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Multimodal Methods for In Situ Transmission Electron Microscope

The application of transmission electron microscopy (TEM) related techniques have extended from ex situ nanoscale characterization of structure and chemistry of reaction products to dynamic measurements of nanostructures during reaction processes. Commercially-available modified TEM specimen holders and TEM columns (environmental scanning-transmission electron microscope or ESTEM) are being routinely employed to follow the structural and chemical changes at elevated temperatures and under controlled atmospheres. The combination of atomic-resolution images and high spatial and energy resolution has successfully revealed the functioning of catalyst nanoparticles. We have been involved in advancing technical and analytical techniques for unveiling gas-solid interactions at nanoscale. We have incorporated a free-standing, light focusing system in the ESTEM to excite and collect vibrational and optical spectroscopies under reactive environments. This bimodal data collection enables the acquisition of vibrational spectroscopy data concurrently with electron microscopy data, (imaging, diffraction, electron energy-loss spectroscopy(EELS)), under identical environment, and expands the spatial resolution from nanoscale to microscale.[1] For example, we have collected Raman signals from ≈ 80 µm 2 areas, while collecting atomic-resolution videos from 200 nm 2 area, during in situ growth of single-walled carbon nanotubes (SWCNT) at ≈ 625 °C in ≈ 0.005 Pa of C 2 H 2 .[2] Recently, we have applied (LSP) resonance energy initiate a chemical reaction at room temperature.[3] most the chemical overcome by heating the reactants thermal heat reaction reduced reactant molecules on the catalyst nanoparticle LSP resonance replace the thermal to initiate reactions at low temperatures, even at room temperature, mimicking