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Sci Rep. 2014 Aug 22;4:6126. doi: 10.1038/srep06126.

Charge-transfer induced magnetic field effects of nano-carbon heterojunctions.

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Department of Chemistry, University of Kansas, Lawrence, KS 66045, United States.
Department of Materials Science and Engineering and Department of Chemistry, Northwestern University, Evanston, IL 60208, United States.


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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