Subnanometer vacancy defects introduced on graphene by oxygen gas.

@article{Yamada2014SubnanometerVD,
  title={Subnanometer vacancy defects introduced on graphene by oxygen gas.},
  author={Yasuhiro Yamada and Kazumasa Murota and Ryosuke Fujita and Jungpil Kim and Ayuko Watanabe and Masashi Nakamura and Satoshi Sato and Kenji Hata and Peter Ercius and Jim Ciston and Cheng Yu Song and Kwanpyo Kim and William Regan and Will Gannett and Alex Zettl},
  journal={Journal of the American Chemical Society},
  year={2014},
  volume={136 6},
  pages={
          2232-5
        }
}
The basal plane of graphene has been known to be less reactive than the edges, but some studies observed vacancies in the basal plane after reaction with oxygen gas. Observation of these vacancies has typically been limited to nanometer-scale resolution using microscopic techniques. This work demonstrates the introduction and observation of subnanometer vacancies in the basal plane of graphene by heat treatment in a flow of oxygen gas at low temperature such as 533 K or lower. High-resolution… Expand
Controlled generation of atomic vacancies in chemical vapor deposited graphene by microwave oxygen plasma
Abstract The introduction of atomic-scale defects in a controllable manner and the understanding of their effect on the characteristics of graphene are essential to develop many applications based onExpand
Precise control of defects in graphene using oxygen plasma
The authors report on a facile method for introducing defects in graphene in a controlled manner. Samples were mounted face down between supports, and exposed to oxygen plasma in a reactive ionExpand
OH molecule-involved formation of point defects in monolayer graphene.
TLDR
It is found that oxygen and hydrogen atoms can be involved in the formation of these point defects caused by the simultaneous detachment of oxygen-carbon atoms in graphene monolayers. Expand
Nanofluid lubrication and high pressure Raman studies of oxygen functionalized graphene nanosheets
Abstract Ultralow friction coefficient in reduced graphene oxide (rGO) nanofluid was observed at high pressure lubrication conditions. High pressure Raman spectroscopic studies of graphene oxide (GO)Expand
Divergent mechanisms for thermal reduction of graphene oxide and their highly different ion affinities
Abstract The significant effects of annealing atmosphere on the thermal reduction of graphene oxide (GO) under different atmospheres, air and nitrogen, have been investigated and their distinctExpand
Entropy of Nanostructures: Topological Effects on Schottky Vacancies Concentration in Graphenic Bidimensional HC(N) Lattices
Recent advances in graphene studies deal with the influence of structural defects on graphene chemical, electrical, magnetic and mechanical properties. Here the complex mechanisms leading to theExpand
Substrate and atmosphere influence on oxygen p-doped graphene
Abstract The mechanisms responsible for p-type doping of substrate supported monolayer graphene (Gr) by thermal treatments in oxygen ambient have been investigated by micro-Raman spectroscopy, atomicExpand
Facile thermal annealing of graphite oxide in air for graphene with a higher C/O ratio
Rapid thermal exfoliation/reduction of graphite oxide is a fast and easy method among the oxidation–reduction approaches for graphene synthesis. In this research, we firstly demonstrated thatExpand
4He/3He separation using oxygen-functionalized nanoporous graphene.
TLDR
It is found that the two quantum effects, zero-point energy and quantum tunneling, which act in opposite directions, show different levels of participation in each set of process conditions. Expand
Effect of air on oxygen p-doped graphene on SiO2
Stability in ambient air or in vacuum-controlled atmosphere of molecular oxygen-induced p-type doping of graphene monolayer on SiO2 substrate on Si is investigated by micro-Raman spectroscopy andExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 42 REFERENCES
Two-step mechanism for low-temperature oxidation of vacancies in graphene.
TLDR
The studies show that the partial pressure of oxygen is an important external parameter that affects the mechanisms of oxidation and that allows us to control the extent of etching. Expand
Atomic structure of reduced graphene oxide.
TLDR
The layers are found to comprise defect-free graphene areas with sizes of a few nanometers interspersed with defect areas dominated by clustered pentagons and heptagons, which makes all carbon atoms in these defective areas undetectable by spectroscopic techniques. Expand
Direct evidence for atomic defects in graphene layers
TLDR
Observations in situ of defect formation in single graphene layers by high-resolution TEM are reported and are expected to be of use when engineering the properties of carbon nanostructures for specific device applications. Expand
Oxygen migration on the graphene surface. 2. Thermochemistry of basal-plane diffusion (hopping)
Abstract Thermodynamic affinities, activation energies and diffusion coefficients for oxygen mobility on the graphene surface are calculated using density functional theory (DFT). We report andExpand
Magnetic properties of vacancies in graphene and single-walled carbon nanotubes
Spin-polarized density functional theory has been used to study the properties of vacancies in a graphene sheet and in single-walled carbon nanotubes (SWNTs). For graphene, we find that the vacanciesExpand
Probing the nature of defects in graphene by Raman spectroscopy.
TLDR
A detailed analysis of the Raman spectra of graphene containing different type of defects is presented, finding that the intensity ratio of the D and D' peak is maximum for sp(3)-defects, it decreases for vacancy-like defects, and it reaches a minimum for boundaries in graphite. Expand
Graphene oxidation: thickness-dependent etching and strong chemical doping.
TLDR
It is found that O 2 etching kinetics vary strongly with the number of graphene layers in the sample, and three-layer-thick samples show etching similar to bulk natural graphite. Expand
Initial Stages of Oxidation on Graphitic Surfaces: Photoemission Study and Density Functional Theory Calculations
The initial oxidation stages of perfect and defective graphitic surfaces exposed to atomic oxygen have been studied with a combined high-resolution photoemission spectroscopy (HR-PES) and densityExpand
Healing of structural defects in the topmost layer of graphite by chemical vapor deposition.
TLDR
In this respect, defects are undesirable, and the ability to “heal” them is important for generating carbon nanostructures with high electrical and thermal conductivities and, potentially, enhanced mechanical strength. Expand
Dual path mechanism in the thermal reduction of graphene oxide.
TLDR
A dual path mechanism in the thermal reduction of graphene oxide driven by the oxygen coverage is identified: at low surface density, the O atoms adsorbed as epoxy groups evolve as O(2) leaving the C network unmodified leaving theC network un modified. Expand
...
1
2
3
4
5
...