Electro-graphitization and exfoliation of graphene on carbon nanofibers

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We present electrical current assisted graphitization as an alternative to conventional high temperature annealing of carbon nanofibers. In-situ experiments were performed on individual vapor grown carbon nanofibers inside a transmission electron microscope to measure the changes in resistance as a function of current density while observing the microstructural changes in real time. About 1000 times decrease in resistivity was measured at current density below 106 A/cm2. Further increase in current density leads to the uniform exfoliation of mostly bi-layer graphene flakes from the skin of the graphitic nanofibers, which leads to further reduction of the electrical resistance. The uniformity of the graphene flake growth over the nanofiber surface area achieved in this study is difficult to achieve with conventional approaches. Further experiments on networked nanofibers suggest that the graphene can remarkably reduce the electrical Kapitza resistance of the nanofiber junctions. The demonstrated processing of such hierarchical nanostructured fibers lead to high surface area and high conductivity carbon nanofibers that can impact flexible electrodes in electrochemical energy conversion or high specific strength composites applications.

Original languageEnglish (US)
Pages (from-to)201-207
Number of pages7
JournalCarbon
Volume117
DOIs
StatePublished - Jun 1 2017

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Graphitization
Carbon nanofibers
Graphite
Nanofibers
Graphene
Acoustic impedance
Current density
Energy conversion
Skin
Electron microscopes
Experiments
Vapors
Annealing
Electrodes
Fibers
Composite materials
Processing
Temperature

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

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title = "Electro-graphitization and exfoliation of graphene on carbon nanofibers",
abstract = "We present electrical current assisted graphitization as an alternative to conventional high temperature annealing of carbon nanofibers. In-situ experiments were performed on individual vapor grown carbon nanofibers inside a transmission electron microscope to measure the changes in resistance as a function of current density while observing the microstructural changes in real time. About 1000 times decrease in resistivity was measured at current density below 106 A/cm2. Further increase in current density leads to the uniform exfoliation of mostly bi-layer graphene flakes from the skin of the graphitic nanofibers, which leads to further reduction of the electrical resistance. The uniformity of the graphene flake growth over the nanofiber surface area achieved in this study is difficult to achieve with conventional approaches. Further experiments on networked nanofibers suggest that the graphene can remarkably reduce the electrical Kapitza resistance of the nanofiber junctions. The demonstrated processing of such hierarchical nanostructured fibers lead to high surface area and high conductivity carbon nanofibers that can impact flexible electrodes in electrochemical energy conversion or high specific strength composites applications.",
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Electro-graphitization and exfoliation of graphene on carbon nanofibers. / Wang, B.; Wolfe, Douglas Edward; Terrones Maldonado, Mauricio; Haque, Md Amanul; Ganguly, S.; Roy, A. K.

In: Carbon, Vol. 117, 01.06.2017, p. 201-207.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Electro-graphitization and exfoliation of graphene on carbon nanofibers

AU - Wang, B.

AU - Wolfe, Douglas Edward

AU - Terrones Maldonado, Mauricio

AU - Haque, Md Amanul

AU - Ganguly, S.

AU - Roy, A. K.

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AB - We present electrical current assisted graphitization as an alternative to conventional high temperature annealing of carbon nanofibers. In-situ experiments were performed on individual vapor grown carbon nanofibers inside a transmission electron microscope to measure the changes in resistance as a function of current density while observing the microstructural changes in real time. About 1000 times decrease in resistivity was measured at current density below 106 A/cm2. Further increase in current density leads to the uniform exfoliation of mostly bi-layer graphene flakes from the skin of the graphitic nanofibers, which leads to further reduction of the electrical resistance. The uniformity of the graphene flake growth over the nanofiber surface area achieved in this study is difficult to achieve with conventional approaches. Further experiments on networked nanofibers suggest that the graphene can remarkably reduce the electrical Kapitza resistance of the nanofiber junctions. The demonstrated processing of such hierarchical nanostructured fibers lead to high surface area and high conductivity carbon nanofibers that can impact flexible electrodes in electrochemical energy conversion or high specific strength composites applications.

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