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3D Nanoscale Imaging using Electron Tomography

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Electron tomography has become an established tool for 3D visualization and characterisation not only in the life sciences but also now in the physical sciences, and especially in the study of complex nanoscale materials and structures. There is a need not only to study the morphology of a structure but also its physical and chemical properties in three dimensions. As such, electron tomography in materials science has developed very quickly over the past few years using a wide range of imaging modes to capture this 3D information. These modes include STEM HAADF imaging for 3D visualization of morphology, particle distribution and porosity, through to weak-beam and STEM dark-field imaging to study 3D dislocation networks, 4D plasmon imaging to discern different chemical species and electron holo-tomography to understand the 3D electrostatic potential distribution in semiconductor devices. In this talk, I will highlight a number of examples from across a broad range of materials that illustrates how electron tomography can provide high resolution 3D information that would be difficult if not impossible to determine with any other technique.

References Arslan I., Yates T.J.V., Browning N.D. and Midgley PA (2005) ‘Embedded Nanostructures revealed in Three Dimensions’ Science 309 2195-2198.

Barnard J. S., Sharp J., Tong J. R. and Midgley P. A. (2006) ‘High-Resolution Three-Dimensional Imaging of Dislocations’, Science, 313, 319

Gass M.H., Koziol K. K., Windle A.H. and Midgley P.A., (2006) ‘Four-Dimensional Spectral Tomography of Carbonaceous Nanocomposites’ Nano Letters 6 (3) 376-379

Midgley P.A. and Weyland M. (2003), ‘3D Electron Microscopy in the Physical Sciences: the Development of Z-contrast and EFTEM Tomography’, Ultramicroscopy 96 413

Twitchett-Harrison AC, Yates TJV , Newcomb SB, Dunin-Borkowski RE and Midgley PA. (2007) ‘High-resolution three-dimensional mapping of semiconductor dopant potentials’ Nano Letters 7 (7): 2020-2023

Ward EPW , Yates TJV , Fernandez JJ, Vaughan DEW and Midgley PA (2007) ‘Three-Dimensional Nanoparticle Distribution and Local Curvature of Heterogeneous Catalysts Revealed by Electron Tomography’ J Phys Chem C 111 , 11501-11505

This talk is part of the Mineral Sciences Seminars series.

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