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arXiv · 1604.02365

Electron transport mechanisms in polymer-carbon sphere composites

Cesar A. Nieves·Idalia Ramos·Nicholas J. Pinto·Natalya A. Zimbovskaya
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Abstract

A set of uniform carbon microspheres (CS) whose diameters have the order of $ 0.125 \mu m$ to $10 \mu m $ was prepared from aqueous sucrose solution by means of hydrothermal carbonization of sugar molecules. A pressed pellet was composed by mixing CSs with polyethylene oxide (PEO). Electrical characterization of the pellet was carried out showing Ohmic current-voltage characteristics and temperature-dependent conductivity in the range $ 80K < T < 300K.$ The conductivity reached a maximum value of $ 0.245 S/cm $ at $ 258K. $ The dependence of conductivity on temperature was theoretically analyzed to determine predominating mechanisms of electron transport. It was shown that thermally-induced electron tunneling between adjacent spheres may take on an important part in the electron transport through the CS/PEO composites.

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Cesar A. Nieves, Idalia Ramos, Nicholas J. Pinto, Natalya A. Zimbovskaya. 2016-04-08. Electron transport mechanisms in polymer-carbon sphere composites. https://arxiv.org/abs/1604.02365

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