The Experts below are selected from a list of 23823 Experts worldwide ranked by ideXlab platform
Barry L. Farmer - One of the best experts on this subject based on the ideXlab platform.
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modeling of Thermal Transport in pillared graphene architectures
ACS Nano, 2010Co-Authors: Vikas Varshney, George Froudakis, Suparva S. Patnaik, Barry L. FarmerAbstract:Carbon nanotubes (CNT) and graphene are considered as potential future candidates for many nano/microscale integrated devices due to their superior Thermal properties. Both systems, however, exhibit significant anisotropy in their Thermal conduction, limiting their performance as three-dimensional Thermal Transport materials. From Thermal management perspective, one way to tailor this anisotropy is to consider designing alternative carbon-based architectures. This paper investigates the Thermal Transport in one such novel architecture—a pillared-graphene (PG) network nanostructure which combines graphene sheets and carbon nanotubes to create a three-dimensional network. Nonequilibrium molecular dynamics simulations have been carried out using the AIREBO potential to calculate the Thermal conductivity of pillared-graphene structures along parallel (in-plane) as well as perpendicular (out-of-plane) directions with respect to the graphene plane. The resulting Thermal conductivity values for PG systems are di...
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Modeling of Thermal Transport in pillared-graphene architectures
ACS Nano, 2010Co-Authors: Vikas Varshney, George Froudakis, Suparva S. Patnaik, Ajit K. Roy, Barry L. FarmerAbstract:Carbon nanotubes (CNT) and graphene are considered as potential future candidates for many nano/microscale integrated devices due to their superior Thermal properties. Both systems, however, exhibit significant anisotropy in their Thermal conduction, limiting their performance as three-dimensional Thermal Transport materials. From Thermal management perspective, one way to tailor this anisotropy is to consider designing alternative carbon-based architectures. This paper investigates the Thermal Transport in one such novel architecture-a pillared-graphene (PG) network nanostructure which combines graphene sheets and carbon nanotubes to create a three-dimensional network. Nonequilibrium molecular dynamics simulations have been carried out using the AIREBO potential to calculate the Thermal conductivity of pillared-graphene structures along parallel (in-plane) as well as perpendicular (out-of-plane) directions with respect to the graphene plane. The resulting Thermal conductivity values for PG systems are discussed and compared with simulated values for pure CNT and graphite. Our results show that in these PG structures, the Thermal Transport is governed by the minimum interpillar distance and the CNT-pillar length. This is primarily attributed to scattering of phonons occurring at the CNT-graphene junctions in these nanostructures. We foresee that such architecture could potentially be used as a template for designing future structurally stable microscale systems with tailorable in-plane and out-of-plane Thermal Transport.
Vikas Varshney - One of the best experts on this subject based on the ideXlab platform.
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modeling of Thermal Transport in pillared graphene architectures
ACS Nano, 2010Co-Authors: Vikas Varshney, George Froudakis, Suparva S. Patnaik, Barry L. FarmerAbstract:Carbon nanotubes (CNT) and graphene are considered as potential future candidates for many nano/microscale integrated devices due to their superior Thermal properties. Both systems, however, exhibit significant anisotropy in their Thermal conduction, limiting their performance as three-dimensional Thermal Transport materials. From Thermal management perspective, one way to tailor this anisotropy is to consider designing alternative carbon-based architectures. This paper investigates the Thermal Transport in one such novel architecture—a pillared-graphene (PG) network nanostructure which combines graphene sheets and carbon nanotubes to create a three-dimensional network. Nonequilibrium molecular dynamics simulations have been carried out using the AIREBO potential to calculate the Thermal conductivity of pillared-graphene structures along parallel (in-plane) as well as perpendicular (out-of-plane) directions with respect to the graphene plane. The resulting Thermal conductivity values for PG systems are di...
