3 research outputs found
Optical Properties of Graphene Nanoribbons Encapsulated in Single-Walled Carbon Nanotubes
We report the photoluminescence (PL) from graphene nanoribbons (GNRs) encapsulated in single-walled carbon nanotubes (SWCNTs). New PL spectral features originating from GNRs have been detected in the visible spectral range. PL peaks from GNRs have resonant character, and their positions depend on the ribbon geometrical structure in accordance with the theoretical predictions. GNRs were synthesized using confined polymerization and fusion of coronene molecules. GNR@SWCNTs material demonstrates a bright photoluminescence both in infrared (IR) and visible regions. The photoluminescence excitation mapping in the near-IR spectral range has revealed the geometry-dependent shifts of the SWCNT peaks (up to 11 meV in excitation and emission) after the process of polymerization of coronene molecules inside the nanotubes. This behavior has been attributed to the strain of SWCNTs induced by insertion of the coronene molecules
Growth Mechanism of Single-Walled Carbon Nanotubes on Iron–Copper Catalyst and Chirality Studies by Electron Diffraction
Chiralities of single-walled carbon nanotubes grown on
an atomic
layer deposition prepared bimetallic FeCu/MgO catalyst were evaluated
quantitatively using nanobeam electron diffraction. The results reveal
that the growth yields nearly 90% semiconducting tubes, 45% of which
are of the (6,5) type. The growth mechanisms as well as the roles
of different components in the catalyst were studied in situ using
environmental transmission electron microscopy and infrared spectroscopy.
On the basis of the understanding of carbon nanotube growth mechanisms,
an MgO-supported FeCu catalyst was prepared by impregnation, showing
similar catalytic performance as the atomic layer deposition-prepared
catalyst, yielding single-walled carbon nanotubes with a similar narrow
chirality distribution
Growth Mechanism of Single-Walled Carbon Nanotubes on Iron–Copper Catalyst and Chirality Studies by Electron Diffraction
Chiralities of single-walled carbon nanotubes grown on
an atomic
layer deposition prepared bimetallic FeCu/MgO catalyst were evaluated
quantitatively using nanobeam electron diffraction. The results reveal
that the growth yields nearly 90% semiconducting tubes, 45% of which
are of the (6,5) type. The growth mechanisms as well as the roles
of different components in the catalyst were studied in situ using
environmental transmission electron microscopy and infrared spectroscopy.
On the basis of the understanding of carbon nanotube growth mechanisms,
an MgO-supported FeCu catalyst was prepared by impregnation, showing
similar catalytic performance as the atomic layer deposition-prepared
catalyst, yielding single-walled carbon nanotubes with a similar narrow
chirality distribution