conduction model. Current-Voltage characteristics exhibit nonlinear and symmetric behavior for all measurement temperatures between 80Â K and 300Â K. In addition, a negative differential resistance (NDR) phase has been detected even at room temperature in RF-50% SiO2 non dispersive sample. These investigations will contribute to the fabrication of thermal and high voltage negatronic devices working at room temperature where NDR plays an important role.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
S. Gouadria, I. Najeh, L. El Mir,