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Charge-Transfer Induced Magnetic Field Effects of Nano-Carbon Heterojunctions
Qin, Wei Gong, Maogang Shastry, Tejas Hersam, Mark C. Ren, Shenqiang
Qin, Wei
Gong, Maogang
Shastry, Tejas
Hersam, Mark C.
Ren, Shenqiang
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Abstract
Room temperature magnetic field effects have not been definitively observed in either single-walled carbon nanotubes (SWCNTs) or C60 under a small magnetic field due to their weak hyperfine interaction and slight difference of g-factor between positive and negative polarons. Here, we demonstrate charge-transfer induced magnetic field effects in nano-carbon C60-SWCNT bulk heterojunctions at room temperature, where the mechanism of magnetic field effects is verified using excited state transition modeling. By controlling SWCNT concentrations and interfacial interactions, nano-carbon heterojunctions exhibit tunability of charge-transfer density and room temperature magnetoconductance of 2.8% under 100 mT external magnetic field. External stimuli, such as electric field and photoexcitation, also play an important role in controlling the magnetic field effects of nano-carbon heterojunctions, which suggests that these findings could enable the control of optoelectronic properties of nano-carbon heterojunctions.
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2014-08-22
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Nature Publishing Group
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Wei Qin, Maogang Gong, Tejas Shastry, Mark C. Hersam, Shenqiang Ren. "Charge-Transfer Induced Magnetic Field Effects of Nano-Carbon Heterojunctions."
Sci Rep. 2014; 4: 6126. Published online 2014 August 22. http://dx.doi.org/10.1038/srep06126