Possible conduction mechanisms in coconut-shell activated carbon

• Main Authors: W. Yusoff, W. Mohamad Daud, Badri, M., Hashim, Mansor
• Format: Article
• Language: English
• Published: American Institute of Physics 1990
• Online Access: http://psasir.upm.edu.my/id/eprint/39903/1/21%20-%20Possible%20conduction%20mechanisms%20in%20coconut-shell%20activated%20carbon.pdf; http://psasir.upm.edu.my/id/eprint/39903/

This work reports on the result of electrical conductivity measurements carried out on coconut-shell activated carbon. The results suggest that the charge carriers moved by variable-range hopping below 200 K, by hopping among localized energy states between 200 K and 385 K, and by percolation through energy states close to the mobility edge above 385 K. In the latter two conduction processes, significant additional frequency-dependent contributions to the conductivity were observed and are tentatively attributed to polarization of unremovable lignin and/or ionic impurities. These explanations are based on the present trends of the electrical transport theory for amorphous semiconductors.