Negative to positive magnetoresistance transition in functionalization of carbon nanotube and polyaniline composite
作者： Narendra Tanty , Ananya Patra , Krishna Prasad Maity , V Prasad
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摘要: Electrical resistivity and magnetoresistance(MR) in polyaniline(PANI) with carbon nanotube(CNT) functionalized nanotube(fCNT) composites have been studied for different weight percentages down to the temperature 4.2 K up magnetic field 5 T. Resistivity increases significantly composite at low due functionalization of CNT compared only CNT. Interestingly a transition from negative positive magnetoresistance has observed when filler is changed pure after certain percentage (10wt%) as effect more disorder fCNT/PANI composite. This result depicts that MR strong dependency on system. The explained basis polaron-bipolaron model. long range Coulomb interaction between two polarons screened by fCNT/PANI, effective on-site repulsion energy form bipolaron which leads change sign positive.
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