Scanning probe microscopy and microwave phenomena in composite containing iron nanoparticles and carbon nanotubes

• Published in: Fullerenes, nanotubes, and carbon nanostructures nanotubes, and carbon nanostructures, 2024-09, Vol.32 (9), p.817-827
• Main Authors: Korkh, Yulia V., Ryabukhin, Mikhail O., Kuznetsov, Engeny A., Perov, Dmitry V., Nemytova, Olga V., Klepikova, Anna C., Rinkevich, Anatoly B., Uimin, Mikhail A.
• Format: Article
• Language: English
• Subjects: Carbon nanotubes; Fe particles; ferromagnetic resonance; fractal dimension; magnetic composites; microwave properties; scanning probe microscopy
• ISSN: 1536-383X; 1536-4046
• DOI: 10.1080/1536383X.2024.2332626

Epoxyamine matrix-based composites containing 15 wt% of Fe nanoparticles and 1.5 or 2 wt% of carbon nanotubes, as well as composites containing only Fe particles, have been studied using microwave methods and various scanning probe microscopy techniques, such as scanning capacitance microscopy and scanning Kelvin probe force microscopy. The composites were prepared using technological methods that improve their homogeneity. Probe current dependences investigated by applying different voltages to the probe in the Kelvin probe force microscopy mode have shown that the falling regions of the dependences at both positive and negative values of the bias voltage are found only for the sample containing both the Fe particles and the CNT in the "soft epoxy" matrix. Microwave measurements of the transmission and reflection coefficients were performed in the frequency range from 26 to 38 GHz. The field dependences of the microwave power dissipation have been plotted. The ferromagnetic resonance in the composites has been investigated. Frequency dependences of the complex dielectric permittivity of the composites have been determined. Microwave properties of the CNT-containing and CNT-free composites have been compared.