"Structural Studies of Defects and Defect Dynamics in Graphene" by Angus Kirkland (University of Oxford)

Date: 
Thursday, December 3, 2015 - 4:00pm to 5:00pm
Series: 
Physics and Astronomy Colloquium

Thursdays, 4:00-5:00 pm

1-434 Physics and Astronomy (map)
Reception from 3:30-4:00 p.m.
(unless otherwise posted)

Guest Speaker: Angus Kirkland (University of Oxford)

Talk Title:  “Structural Studies of Defects and Defect Dynamics in Graphene”

Abstract:

To usefully deploy Graphene and related materials in electronic applications [1-3] it is essential to understand the behavior of point defects, which have been the subject of extensive research over decades for silicon devices. High resolution Transmission Electron Microscopy is the ideal characterization tool for studying the formation and evolution of defects in Graphene in real space. Moreover, recent instrumental advances make it possible to image these defects at primary electron beam energies below those that cause significant specimen damage whilst retaining sufficient spatial resolution to resolve the local atomic configuration in the Graphene lattice around the defect site [4].

In this paper I will discuss the controlled formation of several defect types in Graphene, including mono- and di-vacancies, dopant mediated defects and dislocations. The evolution of these into more complex extended defects will also be described together with control of their evolution by electron beam irradiation [5]. Density functional theory (DFT) calculations have been used to evaluate the energetics of several defect configurations which indicate possible reaction pathways by which these can evolve and these will be described to verify the experimental data.

References:      

[1] Novoselov, K. S et al.  Nature 2012, 490, 192.

[2] Schwierz, F. Graphene Transistors. Nature Nanotech. 2010, 5, 487.

[3] Britnell, L et al. Science 2012, 335, 947.

[4] Robertson, A.W. et al. Nature Communications 2012, 3, 1144.

[5] Robertson, A.W. et al. ACS Nano 2013, 7 (5), 4495.

 

Acknowledgments Financial Support from EPSRC (Platform Grants EP/F048009/1 and EP/K032518/1) is gratefully acknowledged. Part of this work was supported by the European Union Seventh Framework Programme under Grant Agreement 312483 - ESTEEM2 (Integrated Infrastructure Initiative–I3.

 

For more information, contact Jay Hauser

We thank the following people for their contributions to the wine fund for the post-colloquium reception:
Prof. Dolores Bozovic, Prof. Mike Cornwall, Prof. Bob Cousins, Prof. Andrea Ghez, Prof. Karoly Holczer, Prof. Eric Hudson, Robert Huff, Prof. Alex Kusenko, Prof. Myank Mehta, Prof. John Miao, Prof. Roberto Peccei, Prof. Claudio Pellegrini, Prof. David Saltzberg, Prof. Jean Turner and Prof. Ben Zuckerman.

Event Attachments: 
Location: 
1-434 PAB