Environmental Transmission Electron Microscope
Located in EMSL | Stewarded by Libor Kovarik, Materials Transformations Group
Mission
EMSL's FEI Titan 80-300 Environmental Transmission Electron Microscope (ETEM) is a Cs-corrected field emission gun transmission electron microscope. The instrument is equipped with Corrected Electron Optical Systems GmbH double-hexapole aberration corrector (CETCOR) for image forming lens, which allows imaging with sub 0.1 nm resolution in a conventional phase contrast imaging mode. The instrument allows introduction of gaseous environment up to 20 mbars for selected gasses. The gasses are delivered into the instrument with a custom-built gas delivery system. Permanently connected gasses include: N2,He, Ar, O2, H2O, H2, CO, CO2, and CH4. The microscope is equipped with a charge-coupled device (CCD) camera (Gatan UltraScan1000 2k x 2k) for image acquisition. For acquisition in scanning transmission electron microscope imaging mode, the instrument is equipped with high-angle annular dark-field (HAADF) detector (Fishione) and annular dark-field, bright-field detectors (FEI). For elemental analysis, the instrument is equipped with an energy dispersive X-ray analysis Si(Li) detector, collection angle (less than 0.1 srad). The ETEM is used for in situ studies of catalysts, aerosols, energy materials, structural materials, geochemistry materials, and more.
Features
- Electron beam energy: 80 to 300 keV
- Sample operating pressure: 10-7 to 20 mbar
- Sample operating temperature: Up to 1,000°C
- Gases allowed: N2, Ar, O2, H2O, CO, and CO2
- Gas composition controlled with flow controller and monitored using mass spectrometer
- Scanning/transmission electron microscopy with HAADF point-to-point resolution at 300 kV: < 0.14 nm
- High-resolution transmission electron microscope phase contrast resolution (information limit at 300 kV): < 0.1 nm
- High-tilt crystallographic and tomographic analysis
- Si(Li) X-ray energy dispersive spectrometer
- Cryogenic imaging capability
- Sample tilt range: -70°–+70°
- CCD camera: 2k x 2k
- Exit wave function reconstruction from defocus series
- Residual gas analyzer
Related publications:
Luo, L., Su, M., Yan, P., Zou, L., Schreiber, D. K., Baer, D. R., Zhu, Z., Zhou, G., Wang, Y., Bruemmer, S. M., et al. 2018. "Atomic Origins of Water-Vapour-Promoted Alloy Oxidation." Nature Materials, Vol. 17, Issue 6, pp. 1-6.