Energy Loss Spectroscopy at High Resolution: Applications to Functional Oxides and Nanoplasmonics

Speaker: 
Dr. Gianluigi Botton
Event Date and Time: 
Mon, 2016-06-20 11:00 - 12:30
Location: 
Hennings 318
Local Contact: 
Andrea Damascelli / Leanne Ebbs

Electron energy loss spectroscopy (EELS) is an invaluable technique to study the detailed structure and the chemical state of materials at unprecedented spatial resolution. Today, this technique is used “routinely” to characterize nanoscale materials used in a myriad of applications from energy storage and conversion, to solid-state devices and biomaterials interfaces. This technique also has the potential to provide insight into much more fundamental problems where the valence state of atoms and their location is of fundamental importance.

In this presentation, I describe recent developments in electron energy loss spectroscopy showing that is possible to probe the changes in bonding and coordination of atoms on surfaces of oxides using novel quantitative measurements of the energy loss spectra [1] and detect small lattice distortions in perovskite compounds [2]. I will show that, with atomic resolution EELS, it is possible to determine ordering of cations in oxides [3] and changes in bonding, at interfaces consistent with modifications in the coordination of interface atoms. I will highlight how atomic resolved experiments with EELS can be used to systematically study the local valence in high-T superconductors [4], as a function of oxygen doping in order to determine the valence state of Cu atoms in chains and planes in YBCO. As a further demonstration of application of this technique, I will show how these quantitative approaches, combined with detailed calculations, can be used to extract the localized hole concentration in superconducting chain-ladder compounds [5].

Finally, I will show some examples of detailed studies of the plasmonic response of metallic nanostructures showing how it is possible to probe details of surface plasmon resonances with much higher spatial resolution than ever possible with light-based techniques [6,7].

[1] G.Z. Zhu, et al. Nature, 490, 384, (2012)
[2] M. Bugnet, et al., Phys. Rev. B 88, 201107(R) (2013), and Phys Rev. B, 93, 020102 (2016)
[3] S. Turner, et al., Chem. Mater. 24, 1904−1909 (2012)
[4] N. Gauquelin, et al., Nature Communications 5, 4275 (2014)
[5] M. Bugnet, et al., Science Advances 2016; 2:e1501652 (2016).
[6] D. Rossouw, et al., Nano Letters 11, 1499-1504 (2011),
[7] D. Rossouw, G.A. Botton, Phys. Rev. Letters 110, 066801 (2013), S. J. Barrow et al, Nano Letters 14, 3799-3808. (2014); Y. Liang; Rossouw, D. et al., Journal of the American Chemical Society 135, 9616-9619. (2013), EP Bellido, et al., ACS Photonics, 3, 428-433 (2016)

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