Электронный каталог

Статья

Ahmadova, S.A.
Investigation of Defect States, Free Volume, and Interphase Interactions in *b-Ga&sub(2)O&sub(3)/CNT Polymer Nanocomposites / S.A.Ahmadova, S.F.Samadov, I.I.Vinogradov, A.A.Sidorin, D.M.Mirzayeva, P.Th.Le, M.N.Mirzayev, [a.o.]. – Text : electronic // Physica E. – 2026. – Vol. 177. – P. 116450. – URL: https://doi.org/10.1016/j.physe.2025.116450. – Bibliogr.: 70.

Breakthrough innovations continue in the field of developing and studying new-generation materials with superior optical and mechanical properties. In this research, we investigated the defect characteristics, as well as the modification of the local bonding environment and interphase interactions, in a nanocomposite material formed by incorporating *b-Ga&sub(2)O&sub(3) and carbon nanotubes (CNTs) into a polyvinylidene fluoride (PVDF) matrix using positron annihilation lifetime spectroscopy (PALS) and Raman spectroscopy. Raman studies show that the D and G bands, which are indicators of the structural quality of carbon nanotubes, exhibit weak additional vibrational modes that can be associated with distortions of the *b-Ga&sub(2)O&sub(3) lattice and modifications of the local Ga–O coordination environment, rather than with the ideal crystalline structure. The observed peak shifts and intensity changes indicate a transition of the interphase interaction into an amorphous state, accompanied by the formation of internal structural stress and defect centers. With increasing *b-Ga&sub(2)O&sub(3) concentration in the composite material, the decrease in the ID/IG ratio reveals the formation of chemical bonds that strengthen the oxide layer on the surface of the carbon nanotubes. PALS analysis results clearly demonstrated that the type and size of defects strongly depend on the ratio of Ga&sub(2)O&sub(3) to carbon nanotubes in the composite. In pure *b-Ga&sub(2)O&sub(3) structures, medium-sized vacancy clusters (*t&sub(2) = 369 ps) are present, while in carbon nanotubes (*t&sub(2) = 685 ps), and in the composite samples based on them, the *t&sub(2) component increases up to 853 ps. Analysis based on the two-state trapping model showed that the changes in the *tb, kd, and *t&sub(2) – *tb parameters indicate the occurrence of porosity and defect clustering processes in the composite structure depending on the CNT and *b-Ga&sub(2)O&sub(3) ratios. The obtained results suggest that new polymer-based composite materials with highly porous structures can serve as fundamental elements in sensor technology, optoelectronic devices, and radiation-resistant equipment.



Спец.(статьи,препринты) = С 350 - Приложения методов ядерной физики в смежных областях
Спец.(статьи,препринты) = С 33 а - Нанофизика. Нанотехнология$
ОИЯИ = ОИЯИ (JINR)2026