scholarly journals Spontaneous edge-defect formation and defect-induced conductance suppression in graphene nanoribbons

2010 ◽  
Vol 82 (11) ◽  
Author(s):  
Jia Li ◽  
Zuanyi Li ◽  
Gang Zhou ◽  
Zhirong Liu ◽  
Jian Wu ◽  
...  
Keyword(s):  
Defect Formation ◽  
Graphene Nanoribbons ◽  
Edge Defect

Finite Element and Experimental Analysis of Edge Defects Formation during Orthogonal Cutting of SiCp/Al Composites

2012 ◽  
Vol 500 ◽  
pp. 146-151 ◽  
Author(s):  
Ning Hou ◽  
Li Zhou ◽  
Shu Tao Huang ◽  
Li Fu Xu
Keyword(s):  
Finite Element ◽  
Chip Formation ◽  
Defect Formation ◽  
Orthogonal Cutting ◽  
Cutting Speed ◽  
Rake Angle ◽  
Critical Transition ◽  
Cutting Depth ◽  
Edge Defect ◽  
Edge Defects

In this paper, a finite element method was used to dynamically simulate the process of the edge defects formation during orthogonal cutting SiCp/Al composites. The influence of the cutting speed, cutting depth and rake angle of the PCD insert on the size of the edge defects have been investigated by using scanning electron. According to the simulated results, it can be provided that the cutting layer material has an effect on transfer stress and hinder the chip formation in the critical transition stage, and the critical transition point and distance are defined in this stage. The negative shear phenomenon is found when the chip transit to the edge defects in the flexure deformation stage, so the process of the chip formation is the basis of the edge defects formation. In addition, the relationship between the nucleation and propagation direction of the crack and the variation of the edge defect shape on the workpiece was investigated by theory, and it found that the negative shear angle formation is the primary cause of the edge defect formation. A mixed mode crack is found in the crack propagation stage. The sizes of edge defects were measured by the experiment and simulation, and the edge defect size decrease with the increasing of tool rake angle, while increase with increasing cutting depth and cutting speed.

Ultra-low-edge-defect graphene nanoribbons patterned by neutral beam

Carbon ◽  
2013 ◽  
Vol 61 ◽  
pp. 229-235 ◽  
Author(s):  
Chi-Hsien Huang ◽  
Ching-Yuan Su ◽  
Takeru Okada ◽  
Lain-Jong Li ◽  
Kuan-I Ho ◽  
...  
Keyword(s):  
Graphene Nanoribbons ◽  
Neutral Beam ◽  
Edge Defect

Effect of Oxide on Trench Edge Defect Formation in Ion-Implanted Silicon

2007 ◽  
Vol 10 (6) ◽  
pp. H184 ◽  
Author(s):  
N. Burbure ◽  
N. G. Rudawski ◽  
K. S. Jones
Keyword(s):  
Defect Formation ◽  
Edge Defect ◽  
Ion Implanted

Investigations of the band structures of edge-defect zigzag graphene nanoribbons using density functional theory

RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 39587-39594 ◽  
Author(s):  
Hye Sook Moon ◽  
Je Moon Yun ◽  
Kwang Ho Kim ◽  
Seung Soon Jang ◽  
Seung Geol Lee
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Graphene Nanoribbons ◽  
Band Structures ◽  
Functional Theory ◽  
Edge Defect ◽  
Zigzag Graphene Nanoribbons

Band structures of edge-oxidized (left) and edge-nitrided (right) zigzag graphene nanoribbons.

scholarly journals Role Played by Edge-Defects in the Optical Properties of Armchair Graphene Nanoribbons

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3229
Author(s):  
Thi-Nga Do ◽  
Godfrey Gumbs ◽  
Danhong Huang ◽  
Bui D. Hoi ◽  
Po-Hsin Shih
Keyword(s):  
Optical Properties ◽  
Graphene Nanoribbons ◽  
Tight Binding ◽  
Edge States ◽  
Binding Model ◽  
Edge Defect ◽  
Flat Bands ◽  
Edge Defects ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

We explore the implementation of specific optical properties of armchair graphene nanoribbons (AGNRs) through edge-defect manipulation. This technique employs the tight-binding model in conjunction with the calculated absorption spectral function. Modification of the edge states gives rise to the diverse electronic structures with striking changes in the band gap and special flat bands at low energy. The optical-absorption spectra exhibit unique excitation peaks, and they strongly depend on the type and period of the edge extension. Remarkably, there exist the unusual transition channels associated with the flat bands for selected edge-modified systems. We discovered the special rule governing how the edge-defect influences the electronic and optical properties in AGNRs. Our theoretical prediction demonstrates an efficient way to manipulate the optical properties of AGNRs. This might be of importance in the search for suitable materials designed to have possible technology applications in nano-optical, plasmonic and optoelectronic devices.

scholarly journals Role Played by Edge-Defects in the Optical Properties of Armchair Graphene Nanoribbons

2021 ◽  
Author(s):  
Thi-Nga Do ◽  
Godfrey Gumbs ◽  
Danhong Huang ◽  
D. Hoi Bui ◽  
Po-Hsin Shih
Keyword(s):  
Optical Properties ◽  
Graphene Nanoribbons ◽  
Tight Binding ◽  
Edge States ◽  
Binding Model ◽  
Edge Defect ◽  
Flat Bands ◽  
Edge Defects ◽  
Armchair Graphene Nanoribbons ◽  
Armchair Graphene

We explore the implementation of specific optical properties of armchair graphene nanoribbons (AGNRs) through edge-defect manipulation. This technique employs the tight-binding model in conjunction with the calculated absorption spectral function. Modification of the edge states gives rise to the diverse electronic structures with striking changes in the band gap and special flat bands at low energy. The optical-absorption spectra exhibit exotic excitation peaks and they strongly depend on the type and period of the edge extension. Remarkably, there exist the unusual transition channels associated with the flat bands for selected edge-modified systems. We discover the special rule governing how the edge-defect influences the electronic and optical properties in AGNRs. Our theoretical prediction demonstrates an efficient way to manipulate the optical properties of AGNRs. This might be of importance in the search for suitable materials designed to have possible technology applications in nano-optical, plasmonic and optoelectronic devices.

A study of trench-edge defect formation in (001) and (011) silicon recrystallized by solid phase epitaxy

2007 ◽  
Vol 101 (2) ◽  
pp. 024908 ◽  
Author(s):  
K. L. Saenger ◽  
J. P. de Souza ◽  
K. E. Fogel ◽  
J. A. Ott ◽  
C. Y. Sung ◽  
...  
Keyword(s):  
Defect Formation ◽  
Solid Phase ◽  
Solid Phase Epitaxy ◽  
Edge Defect

Edge-defect induced spin-dependent Seebeck effect and spin figure of merit in graphene nanoribbons

2017 ◽  
Vol 19 (39) ◽  
pp. 27132-27139 ◽  
Author(s):  
Qing-Bo Liu ◽  
Dan-Dan Wu ◽  
Hua-Hua Fu
Keyword(s):  
Figure Of Merit ◽  
Graphene Nanoribbons ◽  
Seebeck Effect ◽  
Function Approach ◽  
First Principle ◽  
Edge Defect ◽  
First Principle Calculations ◽  
Edge Defects ◽  
Non Equilibrium Green’S Function ◽  
Non Equilibrium

By using first-principle calculations combined with the non-equilibrium Green's function approach, we have studied spin caloritronic properties of graphene nanoribbons (GNRs) with different edge defects.

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