Actuation of a suspended nano-graphene sheet by impact with an argon cluster.

Graduate School of Engineering, University of Hyogo, 2167, Shosha, Himeji, Hyogo 671-2280, Japan.
Nanotechnology (Impact Factor: 3.67). 12/2008; 19(50):505501. DOI: 10.1088/0957-4484/19/50/505501
Source: PubMed

ABSTRACT Using a molecular dynamics simulation, we examine the actuation of nanodrums consisting of a single graphene sheet. The membrane of the nanodrum, which contains 190 carbon atoms, is bent by collision with a cluster consisting of 10 argon atoms. The choice of an appropriate cluster velocity enables nanometre deformation of the membrane in sub-picosecond time without rupturing the graphene sheet. Theoretical results predict that, if an adsorbed molecule exists on the graphene sheet, the quick deformation due to the impact with the cluster can break the weak bonding between the adsorbed molecule and the graphene sheet and release the molecule from the surface; this suggests that this system has attractive potential applications for purposes of molecular ejection.

  • [Show abstract] [Hide abstract]
    ABSTRACT: Using non-equilibrium molecular dynamics method, we study the self-healing behavior of graphene after bombarded by fullerene (C60) through controlling the environmental temperature and the incident velocity of C60. The self-healing probability depends on the size of graphene, the velocity of fullerene (C60), and the temperature of heat baths. It is suggested that the self-healing in damaged graphene originates from thermal fluctuation. Our results can offer additional insights for further understanding self-healing mechanisms and bombardment phenomena in low dimensional materials. Additionally, controlling the bombardment between the graphene and the fullerene (C60) may also lead to some potential applications in the surface cleaning of graphene and the production of nanopore.
    Applied Physics Letters 06/2014; 104(26):261907-261907-5. DOI:10.1063/1.4886580 · 3.52 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The method of molecular dynamics has been used to study the bombardment of a copper film on graphene by Ar13 clusters with a kinetic energy of 20 eV and incident angles θ = 75°, 60° and 45°. The complete removal of copper from the graphene sheet was achieved only at the angle θ= 45°. In this case, the horizontal and vertical components of the self-diffusion coefficient of copper in the film have higher values in the course of the entire bombardment. The mobility of carbon atoms and the stresses in the graphene sheet only weakly depend on the angle of incidence of clusters. The roughness of the surface of the graphene sheet subject to cleaning increases substantially only at the final stage of cleaning.
    The Physics of Metals and Metallography 07/2014; 115(7):697-704. DOI:10.1134/S0031918X14070023 · 0.61 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: RATIONALECollisions of clusters with solids have become important, especially in the fields of thin film growth or surface processing such as etching or topography smoothing. However, it is not clear how much of the theory or model used in macroscopic collisions is appropriate for the consideration of microscopic collisions.METHODS We considered a cluster ion consisting of thousands of argon atoms as a continuum and examined the possibility that classical mechanics could analyze its collision with metals. A mass spectrometric analysis of the dissociated ions of argon cluster ions (Ar+1500) in collision with five different metals was performed.RESULTSIn the mass spectra at an incident kinetic energy per atom of less than 10 eV, no monatomic argon ions (Ar+) were observed regardless of the prominence of Ar2+ or Ar3+. The branching ratio for the ion yield Ar2+/∑Arn+ (n ≥ 2), representing the dissociation rate, was found to be significantly different for each metal. The relationship between the branching ratio and the impulsive stress caused by the collision of the cluster ion with metal was investigated. The impulsive stress was calculated based on the Young's modulus and density of the clusters and metal, under the assumption that the collision was initially elastic. As a result, the magnitude correlation in the branching ratio corresponded well with that in the impulsive stress.CONCLUSIONS This result is important in that it indicates that collision of nano-sized clusters with solids at low energies can be modeled using elastic theory. Furthermore, the result suggests a new method for evaluating a physical property of a material such as its Young's modulus. Copyright © 2014 John Wiley & Sons, Ltd.
    Rapid Communications in Mass Spectrometry 10/2014; 28(19). DOI:10.1002/rcm.7004 · 2.64 Impact Factor

Full-text (2 Sources)

Available from
May 22, 2014