Dielectric parameters of activated carbon derived from rosewood and corncob

To make use of two waste natural corncob and rosewood, activated carbons are obtained through KOH activation at 1073 K. The two samples show sheet like morphology with some swells on the surface of the corncob activated carbon and pores in the rosewood activated carbon. The higher ID/IG value of rosewood activated carbon for the Raman spectrum measurement indicates its lower graphitization degree than corncob activated carbon, which is proved by X-ray diffraction patterns. The higher real and imaginary parts of the complex permittivity for the rosewood activated carbon are benefited from the differences of morphology and graphitization degree of the two samples. Apart from the dipole polarization, the charge polarization and interfacial polarization also contribute to the dielectric loss for the porous rosewood activated carbon.