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
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Nonlinear mechanics of single-atomic-layer graphene sheets
TL;DR: In this article, a theoretical framework of nonlinear continuum mechanics is developed for graphene under both in-plane and bending deformation, and it is found that graphene becomes highly nonlinear and anisotropic under finite-strain uniaxial stretch and coupling between stretch and shear occurs except for stretching in the zigzag and armchair directions.
Journal ArticleDOI
Mechanical and Electrical Anisotropy of Few-Layer Black Phosphorus
Jin Tao,Wanfu Shen,Sen Wu,Lu Liu,Zhihong Feng,Chao Wang,Chunguang Hu,Pei Yao,Hao Zhang,Wei Pang,Xuexin Duan,Jing Liu,Chongwu Zhou,Daihua Zhang +13 more
TL;DR: This work combined reflection difference microscopy, electron transport measurements, and atomic force microscopy to characterize the mechanical and electrical anisotropy of few-layer black phosphorus, and suggested an effective characterization means for future studies on black phosphorus and anisotropic two-dimensional nanomaterials in general.
Journal ArticleDOI
A tough graphene nanosheet/hydroxyapatite composite with improved in vitro biocompatibility
TL;DR: In this article, a 1.0 wt.% graphene/hydroxyapatite (HA) composite was synthesized using spark plasma sintering (SPS) for loadbearing orthopedic implant.
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Graphene Nanomesh As Highly Sensitive Chemiresistor Gas Sensor
TL;DR: These demonstrated studies on controlling the neck width of the nanomesh would lead to further improvement of graphene-based transistors and sensors.
Journal ArticleDOI
Graphene and its composites with nanoparticles for electrochemical energy applications
TL;DR: In this paper, a review summarizes the recent developments in chemistry, materials and energy applications of graphene, doped graphene and their composites with nanoparticles (NPs) and highlights the new chemistry used to synthesize high quality graphene.
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.