| Title |
Noise spectroscopy of hybrid composites with carbon nanoparticles |
| Translation of Title |
Hibridinių kompozitų su anglies nanodalelėmis triukšminė spektroskopija. |
| Authors |
Wang, Zifan |
| Full Text |
|
| Pages |
39 |
| Keywords [eng] |
composite, carbon nanotubes, filler concentration, low frequency noise, charge transfer mechanisms |
| Abstract [eng] |
The aim of this work is to investigate the resistance and low frequency noise characteristics of composites with single-walled and multi-walled carbon nanotubes. Composite specific resistivity and low frequency noise (10 Hz to 20 kHz) was investigated under applied voltages from 4.5V to 55 V and temperatures ranging from 75 K to 365 K. Composites of varying sizes and of varying filler concentrations were investigated. The specific resistance and low frequency noise level of composite samples obtained from the top section of the material is higher and more variable than the resistivity and noise level of composite samples obtained from the side section of the material. The specific resistance of hybrid SWCNT/MWCNT composites is generally higher than that of single-filler SWCNT composites for the same total filler concentration by weight. Composite sample low frequency noise is predominantly 1/f type. The noise spectral density of composite samples with lower concentration filler is proportional to the voltage square, indicating that noise is due to the generation and recombination of charge carriers. For composite samples with higher concentration filler, the dependency of noise spectral density is more pronounced to the voltage, this situation is often related to tunneling in the material. For composite samples with lower total filler concentration, the temperature dependence of specific resistance follows the Arrhenius thermal activation model. |
| Dissertation Institution |
Vilniaus universitetas. |
| Type |
Master thesis |
| Language |
English |
| Publication date |
2026 |
