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Dr Sean M. Collins

Photo of Sean Collins

My research focuses on spatially resolved spectroscopy and spectroscopic tomography in the electron microscope. Electron energy loss spectroscopy in the scanning transmission electron microscope (STEM-EELS) reveals composition as well as chemical bonding and oxidation state information – with nanometre to atomic spatial resolution. When combined with tomographic approaches, these techniques enable three-dimensional microstructural characterization. I am particularly interested in using electron tomography and spectroscopy to examine amorphous materials where conventional crystallographic approaches do not provide significant image contrast. In turn, these observations reveal assembly processes in materials such as metal-organic framework glass composites (in collaboration with T. Bennett).

 I also use monochromated EELS to examine the optical properties of materials at ultraviolet, visible, and infrared energies, building off previous work in surface plasmons and the optical properties of metal nanoparticles.

 

S.M. Collins, E. Ringe, M. Duchamp, Z. Saghi, R.E. Dunin-Borkowski, P.A. Midgley. “Eigenmode tomography of surface charge oscillations of plasmonic nanoparticles by electron energy loss spectroscopy.” ACS Photonics 2015, 11, 1628-1635.

URL: http://dx.doi.org/10.1021/acsphotonics.5b00421


S.M. Collins, P.A. Midgley. “Surface plasmon excitations in metal spheres: Direct comparison of light scattering and electron energy-loss spectroscopy by modal decomposition.” Phys. Rev. B 2013, 87, 235432.

URL: http://dx.doi.org/10.1103/PhysRevB.87.235432

A.I. Carim, S.M. Collins, J.M. Foley, S. Maldonado. “Benchtop electrochemical liquid-liquid-solid growth of nanostructured crystalline germanium.” J. Am. Chem. Soc. 2011, 133, 13292-13295. 

URL http://dx.doi.org/10.1021/ja205299w

 

A list of publications and conference papers is available here. My Departmental webpage can be found here.