Helical polyacetylene heavily doped with iodine: Magnetotransport

Suh, Dongseok; Kim, T. J.; Алешин, А. Н.; Park, Y. W.; Piao, Guangzhe; Akagi, Kazuo; Shirakawa, Hideki; Qualls, J. S.; Han, S. Y.; Brooks, J. S.

doi:10.1063/1.1358837

Cited by 26 publications

(13 citation statements)

References 28 publications

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“…Weak localization predicts H 2 -dependent MC for weak fields and H 1/2 -dependent MC for strong field in a threedimensional ͑3D͒ system. [29][30][31][32][33] In the case of I@SWNT, the MC has H 2 dependence for H Ͻ 2 T below 12 K ͓Fig. 3͑a͔͒.…”

Section: B Resistivity At Zero Magnetic Fieldmentioning

confidence: 99%

Magnetotransport in iodine-doped single-walled carbon nanotubes

et al. 2009

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Magnetoresistance ͑MR͒ and magnetothermoelectric power ͑MTEP͒ of iodine-doped single-walled carbon nanotubes ͑I@SWNT͒ under magnetic fields up to 14 T are investigated from room temperature ͑300 K͒ down to 1.6 K. Our results on resistivity and thermoelectricpower ͑TEP͒ in a zero magnetic field are similar to those reported by Grigorian et al. ͓Phys. Rev. Lett. 80, 5560 ͑1998͔͒ The positive sign of the TEP values indicates that the majority of the carriers in the I@SWNT are holes. The broad enhancement of TEP at temperatures of 30-200 K shows quasilinear temperature dependence and is consistent with sharply varying density of states near the Fermi level with additional contribution from the spin-orbit scattering in the normal metallic characteristics of the I@SWNT. For T Ͻ 7 K, MR is negative and it decreases with H 2 followed by the H 1/2 dependence at around H = 2 T which is characteristic for the weak localization. In the range 7 KϽ T Ͻ 70 K, MR is positive at low magnetic field and becomes negative at higher magnetic field. The negative MR in the high magnetic fields decreases linearly. At T Ն ϳ 100 K, MR is positive up to 14 T, which could be the result of spin-orbit scattering in the I@SWNT. The MTEP decreases under magnetic field at T Ͻ 90 K. The reduction in MTEP is originated from the delocalization of electron wave functions under the magnetic field. At T Ͼ 90 K, the thermal fluctuation dominates the effect of magnetic fields resulting the MTEP to be the same as the zero magnetic field TEP.

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Section: B Resistivity At Zero Magnetic Fieldmentioning

confidence: 99%

Magnetotransport in iodine-doped single-walled carbon nanotubes

et al. 2009

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“…The MR of two kinds of iodine doped helical PA, R-and S-PA, were investigated by Suh et al, 26 to understand the effect of the intrafibrils and the interfibrillar interaction in the PA system. At low magnetic fields, a positive component of MR was observed and it depends sensitively on the zero-field resistivity ratio, r r = r(1.2 K)/r(300 K), value, and Dr(H) is a function of H/T.…”

Section: Magneto Resistance (Mr) Of Film Type Of Conducting Polymersmentioning

confidence: 99%

Magneto resistance of polyacetylene nanofibers

Park

2010

Chem. Soc. Rev.

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The magneto resistance (MR) of polyacetylene nanofibers is reviewed in this tutorial review. Earlier MR results on film types of polyacetylene and other conducting polymers are summarized first and then recent progress on the synthesis and characterization of conducting polymer nanofibers and tubes are surveyed. The studies on the dispersion and the MR measurements as well as the recent discovery of the vanishing magneto resistance (VMR) of polyacetylene nanofibers in high electric fields are reviewed. Comparing with the MR of polyaniline nanofibers, the deconfinement conduction of spinless charged solitons is introduced to understand the VMR of polyacetylene nanofibers in high electric fields.

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“…The amount of DL charge injection into the SWNT sheets is similar to that of the intermediately doped polyacetylene films, and they have comparable electrical conductivities. [12,13] The zero-charge-injection state in Figure 4B is defined as the state of SWNTs in air before DL charge injection. However, the position of the conductivity minimum indicates that about 0.001 holes per carbon exist in the SWNTs sample before charge www.afm-journal.de injection.…”

Section: Tuning and Retention Of The Conductivity Of Electrolytefree mentioning

confidence: 99%

Electrochemically Tuned Properties for Electrolyte‐Free Carbon Nanotube Sheets

Zakhidov

Suh

Кузнецов

et al. 2009

Adv Funct Materials

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Injecting high electronic charge densities can profoundly change the optical, electrical, and magnetic properties of materials. Such charge injection in bulk materials has traditionally involved either dopant intercalation or the maintained use of a contacting electrolyte. Tunable electrochemical charge injection and charge retention, in which neither volumetric intercalation of ions nor maintained electrolyte contact is needed, are demonstrated for carbon nanotube sheets in the absence of an applied field. The tunability of electrical conductivity and electron field emission in the subsequent material is presented. Application of this material to supercapacitors may extend their charge‐storage times because they can retain charge after the removal of the electrolyte.

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Helical polyacetylene heavily doped with iodine: Magnetotransport

Cited by 26 publications

References 28 publications

Magnetotransport in iodine-doped single-walled carbon nanotubes

Magnetotransport in iodine-doped single-walled carbon nanotubes

Magneto resistance of polyacetylene nanofibers

Electrochemically Tuned Properties for Electrolyte‐Free Carbon Nanotube Sheets

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