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Damage Mechanics of Graphene Nanorib...

Zhang, Ji .

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Damage Mechanics of Graphene Nanoribbons (GNRs) under Electric Current Induced Wind Forces.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Damage Mechanics of Graphene Nanoribbons (GNRs) under Electric Current Induced Wind Forces./
作者:	Zhang, Ji .
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
面頁冊數:	189 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-10, Section: B.
Contained By:	Dissertations Abstracts International81-10B.
標題:	Civil engineering. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27738239
ISBN:	9781658422055

Damage Mechanics of Graphene Nanoribbons (GNRs) under Electric Current Induced Wind Forces.
Zhang, Ji .

Damage Mechanics of Graphene Nanoribbons (GNRs) under Electric Current Induced Wind Forces. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 189 p.

Source: Dissertations Abstracts International, Volume: 81-10, Section: B.

Thesis (Ph.D.)--State University of New York at Buffalo, 2020.

This item must not be sold to any third party vendors.

Graphene is single layer of carbon atoms that are covalently bonded via sp2 bonds. Since its discovery in 2004 by the famous "scotch tape method", graphene has attracted lots of attention during the last decade due to its excellent mechanical, thermal and electrical properties. Graphene is promising to replace Silicon in the next generation semiconducting materials not only because of its excellent material properties, but also because of its planar geometry make it more convenient to be integrated into electronic devices during mass production using traditional top-down complementary metal oxide semiconductor (GMOS) process with little variant.Introducing energy band gap has been a core topic of using graphene as semiconducting material in electronics as graphene is intrinsic gapless material. Fabrication graphene into strip of sub-10 nm wide graphene nanoribbons (GNRs) is the most common method of introducing energy band gap into this material. In order to investigate the reliability of GNR-based electronics, a thorough understanding of the material properties including mechanical strength, fracture behavior, and current density capacities of GNRs is essential.Due to the extreme difficulty in conducting experiments in an atomic precise manner, Molecular Dynamics (MD) simulations have been used extensively for studying the mechanical properties of GNRs. In this dissertation, MD simulations has been performed to GNRs considering the effect of dimensions, chirality, and defects. Stress-strain curves and fracture strengths of the GNRs were compared to study the effect of vacancy defects on their mechanical properties. Fabricating graphene into graphene nanomeshes (GNMs) by introducing periodic Nano size hole array into graphene is another method of introducing energy band gap into graphene. The mechanical properties of GNMs have been studied using MD simulations. GNMs with different hole geometries and sizes are simulated. The fracture strength of the GNMs are reported and the failure mechanisms of GNMs with different hole geometries are reported with the aid of stress contour over GNMs from MD simulations.The interfacial properties such as frictional coefficient between graphene and device substrates are fundamental problems in the application of graphene in electronics. Using MD simulations, a comprehensive evaluation of anisotropic frictional behavior of graphene nanoflake-diamond interface has been studied by considering the effects of chirality and temperature. The friction forces exhibited periodic stick-slip motion with respect to the sliding distance and the friction coefficients are reported.Electrical wind force is the most common cause of failure of electronics. In this study the electric current-induced wind forces on a unit lattice of a 10-dimer zigzag graphene nanoribbon (ZGNR) are calculated under different magnitudes of electric field and temperatures. Wind forces are calculated using a semi-classical method where quantum mechanics is integrated into Ensemble Monte Carlo (EMC) simulations by considering energy and momentum conservation in both transverse and longitudinal directions of GNR during the electron-phonon scattering process. Results show that under the same electric field, Joule heating power in 10-dimer ZGNR is around 3 magnitudes higher than metallic single-walled carbon nanotubes and the wind forces are 1 magnitude higher.

ISBN: 9781658422055Subjects--Topical Terms:

860360
Civil engineering.
Subjects--Index Terms:

Damage mechanics

Damage Mechanics of Graphene Nanoribbons (GNRs) under Electric Current Induced Wind Forces.
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506 $a This item must not be sold to any third party vendors.
520 $a Graphene is single layer of carbon atoms that are covalently bonded via sp2 bonds. Since its discovery in 2004 by the famous "scotch tape method", graphene has attracted lots of attention during the last decade due to its excellent mechanical, thermal and electrical properties. Graphene is promising to replace Silicon in the next generation semiconducting materials not only because of its excellent material properties, but also because of its planar geometry make it more convenient to be integrated into electronic devices during mass production using traditional top-down complementary metal oxide semiconductor (GMOS) process with little variant.Introducing energy band gap has been a core topic of using graphene as semiconducting material in electronics as graphene is intrinsic gapless material. Fabrication graphene into strip of sub-10 nm wide graphene nanoribbons (GNRs) is the most common method of introducing energy band gap into this material. In order to investigate the reliability of GNR-based electronics, a thorough understanding of the material properties including mechanical strength, fracture behavior, and current density capacities of GNRs is essential.Due to the extreme difficulty in conducting experiments in an atomic precise manner, Molecular Dynamics (MD) simulations have been used extensively for studying the mechanical properties of GNRs. In this dissertation, MD simulations has been performed to GNRs considering the effect of dimensions, chirality, and defects. Stress-strain curves and fracture strengths of the GNRs were compared to study the effect of vacancy defects on their mechanical properties. Fabricating graphene into graphene nanomeshes (GNMs) by introducing periodic Nano size hole array into graphene is another method of introducing energy band gap into graphene. The mechanical properties of GNMs have been studied using MD simulations. GNMs with different hole geometries and sizes are simulated. The fracture strength of the GNMs are reported and the failure mechanisms of GNMs with different hole geometries are reported with the aid of stress contour over GNMs from MD simulations.The interfacial properties such as frictional coefficient between graphene and device substrates are fundamental problems in the application of graphene in electronics. Using MD simulations, a comprehensive evaluation of anisotropic frictional behavior of graphene nanoflake-diamond interface has been studied by considering the effects of chirality and temperature. The friction forces exhibited periodic stick-slip motion with respect to the sliding distance and the friction coefficients are reported.Electrical wind force is the most common cause of failure of electronics. In this study the electric current-induced wind forces on a unit lattice of a 10-dimer zigzag graphene nanoribbon (ZGNR) are calculated under different magnitudes of electric field and temperatures. Wind forces are calculated using a semi-classical method where quantum mechanics is integrated into Ensemble Monte Carlo (EMC) simulations by considering energy and momentum conservation in both transverse and longitudinal directions of GNR during the electron-phonon scattering process. Results show that under the same electric field, Joule heating power in 10-dimer ZGNR is around 3 magnitudes higher than metallic single-walled carbon nanotubes and the wind forces are 1 magnitude higher.
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