Dr Christopher Allen

Senior Staff Scientist in Aberration Corrected Electron Microscopy

Chris completed his MPhys undergraduate degree in physics at the University of Leeds in 2004. His masters thesis, supervised by Prof. Chris Marrows, was on the interplay between ferromagnetism (FM) and superconductivity (SC) in FM/SC heterostructures.

After spending a year travelling Chris returned to Leeds to study for his PhD under the supervision of Prof. Bryan Hickey investigating the links between the structure of carbon nanotubes and their electronic properties.

On completion of his PhD in 2009 he was awarded an EPSRC PhD plus fellowship to continue his work on carbon nanotubes at Leeds.

In June 2011 Chris joined the Department of Materials in Oxford. His primary focus was studying carbon nano-materials including their synthesis, characterisation (using high-resolution transmission electron microscopy) and electronic transport properties.

Chris currently holds the role of senior staff scientist at the electron physical sciences imaging centre (ePSIC) based at diamond light source.

 
Manipulating a carbon nanotube onto electrodes. Electron diffraction from a DWCNT. HRTEM image of fullerene coalescence within a SWCNT. False colour HRTEM image of a defect in the inner tube of a DWCNTOptically enhanced charge transfer in hybrid carbon nano-devices.Temperature dependence of atomic vibrations in mono-layer graphene.
 

Journal Articles

A. W. Robertson, Y.-C. Lin, S. Wang, H. Sawada, C. S. Allen,, Q. Chen, S. Lee, G.-D. Lee, J. Lee, S. Han, E. Yoon, A. I. Kirkland, H. Kim, K. Suenaga, J. H. Warner. Atomic Structure and Spectroscopy of Single Metal (Cr, V) Substitutional Dopants in Monolayer MoS2. ACS Nano, 10, 11, 10227-10236 (2016)

K. Luo, M. R. Roberts, R. Hao, N. Guerrini, E. Liberti, C. S. Allen,, A. I. Kirkland, P. G. Bruce. One-pot Synthesis of Lithium-rich Cathode Material with Hierarchical Morphology. Nano Letters, DOI:10.1021/acs.nanolett.6b03296 (2016)

C. Gong, A. W. Robertson, K. He, G.-D. Lee, E. Yoon, C. S. Allen,, A. I. Kirkland, J. H. Warner. Thermally induced dynamics of dislocations in graphene at atomic resolution. ACS Nano, 9, 10, 10066-10075 (2015)

A. W. Robertson, G.-D. Lee, K. He, Y. Fan, C. S. Allen, S. Lee, H. Kim, E. Yoon, H. Zheng, A. I. Kirkland, J. H. Warner. Partial Dislocations in Graphene and Their Atomic Level Migration Dynamics. Nano Letters, 15, 9, 5950-5995(2015)

C. S. Allen, E. Liberti, J. S. Kim, Q. Xu, Y. Fan, K. He, A. W. Robertson, H. W. Zandbergen, J. H. Warner, A. I. Kirkland. Temperature dependence of atomic vibrations in mono-layer graphene. Journal of Applied Physics, 118, 7, 074302 (2015)

K. He, A. W. Robertson, C. Gong, C. S. Allen, Q. Xu, H. Zandbergen, J. C. Grossmanm, A. I. Kirkland, J. H. Warner. Controlled formation of closed-edge nanopores in graphene. Nanoscale, 7, 11602-11610 (2015)

K. He, A. W. Robertson, Y. Fan, C. S. Allen, Y. C. Lin, K. Suenaga, A. I. Kirkland, J. H. Warner. Temperature dependence of the reconstruction of zigzag edges in graphene. ACS Nano, 9, 5, 4786-4795 (2015)

C. S. Allen, G. Liu, Y. Chen, A. W. Robertson, K. He, K. Porfyrakis, J. Zhang, G. A. D. Briggs, J. H. Warner. Optically enhanced charge transfer between C60 and single-wall carbon nanotubes in hybrid electronic devices.Nanoscale, 6, 572-580, (2014).

A. W. Robertson, B. Montanari, K. He, C. S. Allen, Y. A. Wu, N. Harrison, A. I. Kirkland, J. H. Warner. Structural Reconstruction of the Graphene Monovacancy. ACS Nano, 7, 5, 4495–4502, (2013).

