Temperature dependent charge transport mechanisms in carbon sphere/polymer composites
| Autor: | Nicholas J. Pinto, Natalya A. Zimbovskaya, Anamaris Melendez, L. M. Martinez, Idalia Ramos, Margarita Ortiz, Cesar A. Nieves |
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| Rok vydání: | 2017 |
| Předmět: |
Analytical chemistry
General Physics and Astronomy FOS: Physical sciences 02 engineering and technology Conductivity 010402 general chemistry 01 natural sciences Variable-range hopping chemistry.chemical_compound Polyaniline Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Thin film Conductive polymer chemistry.chemical_classification Physics Condensed Matter - Mesoscale and Nanoscale Physics Doping Polymer Atmospheric temperature range 021001 nanoscience & nanotechnology lcsh:QC1-999 3. Good health 0104 chemical sciences chemistry 0210 nano-technology lcsh:Physics |
| Zdroj: | AIP Advances, Vol 7, Iss 12, Pp 125229-125229-7 (2017) |
| DOI: | 10.48550/arxiv.1704.02643 |
| Popis: | Carbon spheres (CS) with diameters in the range $2 - 10 ��m$ were prepared via hydrolysis of a sucrose solution at $200^o C,$ and later annealed in $N_2$ at $800^o C.$ The spheres were highly conducting but difficult to process into thin films or pressed pellets. In our previous work, composite samples of CS and the insulating polymer polyethylene oxide (PEO) were prepared and their charge transport was analyzed in the temperature range $ 80 K < T < 300 K. $ Here, we analyze charge transport in CS coated with a thin polyaniline (PANi) film doped with hydrochloric acid (HCl), in the same temperature range. The goal is to study charge transport in the CS using a conducting polymer (PANi) as a binder and compare with that occurring at CS/PEO. A conductivity maxima was observed in the CS/PEO composite but was absent in CS/PANi. Our data analysis shows that variable range hopping of electrons between polymeric chains in PANi-filled gaps between CS takes on a predominant part in transport through CS/PANi composites, whereas in CS/PEO composites, electrons travel through gaps between CS solely by means of direct tunneling. This difference in transport mechanisms results in different temperature dependences of the conductivity. 7 pages, 6 figures |
| Databáze: | OpenAIRE |
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