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Modeling of Thermal Transport in pillared-graphene architectures
ACS Nano, 2010Co-Authors: Vikas Varshney, George Froudakis, Suparva S. Patnaik, Ajit K. Roy, Barry L. FarmerAbstract:Carbon nanotubes (CNT) and graphene are considered as potential future candidates for many nano/microscale integrated devices due to their superior Thermal properties. Both systems, however, exhibit significant anisotropy in their Thermal conduction, limiting their performance as three-dimensional Thermal Transport materials. From Thermal management perspective, one way to tailor this anisotropy is to consider designing alternative carbon-based architectures. This paper investigates the Thermal Transport in one such novel architecture-a pillared-graphene (PG) network nanostructure which combines graphene sheets and carbon nanotubes to create a three-dimensional network. Nonequilibrium molecular dynamics simulations have been carried out using the AIREBO potential to calculate the Thermal conductivity of pillared-graphene structures along parallel (in-plane) as well as perpendicular (out-of-plane) directions with respect to the graphene plane. The resulting Thermal conductivity values for PG systems are discussed and compared with simulated values for pure CNT and graphite. Our results show that in these PG structures, the Thermal Transport is governed by the minimum interpillar distance and the CNT-pillar length. This is primarily attributed to scattering of phonons occurring at the CNT-graphene junctions in these nanostructures. We foresee that such architecture could potentially be used as a template for designing future structurally stable microscale systems with tailorable in-plane and out-of-plane Thermal Transport.
Jonathan A. Malen - One of the best experts on this subject based on the ideXlab platform.
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Nondiffusive Thermal Transport Increases Temperature Rise in RRAM Filaments
IEEE Electron Device Letters, 2016Co-Authors: Keith T. Regner, Jonathan A. MalenAbstract:Thermal Transport in resistive random-access memory (RRAM) is modeled in the set state, where the conductive filament (CF) is approximated by an infinitely long cylinder embedded in crystalline rutile TiO2, a prototypical RRAM material. Determination of the phonon mean free path (MFP) spectrum in TiO2 shows that MFPs are similar to the CF radius, indicating that Thermal Transport is nondiffusive. We develop an analytical solution to the Boltzmann Transport equation (BTE) to model the nondiffusive Thermal Transport in TiO2 and find that the surface temperature rise of the CF predicted by the BTE is larger than that predicted by the heat diffusion equation (e.g., $4\times $ larger for a 1 nm CF radius in a device operating at a temperature of 300 K). We propose a suppressed, effective TiO2 Thermal conductivity to more accurately predict the CF temperature rise with the heat diffusion equation.
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Nondiffusive Thermal Transport Increases Temperature Rise in RRAM Filaments
IEEE Electron Device Letters, 2016Co-Authors: Keith T. Regner, Jonathan A. MalenAbstract:Thermal Transport in resistive random-access memory (RRAM) is modeled in the set state, where the conductive filament (CF) is approximated by an infinitely long cylinder embedded in crystalline rutile TiO2, a prototypical RRAM material. Determination of the phonon mean free path (MFP) spectrum in TiO2 shows that MFPs are similar to the CF radius, indicating that Thermal Transport is nondiffusive. We develop an analytical solution to the Boltzmann Transport equation (BTE) to model the nondiffusive Thermal Transport in TiO2 and find that the surface temperature rise of the CF predicted by the BTE is larger than that predicted by the heat diffusion equation (e.g., 4x larger for a 1 nm CF radius in a device operating at a temperature of 300 K). We propose a suppressed, effective TiO2 Thermal conductivity to more accurately predict the CF temperature rise with the heat diffusion equation.
George Froudakis - One of the best experts on this subject based on the ideXlab platform.
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modeling of Thermal Transport in pillared graphene architectures
ACS Nano, 2010Co-Authors: Vikas Varshney, George Froudakis, Suparva S. Patnaik, Barry L. FarmerAbstract:Carbon nanotubes (CNT) and graphene are considered as potential future candidates for many nano/microscale integrated devices due to their superior Thermal properties. Both systems, however, exhibit significant anisotropy in their Thermal conduction, limiting their performance as three-dimensional Thermal Transport materials. From Thermal management perspective, one way to tailor this anisotropy is to consider designing alternative carbon-based architectures. This paper investigates the Thermal Transport in one such novel architecture—a pillared-graphene (PG) network nanostructure which combines graphene sheets and carbon nanotubes to create a three-dimensional network. Nonequilibrium molecular dynamics simulations have been carried out using the AIREBO potential to calculate the Thermal conductivity of pillared-graphene structures along parallel (in-plane) as well as perpendicular (out-of-plane) directions with respect to the graphene plane. The resulting Thermal conductivity values for PG systems are di...
