Charge-Transfer induced magnetic field effects of nano-carbon heterojunctions

Wei Qin; Maogang Gong; Tejas Shastry; Mark C. Hersam; Shenqiang Ren

doi:10.1038/srep06126

Charge-Transfer induced magnetic field effects of nano-carbon heterojunctions

Wei Qin^*, Maogang Gong, Tejas Shastry, Mark C. Hersam, Shenqiang Ren

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

Room temperature magnetic field effects have not been definitively observed in either single-walled carbon nanotubes (SWCNTs) or C 60 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 C 60-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 100â 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.

Original language	English (US)
Article number	6126
Journal	Scientific reports
Volume	4
DOIs	https://doi.org/10.1038/srep06126
State	Published - Aug 22 2014

Funding

S.R. thanks the financial support from the Army Research Office - Young Investigator Award (W911NF-14-1-0443) for nanocarbon self-assembly and optoelectronics, and US Department of Energy award (DE-FG02-13ER46937) for organic magnetic study. M.C.H. acknowledges funding from the National Science Foundation (DMR-1006391). T.S. is supported by a National Science Foundation Graduate Research Fellowship and the ANSER Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DE-SC0001059.

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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 C 60 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 C 60-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{\^a} 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.",

author = "Wei Qin and Maogang Gong and Tejas Shastry and Hersam, {Mark C.} and Shenqiang Ren",

note = "Funding Information: S.R. thanks the financial support from the Army Research Office - Young Investigator Award (W911NF-14-1-0443) for nanocarbon self-assembly and optoelectronics, and US Department of Energy award (DE-FG02-13ER46937) for organic magnetic study. M.C.H. acknowledges funding from the National Science Foundation (DMR-1006391). T.S. is supported by a National Science Foundation Graduate Research Fellowship and the ANSER Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DE-SC0001059.",

year = "2014",

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doi = "10.1038/srep06126",

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AU - Qin, Wei

AU - Gong, Maogang

AU - Shastry, Tejas

AU - Hersam, Mark C.

AU - Ren, Shenqiang

N1 - Funding Information: S.R. thanks the financial support from the Army Research Office - Young Investigator Award (W911NF-14-1-0443) for nanocarbon self-assembly and optoelectronics, and US Department of Energy award (DE-FG02-13ER46937) for organic magnetic study. M.C.H. acknowledges funding from the National Science Foundation (DMR-1006391). T.S. is supported by a National Science Foundation Graduate Research Fellowship and the ANSER Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award Number DE-SC0001059.

PY - 2014/8/22

Y1 - 2014/8/22

N2 - Room temperature magnetic field effects have not been definitively observed in either single-walled carbon nanotubes (SWCNTs) or C 60 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 C 60-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 100â 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.

AB - Room temperature magnetic field effects have not been definitively observed in either single-walled carbon nanotubes (SWCNTs) or C 60 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 C 60-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 100â 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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Charge-Transfer induced magnetic field effects of nano-carbon heterojunctions

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