Opportunity at National Institute of Standards and Technology (NIST)
In Situ Atomic Scale Characterization of Gas-Solid Interactions
Physical Measurement Laboratory, Nanoscale Device Characterization Division
||Gaithersburg, MD 20899
Please note: This Agency only participates in the February and August reviews.
Measurement and understanding of gas-solid interactions is relevant to a number of industrially important processes such as catalysis and the synthesis of nanomaterials. Characterization of such complex, time-dependent transformations requires the use of advanced methodologies that enable the underlying chemical and physical processes to be identified and understood. We are using spectroscopy (e.g., Raman) concurrently with an aberration corrected environmental scanning transmission electron microscope (ESTEM) equipped with a monochromated electron source to make in situ observations and quantify the dynamic processes, at the nano and micro-scale, affecting both the material structure and chemistry during gas-solid interactions. Topics of interest include but are not limited to: (1) carbon nanotube synthesis by catalytic chemical vapor deposition, (2) redox reactions of ceria based oxides, (3) local surface plasmon resonance of metal nanoparticles using electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL), and (4) gas-solid interactions during catalysis. The Raman-ESTEM lab is part of the NIST Center of Nanoscale Science and Technology where new measurements are developed to advance nanotechnology.
Sharma R: Experimental set up for in situ Transmission Electron Microscopy observation of chemical processes (Review), Micron 43: 1147-1155, 2012
Mazzucco S, Tanase YM, Picher M, Li K, Wu Z, Irle S, Sharma R: Direct Evidence of Active and Inactive Phases of Fe Catalyst Nanoparticles for Carbon Nanotube Formation, Journal of Catalysis 319: 56-40, 2014
Gas-solid interaction; Environmental scanning transmission electron microscope; Catalysis; Carbon nanotubes; Local surface plasmon resonance; In situ Raman spectroscopy; In situ TEM;
Open to U.S. citizens
Open to Postdoctoral applicants