Thermal hysteresis in the dielectric properties of composites based on transition metal oxide and sulfide nanoparticles stabilized in a low-density polyethylene matrix

Temperature dependence of the dielectric permittivity of poly(methyl methacrylate) filled with metal nanoparticles

“…2). The observed peaks can interpreted in the framework of a model proposed previously [2], as a manifestation of the generation of carriers due to the ionization of narrow impurity bands. The appearance of these changes in the energy band structure can be unambiguously related to the stabilization of Ag nano particles in the PMMA matrix…”

“…The existing qualitative models used to describe these properties [2] imply that the generation of carriers in the volume of nanoparti cles accounts for the appearance of polar elements in the polymer matrix.An analogous approach has been used in the present study for analysis of the properties of nano composites based on a poly(methyl methacrylate) (PMMA) matrix containing stabilized silver nanopar ticles. The obtained results are explained based on the assumption that the PMMA matrix is doped with an impurity in the form of stabilized nanoparticles.…”

“…The existing qualitative models used to describe these properties [2] imply that the generation of carriers in the volume of nanoparti cles accounts for the appearance of polar elements in the polymer matrix.…”

“…The influence of a distribution of the relaxation times is manifested by a weaker dependence of the permittivity on the frequency, which can be taken into account by introducing the effective complex permit tivity ε* as follows: (2) where 0 < α < 1, ε c is the permittivity at zero frequency, ε 0 is the permittivity of vacuum, ω is the frequency, and τ is the relaxation time. The closer α to unity, the more smeared is the distribution of relaxation times and the lower is the ε'' value at maximum.…”