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Electrical Conductivity Studies of Nanoporous Carbon Derived from Leather Waste: Effect of Pressure, Temperature and Porosity
Konikkara N, Aruldoss U, Vijaya J.J.,
Published in American Scientific Publishers
Volume: 16
Issue: 8
Pages: 8829 - 8838
Nanoporous carbons (NPC) were prepared from crust leather wastes at temperatures 600, 700, 800 and 900 °C are labelled as CLC6, CLC7, CLC8 and CLC9 respectively. DC electrical conductivities of these NPCs were determined by two-probe method. The effects of compression pressure on electrical conductivity were studied by varying the compression pressure ranging from 17 to 611 KPa. An increase in values of electrical conductivity (EC) was noted for all samples with increase in compression pressures. CLC9 showed relatively higher conductivity values compared to the samples prepared at temperatures. At a compression pressure of 611 KPa, the EC values for CLC6, CLC7, CLC8 and CLC9 were 4.82×10-2, 4.26×10-1, 1.32, 3.7 Ω-1m-1 respectively. The temperature dependent conductivities of NPCs such as CLC6, CLC7, CLC8 and CLC9 revealed that the energy band gap (Eg) values to be 0.455, 0.253, 0.175, 0.145 eV respectively. This Eg values indicate that the NPCs fall under the category of low band gap semiconducting materials. Nitrogen adsorption/desorption isotherms show mixed type with Type I at low relative pressure range (P/Po) and Type IV at high P/Po range indicating that NPCs consists of both micropores (pore diameter, d <2 nm) and mesopores (2 < d <50 nm) according to IUPAC classification. CLC8 possessed a maximum surface area of 716 m2/g estimated by Brunauer-Emmett-Teller (BET) method. Evolution of graphitic peaks was confirmed using Raman spectroscopy and X-ray diffraction techniques to support the electrical conduction mechanisms in NPCs. The surface morphology of the samples were observed using high resolution scanning electron microscope. Copyright © 2016 American Scientific Publishers.
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JournalData powered by TypesetJournal of Nanoscience and Nanotechnology
PublisherData powered by TypesetAmerican Scientific Publishers
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