Possible conduction mechanisms in coconut-shell activated carbon
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 throug...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Institute of Physics
1990
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| 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/ |
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| Summary: | 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. |
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