title: Charge-transfer induced magnetic field effects of nano-carbon heterojunctions.
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.
authors.affiliation: Department of Chemistry, University of Kansas, Lawrence, KS 66045, United States.
authors.forename: Wei
authors.initials: W
authors.lastname: Qin
authors.affiliation: Department of Chemistry, University of Kansas, Lawrence, KS 66045, United States.
authors.forename: Maogang
authors.initials: M
authors.lastname: Gong
authors.affiliation: Department of Materials Science and Engineering and Department of Chemistry, Northwestern University, Evanston, IL 60208, United States.
authors.forename: Tejas
authors.initials: T
authors.lastname: Shastry
authors.affiliation: Department of Materials Science and Engineering and Department of Chemistry, Northwestern University, Evanston, IL 60208, United States.
authors.forename: Mark C
authors.initials: MC
authors.lastname: Hersam
authors.affiliation: Department of Chemistry, University of Kansas, Lawrence, KS 66045, United States.
authors.forename: Shenqiang
authors.initials: S
authors.lastname: Ren