Hummingbird Scientific’s liquid TEM holder includes an energy-dispersive X-ray spectroscopy (EDS) option for spectroscopic measurement. Our specialized chips ensure the thinnest possible liquid layer, allowing for electron energy loss spectroscopy (EELS) inside the liquid cell. This in turn allows researchers to perform direct elemental analysis and mapping at high magnifications. The EDS liquid-cell holder’s large viewing angle ensures direct access from the sample to the EDS detector.
Researchers at UC Davis, Lawrence Livermore National Laboratory and Pacific Northwest National Laboratory worked with a continuous flow in-situ liquid stage developed by Hummingbird Scientific to obtain electron energy loss spectroscopy (EELS) spectra from nano-particles in colloidal suspension using aberration-corrected scanning transmission electron microscopy (STEM). They show that EELS can be used to quantify the fluid path length around the nano-particle and demonstrate that characteristic core-loss signals from the suspended nano-particles in suspension can be resolved and analyzed to provide information on the local interfacial chemistry with the surrounding environment.
At the 2012 Microscopy and Microanalysis meeting, several talks (among which were also researchers from Oak Ridge National Lab) on this same topic highlighted that this liquid EELS could be instrumental in not only solution based catalysis research, but can also be used in materials research for batteries.
1) Jungjohann, Katherine L., James E. Evans, Jeffery A. Aguiar, Ilke Arslan, and Nigel D. Browning. “Atomic-Scale Imaging and Spectroscopy for In Situ Liquid Scanning Transmission Electron Microscopy.” Microscopy and Microanalysis 18, no. 03 (May 2, 2012): 621-627. Abstract
2) R.R. Unocic, L. Baggetto, K.A. Unocic, G.M. Veith, N.J. Dudney, and K.L. More. “Coupling EELS/EFTEM Imaging with Environmental Fluid Cell Microscopy.” Microscopy and Microanalysis 18 (Suppl 2), 2012 1104-1105 Abstract
Paper and images copyright © 2012, Microscopy and Microanalysis.
Liquid Spectroscopy Selected Publications
|R. R. Unocic, L. Baggetto, G. M. Veith, J. A. Aguiar, K. A. Unocic, R. L. Sacci, N. J. Dudneyb and K. L. Morea. “Probing battery chemistry with liquid cell electron energy loss spectroscopy,” Chem. Commun. Advance Article (2015)||Abstract|
|R.R. Unocic, L. Baggetto, K.A. Unocic, G.M. Veith, N.J. Dudney, and K.L. More. “Coupling EELS/EFTEM Imaging with Environmental Fluid Cell Microscopy.” Microscopy and Microanalysis 18 (Suppl 2), (2012) 1104-1105||Abstract|
|K.L. Jungjohann, J.E. Evans, J.A Aguiar , I. Arslan, N.D. Browning. “Atomic-scale imaging and spectroscopy for in-situ liquid scanning transmission electron microscopy.” Microscopy & Microanalysis 18:03 (2012) pp. 621–627.||Abstract|
|K.L. Jungjohann, J.E. Evans, I. Arslan, N.D. Browning. “Electron Energy Loss Spectroscopy for Aqueous in-Situ Scanning Transmission Electron Microscopy.” Microscopy & Microanaysis 17:S2 (2011) pp. 778–779.||Abstract|