Journal ArticleDOI
Defect-like Structures of Graphene on Copper Foils for Strain Relief Investigated by High-Resolution Scanning Tunneling Microscopy
TLDR
This work indicates that graphene can be grown with a perfect continuity extending over both crystalline and noncrystalline regions, highly suggestive of weak graphene-substrate interactions.Abstract:
Understanding of the continuity and the microscopic structure of as-grown graphene on Cu foils through the chemical vapor deposition (CVD) method is of fundamental significance for optimizing the growth parameters toward high-quality graphene. Because of the corrugated nature of the Cu foil surface, few experimental efforts on this issue have been made so far. We present here a high-resolution scanning tunneling microscopy (STM) study of CVD graphene directly on Cu foils. Our work indicates that graphene can be grown with a perfect continuity extending over both crystalline and noncrystalline regions, highly suggestive of weak graphene–substrate interactions. Due to thermal expansion mismatch, defect-like wrinkles and ripples tend to evolve either along the boundaries of crystalline terraces or on noncrystalline areas for strain relief. Furthermore, the strain effect arising from the conforming of perfect two-dimensional graphene to the highly corrugated surface of Cu foils is found to induce local bondin...read more
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Journal ArticleDOI
Structure and Electronic Transport in Graphene Wrinkles
Wenjuan Zhu,Tony Low,Vasili Perebeinos,Ageeth A. Bol,Yu Zhu,Hugen Yan,Jerry Tersoff,Phaedon Avouris +7 more
TL;DR: Calculations of the energetics explain the morphological transition and indicate that the tall ripples are collapsed into narrow standing wrinkles by van der Waals forces, analogous to large-diameter nanotubes, consistent with transport simulations.
Journal ArticleDOI
Boosted Electrocatalytic N2 Reduction to NH3 by Defect-Rich MoS2 Nanoflower
Xianghong Li,Xianghong Li,Tingshuai Li,Yongjun Ma,Qin Wei,Weibin Qiu,Haoran Guo,Xifeng Shi,Peng Zhang,Abdullah M. Asiri,Liang Chen,Bo Tang,Xuping Sun +12 more
TL;DR: In this article, a defect-rich MoS2 nanoflowers was used for electrocatalytic N-2 reduction to NH3 with excellent selectivity, achieving a high Faradic efficiency of 8.34% and a high NH3 yield of 29.68 eV.
Journal ArticleDOI
Effects of Polycrystalline Cu Substrate on Graphene Growth by Chemical Vapor Deposition
TL;DR: The number of graphene defects and nucleation sites appears Cu facet invariant at growth temperatures above 900 °C, and it is determined that (111) containing facet produce pristine monolayer graphene with higher growth rate than (100) containing facets, especially Cu.
Journal ArticleDOI
Toward Single-Layer Uniform Hexagonal Boron Nitride–Graphene Patchworks with Zigzag Linking Edges
Yabo Gao,Yanfeng Zhang,Pengcheng Chen,Yuanchang Li,Mengxi Liu,Teng Gao,Donglin Ma,Yubin Chen,Zhihai Cheng,Xiaohui Qiu,Wenhui Duan,Zhongfan Liu +11 more
TL;DR: This work has successfully grown a perfect single-layer h-BN-graphene (BNC) patchwork on a selected Rh(111) substrate, via a two-step patching growth approach and found that zigzag linking edges were preferably formed, as demonstrated by atomic-scale scanning tunneling microscopy images and theoretically verified using density functional theory calculations.
Journal ArticleDOI
Selective metal deposition at graphene line defects by atomic layer deposition
Kwanpyo Kim,Kwanpyo Kim,Han-Bo-Ram Lee,Han-Bo-Ram Lee,Richard W. Johnson,Jukka T. Tanskanen,Jukka T. Tanskanen,Nan Liu,Myung-Gil Kim,Myung-Gil Kim,Changhyun Pang,Changhyun Pang,Chiyui Ahn,Stacey F. Bent,Zhenan Bao +14 more
TL;DR: The selective functionalization of graphene defect sites, together with the nanowire morphology of deposited Pt, yields a superior platform for sensing applications and high-performance hydrogen gas sensors at room temperature are demonstrated.
References
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TL;DR: Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena can now be mimicked and tested in table-top experiments.
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TL;DR: In this paper, the basic theoretical aspects of graphene, a one-atom-thick allotrope of carbon, with unusual two-dimensional Dirac-like electronic excitations, are discussed.
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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.
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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.