Journal ArticleDOI
Mechanical properties of suspended graphene sheets
TLDR
In this article, the Young's modulus of stacks of graphene sheets suspended over photolithographically defined trenches in silicon dioxide was measured using an atomic force microscope, with measured spring constants scaling as expected with the dimensions of the suspended section, ranging from 1to5N∕m.Abstract:
Using an atomic force microscope, we measured effective spring constants of stacks of graphene sheets (less than 5) suspended over photolithographically defined trenches in silicon dioxide. Measurements were made on layered graphene sheets of thicknesses between 2 and 8nm, with measured spring constants scaling as expected with the dimensions of the suspended section, ranging from 1to5N∕m. When our data are fitted to a model for doubly clamped beams under tension, we extract a Young’s modulus of 0.5TPa, compared to 1TPa for bulk graphite along the basal plane, and tensions on the order of 10−7N.read more
Citations
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Preparation and mechanical properties of alumina composites reinforced with nickel-coated graphene
TL;DR: In this article, the effects of the addition of coated graphene and coating thickness on mechanical properties were evaluated, such as relative density, hardness and fracture toughness, and significant improvement of the fracture toughness (60%) for the composites with 2-vol% Gn−Ni−P compared to reference sample was observed.
Journal ArticleDOI
The effects of vacancy defect on the fracture behaviors of zigzag graphene nanoribbons
TL;DR: In this paper, a comparison of the stress-strain relationship and the fracture behavior of pristine and defective graphene nanoribbons demonstrate that single vacancy defect has little influence on the elastic modulus and the ultimate strength of GNNs.
Journal ArticleDOI
Electrical Stress and Total Ionizing Dose Effects on ${\hbox {MoS}}_{2}$ Transistors
Cher Xuan Zhang,Akm Newaz,Bin Wang,En Xia Zhang,Guo Xing Duan,Daniel M. Fleetwood,Michael L. Alles,Ronald D. Schrimpf,Kirill I. Bolotin,Sokrates T. Pantelides +9 more
TL;DR: In this paper, back-gate MoS 2 transistors were evaluated for 10-keV x-ray irradiation and annealing responses for back-board transistors, and relative stability of device characteristics was observed for constant-voltage stress.
Journal ArticleDOI
In situ indentation behavior of bulk multi-layer graphene flakes with respect to orientation
TL;DR: In situ indentation is performed on bulk multi-layer graphene flakes (MLG) consolidated by spark plasma sintering to study the effect of orientation on the deformation behavior and associated energy dissipation capabilities of MLG.
Journal ArticleDOI
Highly uniform growth of monolayer graphene by chemical vapor deposition on Cu-Ag alloy catalysts.
Hae-A. Seul Shin,Jaechul Ryu,Jaechul Ryu,Jaechul Ryu,Sung-Pyo Cho,Eun-Kyu Lee,Seungmin Cho,Changgu Lee,Young-Chang Joo,Byung Hee Hong +9 more
TL;DR: Experimental analyses show that the plated Ag diffuses into Cu to form a uniform Cu-Ag alloy that suppresses the formation of multilayer nucleation and decreases the activation energy of precursor formation, leading to a lower synthesis temperature with enhanced monolayer coverage.
References
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Journal ArticleDOI
Two-dimensional gas of massless Dirac fermions in graphene
Kostya S. Novoselov,A. K. Geim,Sergey V. Morozov,Da Jiang,Mikhail I. Katsnelson,Irina V. Grigorieva,S. V. Dubonos,A. A. Firsov +7 more
TL;DR: This study reports an experimental study of a condensed-matter system (graphene, a single atomic layer of carbon) in which electron transport is essentially governed by Dirac's (relativistic) equation and reveals a variety of unusual phenomena that are characteristic of two-dimensional Dirac fermions.
Journal ArticleDOI
Raman spectrum of graphene and graphene layers.
Andrea C. Ferrari,Jannik C. Meyer,Vittorio Scardaci,Cinzia Casiraghi,Michele Lazzeri,Francesco Mauri,S. Piscanec,Da Jiang,K. S. Novoselov,S. Roth,A. K. Geim +10 more
TL;DR: This work shows that graphene's electronic structure is captured in its Raman spectrum that clearly evolves with the number of layers, and allows unambiguous, high-throughput, nondestructive identification of graphene layers, which is critically lacking in this emerging research area.
Journal ArticleDOI
Experimental observation of the quantum Hall effect and Berry's phase in graphene
TL;DR: In this paper, an experimental investigation of magneto-transport in a high-mobility single layer of Graphene is presented, where an unusual half-integer quantum Hall effect for both electron and hole carriers in graphene is observed.
Journal ArticleDOI
Two-dimensional atomic crystals
Kostya S. Novoselov,Da Jiang,Fred Schedin,Timothy J. Booth,V. V. Khotkevich,Sergey V. Morozov,Andre K. Geim +6 more
TL;DR: By using micromechanical cleavage, a variety of 2D crystals including single layers of boron nitride, graphite, several dichalcogenides, and complex oxides are prepared and studied.
Journal Article
Experimental Observation of Quantum Hall Effect and Berry's Phase in Graphene
TL;DR: An experimental investigation of magneto-transport in a high-mobility single layer of graphene observes an unusual half-integer quantum Hall effect for both electron and hole carriers in graphene.