Atomic level EELS color map of a Pt/Ru catalyst nanoparticle
Paolo Longo, Ph.D., Gatan, Inc. Sample courtesy of Professor Gianluigi Botton at CCEM, Hamilton, ON, Canada Microscope courtesy of CCEM, Hamilton ON, Canada Acknowledgement to Dr. Andreas Korinek at CCEM for helping set up microscope for experiment.

Atomic level EELS color map of a Pt/Ru catalyst nanoparticle

Methods

Probe and image corrected FEI Titan TEM/STEM microscope; X-FEG emission gun; GIF Quantum® ERS system; Pt M4,5-edges at 2120 eV (red) and Ru L2,3-edges at 2838 eV (green); voltage: 300 kV; STEM mode; EELS low core-loss spectrum (1500 – 3500 eV) exposure time: 18 ms; EELS high core-loss spectrum (200 – 2200 eV) exposure time: 1 ms; convergence angle: 19 mrad; collection angle: 34 mrad; beam current: 260 pA; total exposure time: just over 3 min