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Ultrafast nano-oscillators based on interlayer-bridged carbon nanoscrolls.

Zhang Z, Li T - Nanoscale Res Lett (2011)

Bottom Line: We demonstrate an effective strategy to reduce the dissipation of the CNS-based nano-oscillator by covalently bridging the carbon layers in the CNS.We further demonstrate that such a CNS-based nano-oscillator can be excited and driven by an external AC electric field, and oscillate at more than 100 GHz.The CNS-based nano-oscillators not only offer a feasible pathway toward ultrafast nano-devices but also hold promise to enable nanoscale energy transduction, harnessing, and storage (e.g., from electric to mechanical).

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA. LiT@umd.edu.

ABSTRACT
We demonstrate a viable approach to fabricating ultrafast axial nano-oscillators based on carbon nanoscrolls (CNSs) using molecular dynamics simulations. Initiated by a single-walled carbon nanotube (CNT), a monolayer graphene can continuously scroll into a CNS with the CNT housed inside. The CNT inside the CNS can oscillate along axial direction at a natural frequency of tens of gigahertz. We demonstrate an effective strategy to reduce the dissipation of the CNS-based nano-oscillator by covalently bridging the carbon layers in the CNS. We further demonstrate that such a CNS-based nano-oscillator can be excited and driven by an external AC electric field, and oscillate at more than 100 GHz. The CNS-based nano-oscillators not only offer a feasible pathway toward ultrafast nano-devices but also hold promise to enable nanoscale energy transduction, harnessing, and storage (e.g., from electric to mechanical).

No MeSH data available.


Related in: MedlinePlus

CNT-initiated scrolling of graphene into a CNS. (a-d) Snapshots of the graphene scrolling into a CNS initiated by a (10, 10) SWCNT, before equilibration, at 10, 22, and 76 ps, respectively. (e) The variation in the total potential energy of the system as a function of simulation time.
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Figure 2: CNT-initiated scrolling of graphene into a CNS. (a-d) Snapshots of the graphene scrolling into a CNS initiated by a (10, 10) SWCNT, before equilibration, at 10, 22, and 76 ps, respectively. (e) The variation in the total potential energy of the system as a function of simulation time.

Mentions: The CNS-based axial nano-oscillator depicted in Figure 1b was formed using a 10-nm-long (10, 10) single-walled CNT (SWCNT) to initiate the scrolling of a 10 nm by 30 nm graphene along its long (armchair) edge. The formation of the CNS/CNT nanostructure is similar to that described in Ref. [21]. As shown in Figure 2a, the graphene is supported by a SiO2 substrate, with a (10, 10) single wall CNT placed along the left edge of the graphene. The substrate is 34 nm long, 14 nm wide, and 1 nm thick. In the MD simulations, the C-C bonds in the CNT and CNS are described by the second-generation Brenner potential [23], which allows for C-C covalent bond forming and breaking. The non-bonded C-C interaction is described by a Lennard-Jones pair potential [24]. The graphene-substrate interaction is considered in the same way as in Ref. [21]. The MD simulations are carried out using LAMMPS [25] with canonical ensemble at 500 K and with time step of 1 fs.


Ultrafast nano-oscillators based on interlayer-bridged carbon nanoscrolls.

Zhang Z, Li T - Nanoscale Res Lett (2011)

CNT-initiated scrolling of graphene into a CNS. (a-d) Snapshots of the graphene scrolling into a CNS initiated by a (10, 10) SWCNT, before equilibration, at 10, 22, and 76 ps, respectively. (e) The variation in the total potential energy of the system as a function of simulation time.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211983&req=5

Figure 2: CNT-initiated scrolling of graphene into a CNS. (a-d) Snapshots of the graphene scrolling into a CNS initiated by a (10, 10) SWCNT, before equilibration, at 10, 22, and 76 ps, respectively. (e) The variation in the total potential energy of the system as a function of simulation time.
Mentions: The CNS-based axial nano-oscillator depicted in Figure 1b was formed using a 10-nm-long (10, 10) single-walled CNT (SWCNT) to initiate the scrolling of a 10 nm by 30 nm graphene along its long (armchair) edge. The formation of the CNS/CNT nanostructure is similar to that described in Ref. [21]. As shown in Figure 2a, the graphene is supported by a SiO2 substrate, with a (10, 10) single wall CNT placed along the left edge of the graphene. The substrate is 34 nm long, 14 nm wide, and 1 nm thick. In the MD simulations, the C-C bonds in the CNT and CNS are described by the second-generation Brenner potential [23], which allows for C-C covalent bond forming and breaking. The non-bonded C-C interaction is described by a Lennard-Jones pair potential [24]. The graphene-substrate interaction is considered in the same way as in Ref. [21]. The MD simulations are carried out using LAMMPS [25] with canonical ensemble at 500 K and with time step of 1 fs.

Bottom Line: We demonstrate an effective strategy to reduce the dissipation of the CNS-based nano-oscillator by covalently bridging the carbon layers in the CNS.We further demonstrate that such a CNS-based nano-oscillator can be excited and driven by an external AC electric field, and oscillate at more than 100 GHz.The CNS-based nano-oscillators not only offer a feasible pathway toward ultrafast nano-devices but also hold promise to enable nanoscale energy transduction, harnessing, and storage (e.g., from electric to mechanical).

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA. LiT@umd.edu.

ABSTRACT
We demonstrate a viable approach to fabricating ultrafast axial nano-oscillators based on carbon nanoscrolls (CNSs) using molecular dynamics simulations. Initiated by a single-walled carbon nanotube (CNT), a monolayer graphene can continuously scroll into a CNS with the CNT housed inside. The CNT inside the CNS can oscillate along axial direction at a natural frequency of tens of gigahertz. We demonstrate an effective strategy to reduce the dissipation of the CNS-based nano-oscillator by covalently bridging the carbon layers in the CNS. We further demonstrate that such a CNS-based nano-oscillator can be excited and driven by an external AC electric field, and oscillate at more than 100 GHz. The CNS-based nano-oscillators not only offer a feasible pathway toward ultrafast nano-devices but also hold promise to enable nanoscale energy transduction, harnessing, and storage (e.g., from electric to mechanical).

No MeSH data available.


Related in: MedlinePlus