A. W. Robertson, B. Montanari, K. He, J. Kim, C. S. Allen, Y. A. Wu, J. Olivier, J. Neethling, N. Harrison, A. I. Kirkland, J. H. Warner, Dynamics of Single Fe Atoms in Graphene Vacancies. Nano Letters, 13, 4, 1468-1475, (2013).

A. W. Robertson, C. S. Allen, Y. A. Wu, K. He, J. Olivier, J. Neethling, A. I. Kirkland, J. H. Warner, Spatial Control of Defect Creation in Graphene at the Nanoscale. Nature Communications, 3, 1144, (2012).

C. S. Allen, A. W. Robertson, A. I. Kirkland, J. H. Warner. The Identification of Inner Tube Defects in Double-Wall Carbon Nanotubes. Small, 8, 24, 3810-3815 ,(2012).

Y. A. Wu, Y. Fan, S. Speller, G. L. Creeth, J. T. Sadowski, K. He, A. W. Robertson, C. S. Allen, J. H. Warner. Large Single Crystals of Graphene on Melted Copper Using Chemical Vapor Deposition. ACS Nano, 6, 6, 5010-5017, (2012).

Y. S. Chaudhary, T. W. Woolerton, C. S. Allen, J. H. Warner, E. Pierce, S. W. Ragsdale, F. A. Armstrong. Visible light-driven CO2 reduction by enzyme coupled CdS nanocrystals. Chemical Communications, 48, 58-60 (2012).

C. S. Allen, Y. Ito, A. W. Robertson, H. Shinohara, J. H. Warner. Two-dimensional coalescence dynamics of encapsulated metallofullerenes in carbon nanotubes. ACS Nano, 5, 12, 10084-10089, (2011).

C. S. Allen, M. D. Elkin, G. Burnell, C. Zhang, S. Hofmann, J. Robertson, B. J. Hickey. Transport measurements on carbon nanotubes structurally characterized by electron diffraction. Physical Review B, 84, 115444, (2011).

C. S. Allen, C. Zhang, G. Burnell, A. P. Brown, J. Robertson, B. J. Hickey. A review of methods for the accurate determination of the chiral indices of carbon nanotubes from electron diffraction patterns. Carbon, 49, 4961-4971, (2011).

C. S. Allen, M. D. Elkin, C. Zhang, S. Hofmann, G. Burnell, J. Robertson, B. J. Hickey. Device fabrication with precisely placed carbon nanotubes of known chiral vector. Journal of Physics: Conference Series, 241, 012082 (2010).

C. Zhang, F. Yan, C. S. Allen, B. C. Bayer, S. Hofmann, B. J. Hickey, D. Cott, G. Zhong, J. Robertson. Growth of vertically-aligned carbon nanotube forests on conductive cobalt disilicide support. Journal of Applied Physics, 108, 024311, (2010).

J. E. McKendry, C. S. Allen, K. Critchley, M. L. Gorzny, A. S. Walton, S. D. Evans. Magnetic field enhanced nano-tip fabrication for four-probe STM studies. Nanotechnology, 19, 085201, (2008).

A. S. Walton, C. S. Allen, K. Critchley, M. L. Gorzny, J. E. McKendry, R. M. D. Brydson, B. J. Hickey, S. D. Evans. Four-probe electrical transport measurements on individual metallic nanowires. Nanotechnology, 18, 065205, (2007).

 

Book chapters

C. S. Allen and J. H. Warner. Chapter 3.1 Properties of Graphene - Electronic properties in Graphene: Fundamentals and Emergent Applications, Elsevier 2013.

C. S. Allen and J. H. Warner. Chapter 5.8 Characterisation Techniques - Hall mobility and Field-effect Mobility in Graphene: Fundamentals and Emergent Applications, Elsevier 2013.

Code contributions

Stoner Python package : Python scientific data analysis code (University of Leeds).

 

Contact Details

30.15 Holder Building
Department of Materials, University of Oxford
Parks Road, Oxford, OX1 3PH
Telephone: 01865 273661
Fax: 01865 273789
E-mail:christopher.allen(at)materials.ox.ac.uk