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Electron Microscopy Facility

Electron Microscopy

This facility consists of five top-of-the line transmission electron microscopes, two of which are highly specialized instruments capable of extreme levels of resolution, achieved through spherical aberration correction. The facility is also equipped with extensive sample-preparation capabilities. The scientific interests of the staff focus on understanding the microscopic origin of the physical and chemical behavior of materials, with specific emphasis on in-situ studies of materials in native, functional environments.


  • Atomic-resolution imaging of internal materials structure with scanning transmission and transmission electron microscopy
  • Spectroscopic characterization with energy dispersive x-ray spectroscopy and electron energy loss spectroscopy. Real time studies of processing / structure / property relationships in nanostructured materials, including in liquid and gaseous environments
> Electron Microscopy Group

Instrument Details

Hitachi HD2700C, a dedicated Scanning Transmission Electron Microscope (STEM)

Contacts: Sooyeon Hwang

energy vs. intensityThis is a state-of-the-art dedicated 200kV cold field emission STEM with an aberration-corrector for the probe-forming lens. It is the first Hitachi-made aberration corrected electron microscope. The aberration corrector improves the spatial resolution (probe size) to <0.1 nm, while boosting the probe current to 200 pA. The instrument is optimized for spectroscopic imaging and simultaneous acquisition of “Z-contrast” images and electron energy-loss spectroscopy (EELS). It is equipped with five detectors for various settings using different convergent angles and collection angles in annular-dark-field imaging. It is also equipped with a high resolution electron energy-loss spectrometer which can routinely achieve an energy resolution of 0.35eV at zero energy-loss. The instrument is shielded within a metal box to reduce acoustic noise. A SDD EDX detector is installed to perform STEM-EDX analysis for heavy elements at atomic resolution. This microscope is capable of high-resolution imaging and microscopy functions including: HAADF-STEM, LAADF-STEM, BF-STEM, STEM-EELS, and STEM-EDX. The Hitachi STEM is particularly good at resolving the chemical and electronic information of materials at the deep nanoscale.

FEI Titan 80-300, a dedicated Environmental Transmission Electron Microscope (E-TEM)

Contact: Dmitri Zakharov

FEI TitanThis instrument is the first 80-300kV field-emission environmental transmission electron microscope to be installed in the US with an objective-lens aberration corrector. It has a spatial resolution of 0.08nm in the high-resolution phase contrast mode, and  can achieve this resolution at unusually high pressures due to the differential pumping apertures and custom pumping arrangement that is incorporated with the system. The maximum gas pressure for the environmental-cell is about 20mbar for N2, with other maximum pressures dependent on the atomic weight of the gas. As a result, this instrument is uniquely well-suited to image the fundamental mechanisms of catalysis and catalyzed nanostructure growth. The instrument also has scanning transmission imaging (STEM), magnetic imaging, and chemical analysis capabilities. In addition, a Lorentz lens and a bi-prism allows imaging electrostatic and magnetic potentials or fields in materials. The FEI Titan is also equipped with an energy dispersive x-ray spectrometer and an electron energy-loss image filter spectrometer.  A mass-flow controlled catalytic reaction system capable of providing controlled pressures of gas mixtures will be installed in the near future.

FEI Talos 200x an operando Scanning Transmission Electron Microscope

Contact: Kim Kisslinger

FEI alos The FEI Talos F200X is a high-resolution analytical scanning/transmission electron microscope (S/TEM) that is routinely operated at 200 keV. This microscope is equipped with an X-FEG electron source module that gives a source brightness four times that of a Schottky FEG emitter. This high source brightness enables near diffraction limited imaging and dramatically improves the spectroscopic performance. In addition to the extra-bright gun, it combines outstanding high-resolution scanning/transmission electron microscope and TEM imaging with a four-quadrant 0.9-sr energy dispersive X-ray spectrometer (EDS) for elemental and compositional mapping. Talos F200X allows for the fastest and most precise EDS analysis in all dimensions, along with HRTEM imaging with fast navigation for in-situ microscopy. The instrument is custom designed to have an objective-area pressure interlock and differential pumping capabilities close to the gun to protect the field emitter from any gas leakage event. Due to this protection feature, gas- and liquid-cell operando holders can be readily used in this system to study reaction dynamics under liquid and gas environments.

JEOL JEM2100F, a high-resolution Analytical Transmission Electron Microscope (ATEM)

Contact: Lihua Zhang

This is the center’s workhorse instrument. It is a 120-200kV scanning transmission and transmission field-emission electron microscope (STEM/TEM) for high-resolution analytical structural characterization. It is equipped with a chottky field-emission gun and two exchangeable objective-lens pole-pieces (an ultra high-resolution pole-piece with a 0.19 nm point-to-point resolution and a ±20° sample tilt, and a high-resolution pole-piece with a 0.23 nm point-to-point resolution and a ±40° sample tilt). The instrument is also equipped with an energy dispersive x-ray spectrometer and electron energy-loss spectrometer for chemical analysis, and heating holder and cooling holder and nanofactory holder for in-situ experiments and dynamic observations, including one of the few existing liquid helium TEM holders in the world, which achieves a lowest temperature of 20 K. It is a user-friendly electron microscope. Users and students can be trained to operate the instrument. .

JEOL JEM-1400 LaB6 120 KV Transmission Electron Microscope

Contact: Fernando Camino

The JEOL JEM-1400 LaB6 120 kV transmission electron microscope is an easy-to-use, high contrast instrument with excellent imaging (TEM and STEM modes) and analytical (energy dispersive spectroscopy detector) capabilities. With an easily changeable accelerating voltage range of 40-120 keV, the JEM-1400 TEM is highly suitable for polymer, biological, and materials science applications. Usually, after one training session, users unfamiliar with electron microscopy can use the instrument independently for TEM imaging purposes.

TEM Sample Preparation Facilities

Contact: Kim Kisslinger

Sample preparation is a critical and often underestimated aspect of transmission electron microscopy. Sample preparation for TEM can be a complex and involved procedure drawing upon a variety of mechanical and non-mechanical methods. The method chosen for TEM sample preparation is highly specific to the material to be analyzed and the desired information to be attained. Thin high quality TEM samples should have a thickness that is roughly equal to the mean free path electrons that transmit through the sample, which may only be a few tens of nanometers. The CFN maintains an array of equipment enabling a variety of standard TEM sample preparation capabilities. While users are generally expected to carry out their own specimen preparation, guidance and expertise may be provided by CFN electron microcopy staff.

Image Analysis Facility

The EM Group has a full range of image processing and analysis software for the interpretation of data.  These includes, one 4-core, dual quad MacPro, equipped with MacTempas (for HREM/STEM image simulation and exit-wave reconstruction), CrystalKit and Adobe Photoshop (Fovea Pro Image analysis plug-ins) and one 4-core dual-quad PC with Digital Micrograph, True Image (exit wave reconstruction), and Inspect3D / Amira (tomographic reconstruction).