Glow Peak Analysis of Pure and Doped Naphthalene Thermoelectret

Abstract

Polarization current for pure and doped naphthalene thermoelectrets is investigated. The thermal depolarization of the electret is used as a technique to investigate trapped polarization. Doped crystals with alpha and beta naphtol present new independent peaks in addition to the pure matrix peaks. The peaks are analyzed quantitatively for total integrated charge and activation energy by the initial rise method. The OH vibrational band of the impurities was used as an optical probe to detect their presence in the solid. Charges trapped in the dielectric absorption process corrected for the released charge at the low‐temperature depolarization, compare satisfactorily with the total integrated glow peak charge for both pure and doped samples. It was possible to differentiate between alpha and beta naphtol through the electret behavior using the glow peak position and activation energy of the peaks. The electret state is shown to be due to electronic carriers, trapped in a set or sets of exponentially distributed traps, as indicated by the atn dependence of the polarization current on time.