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Modeling of Thermal Transport in pillared-graphene architectures
ACS Nano, 2010Co-Authors: Vikas Varshney, George Froudakis, Suparva S. Patnaik, Ajit K. Roy, Barry L. FarmerAbstract:Carbon nanotubes (CNT) and graphene are considered as potential future candidates for many nano/microscale integrated devices due to their superior Thermal properties. Both systems, however, exhibit significant anisotropy in their Thermal conduction, limiting their performance as three-dimensional Thermal Transport materials. From Thermal management perspective, one way to tailor this anisotropy is to consider designing alternative carbon-based architectures. This paper investigates the Thermal Transport in one such novel architecture-a pillared-graphene (PG) network nanostructure which combines graphene sheets and carbon nanotubes to create a three-dimensional network. Nonequilibrium molecular dynamics simulations have been carried out using the AIREBO potential to calculate the Thermal conductivity of pillared-graphene structures along parallel (in-plane) as well as perpendicular (out-of-plane) directions with respect to the graphene plane. The resulting Thermal conductivity values for PG systems are discussed and compared with simulated values for pure CNT and graphite. Our results show that in these PG structures, the Thermal Transport is governed by the minimum interpillar distance and the CNT-pillar length. This is primarily attributed to scattering of phonons occurring at the CNT-graphene junctions in these nanostructures. We foresee that such architecture could potentially be used as a template for designing future structurally stable microscale systems with tailorable in-plane and out-of-plane Thermal Transport.
Suparva S. Patnaik - One of the best experts on this subject based on the ideXlab platform.
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modeling of Thermal Transport in pillared graphene architectures
ACS Nano, 2010Co-Authors: Vikas Varshney, George Froudakis, Suparva S. Patnaik, Barry L. FarmerAbstract:Carbon nanotubes (CNT) and graphene are considered as potential future candidates for many nano/microscale integrated devices due to their superior Thermal properties. Both systems, however, exhibit significant anisotropy in their Thermal conduction, limiting their performance as three-dimensional Thermal Transport materials. From Thermal management perspective, one way to tailor this anisotropy is to consider designing alternative carbon-based architectures. This paper investigates the Thermal Transport in one such novel architecture—a pillared-graphene (PG) network nanostructure which combines graphene sheets and carbon nanotubes to create a three-dimensional network. Nonequilibrium molecular dynamics simulations have been carried out using the AIREBO potential to calculate the Thermal conductivity of pillared-graphene structures along parallel (in-plane) as well as perpendicular (out-of-plane) directions with respect to the graphene plane. The resulting Thermal conductivity values for PG systems are di...
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Modeling of Thermal Transport in pillared-graphene architectures
ACS Nano, 2010Co-Authors: Vikas Varshney, George Froudakis, Suparva S. Patnaik, Ajit K. Roy, Barry L. FarmerAbstract:Carbon nanotubes (CNT) and graphene are considered as potential future candidates for many nano/microscale integrated devices due to their superior Thermal properties. Both systems, however, exhibit significant anisotropy in their Thermal conduction, limiting their performance as three-dimensional Thermal Transport materials. From Thermal management perspective, one way to tailor this anisotropy is to consider designing alternative carbon-based architectures. This paper investigates the Thermal Transport in one such novel architecture-a pillared-graphene (PG) network nanostructure which combines graphene sheets and carbon nanotubes to create a three-dimensional network. Nonequilibrium molecular dynamics simulations have been carried out using the AIREBO potential to calculate the Thermal conductivity of pillared-graphene structures along parallel (in-plane) as well as perpendicular (out-of-plane) directions with respect to the graphene plane. The resulting Thermal conductivity values for PG systems are discussed and compared with simulated values for pure CNT and graphite. Our results show that in these PG structures, the Thermal Transport is governed by the minimum interpillar distance and the CNT-pillar length. This is primarily attributed to scattering of phonons occurring at the CNT-graphene junctions in these nanostructures. We foresee that such architecture could potentially be used as a template for designing future structurally stable microscale systems with tailorable in-plane and out-of-plane Thermal Transport.
