Details
| Original language | English |
|---|---|
| Article number | 494002 |
| Journal | Journal of Physics Condensed Matter |
| Volume | 29 |
| Issue number | 49 |
| Publication status | Published - 15 Nov 2017 |
Abstract
In addition to the chemical and physical properties of nanostructures their successful utilization for applications is strongly triggered by economic aspects. Electrospinning of nanowires from solution followed by subsequent annealing steps is a comparably cheap technique to fabricate conductive carbon nanofibers (CNF) made from polyacrylonitrile (PAN) molecules in large quantities. In this work, we investigated the microscopic properties of the CNFs with diameters of 100-300 nm by means of Raman and x-ray photoelectron spectroscopy and correlated these results with transport measurements done with a 4-tip STM. In particular, we investigated the effect of fiber alignment and knot densities, which can be controlled by applying constant creep due to stress during the stabilization process. The comparison of the conductivity obtained from single CNFs revealed further that the fiber crossings within the ensemble structure act as scattering centers and proofs that the transport is along the surfaces of the CNFs.
Keywords
- 4-tip STM, carbon fibers, transport
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Journal of Physics Condensed Matter, Vol. 29, No. 49, 494002, 15.11.2017.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Highly anisotropic electric conductivity in PAN-based carbon nanofibers
AU - Aprojanz, Johannes
AU - Dreyer, B.
AU - Wehr, M.
AU - Wiegand, Julia Susan
AU - Baringhaus, J.
AU - Koch, Julian
AU - Renz, Franz
AU - Sindelar, Ralf
AU - Tegenkamp, Christoph
N1 - Funding information: This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG) and the Hannover School for Nanotechnology (hsn) within the Lower Saxony PhD-program.
PY - 2017/11/15
Y1 - 2017/11/15
N2 - In addition to the chemical and physical properties of nanostructures their successful utilization for applications is strongly triggered by economic aspects. Electrospinning of nanowires from solution followed by subsequent annealing steps is a comparably cheap technique to fabricate conductive carbon nanofibers (CNF) made from polyacrylonitrile (PAN) molecules in large quantities. In this work, we investigated the microscopic properties of the CNFs with diameters of 100-300 nm by means of Raman and x-ray photoelectron spectroscopy and correlated these results with transport measurements done with a 4-tip STM. In particular, we investigated the effect of fiber alignment and knot densities, which can be controlled by applying constant creep due to stress during the stabilization process. The comparison of the conductivity obtained from single CNFs revealed further that the fiber crossings within the ensemble structure act as scattering centers and proofs that the transport is along the surfaces of the CNFs.
AB - In addition to the chemical and physical properties of nanostructures their successful utilization for applications is strongly triggered by economic aspects. Electrospinning of nanowires from solution followed by subsequent annealing steps is a comparably cheap technique to fabricate conductive carbon nanofibers (CNF) made from polyacrylonitrile (PAN) molecules in large quantities. In this work, we investigated the microscopic properties of the CNFs with diameters of 100-300 nm by means of Raman and x-ray photoelectron spectroscopy and correlated these results with transport measurements done with a 4-tip STM. In particular, we investigated the effect of fiber alignment and knot densities, which can be controlled by applying constant creep due to stress during the stabilization process. The comparison of the conductivity obtained from single CNFs revealed further that the fiber crossings within the ensemble structure act as scattering centers and proofs that the transport is along the surfaces of the CNFs.
KW - 4-tip STM
KW - carbon fibers
KW - transport
UR - http://www.scopus.com/inward/record.url?scp=85038093977&partnerID=8YFLogxK
U2 - 10.1088/1361-648X/aa9494
DO - 10.1088/1361-648X/aa9494
M3 - Article
C2 - 29047449
AN - SCOPUS:85038093977
VL - 29
JO - Journal of Physics Condensed Matter
JF - Journal of Physics Condensed Matter
SN - 0953-8984
IS - 49
M1 - 494002
ER -