Local Structure and Bonding of Carbon Nanothreads Probed by High-Resolution Transmission Electron Microscopy

Stephen J. Juhl, Tao Wang, Brian Vermilyea, Xiang Li, Vincent Henry Crespi, John V. Badding, Nasim Alem

Research output: Contribution to journalArticle

Abstract

Carbon nanothreads are a new one-dimensional sp3-bonded nanomaterial of CH stoichiometry synthesized from benzene at high pressure and room temperature by slow solid-state polymerization. The resulting threads assume crystalline packing hundreds of micrometers across. We show high-resolution electron microscopy (HREM) images of hexagonal arrays of well-aligned thread columns that traverse the 80-100 nm thickness of the prepared sample. Diffuse scattering in electron diffraction reveals that nanothreads are packed with axial and/or azimuthal disregistry between them. Layer lines in diffraction from annealed nanothreads provide the first evidence of translational order along their length, indicating that this solid-state reaction proceeds with some regularity. HREM also reveals bends and defects in nanothread crystals that can contribute to the broadening of their diffraction spots, and electron energy-loss spectroscopy confirms them to be primarily sp3-hybridized, with less than 27% sp2 carbon, most likely associated with partially saturated "degree-4" threads.

Original languageEnglish (US)
Pages (from-to)6937-6945
Number of pages9
JournalJournal of the American Chemical Society
Volume141
Issue number17
DOIs
StatePublished - May 1 2019

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High resolution electron microscopy
High resolution transmission electron microscopy
Transmission Electron Microscopy
Electron Microscopy
Electron Energy-Loss Spectroscopy
Carbon
Diffraction
Nanostructures
Electron energy loss spectroscopy
Benzene
Solid state reactions
Nanostructured materials
Electron diffraction
Stoichiometry
Polymerization
Scattering
Electrons
Crystalline materials
Pressure
Defects

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

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abstract = "Carbon nanothreads are a new one-dimensional sp3-bonded nanomaterial of CH stoichiometry synthesized from benzene at high pressure and room temperature by slow solid-state polymerization. The resulting threads assume crystalline packing hundreds of micrometers across. We show high-resolution electron microscopy (HREM) images of hexagonal arrays of well-aligned thread columns that traverse the 80-100 nm thickness of the prepared sample. Diffuse scattering in electron diffraction reveals that nanothreads are packed with axial and/or azimuthal disregistry between them. Layer lines in diffraction from annealed nanothreads provide the first evidence of translational order along their length, indicating that this solid-state reaction proceeds with some regularity. HREM also reveals bends and defects in nanothread crystals that can contribute to the broadening of their diffraction spots, and electron energy-loss spectroscopy confirms them to be primarily sp3-hybridized, with less than 27{\%} sp2 carbon, most likely associated with partially saturated {"}degree-4{"} threads.",
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Local Structure and Bonding of Carbon Nanothreads Probed by High-Resolution Transmission Electron Microscopy. / Juhl, Stephen J.; Wang, Tao; Vermilyea, Brian; Li, Xiang; Crespi, Vincent Henry; Badding, John V.; Alem, Nasim.

In: Journal of the American Chemical Society, Vol. 141, No. 17, 01.05.2019, p. 6937-6945.

Research output: Contribution to journalArticle

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