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| Keywords | |
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Ni@C nanoparticles |
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Epoxy resin composite |
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Alignment |
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Negative temperature coefficient (NTC) |
| Authors | |
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Bangwen Zhang |
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Baowei Li |
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Changsheng Xie |
| PubMed | |
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Epoxy Resin/Nano Ni@C Composites Exhibiting NTC Effect with Tunable Resistivity
Bangwen Zhang1)†, Baowei Li1) and Changsheng Xie2)
1) School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China
2) College of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Epoxy resin/Ni@C nanoparticle composites with aligned microstructure were prepared by using a procedure of magnetic field assisted curing. The results show that the resistivity of composites exhibits negative temperature coefficient (NTC) effect above room temperature, and can be adjusted by varying the content filler and the magnitude of magnetic field applied. Hill0s quantum tunneling model was modified to understand the electrical conduction mechanism in the composites. It shows that the NTC effect ascribes to the dominant thermal activated tunneling transport of electron across adjacent nanoparticles, as well as the low thermal expansivity of epoxy resin matrix.
the National Natural Science Foundation of China under grant No. 50704021
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