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Titan ETEM

The Titan ETEM is a transmission electron microscopy equipped with a field emission electron source, a monochromator and an aberration corrector on the objective lens. This gives the microscope a resolution of about 0.8Å in TEM mode. Other tecniques available on the microscope are scanning transmission electron microscopy (STEM, resolution 1.4 Å) with both high-angle annular dark-field (HAADF) and bright-field (BF) detectors. On the analytical side, the microscope is equipped with Oxford X-Max SDD X-ray detector for Energy Dispersive X-ray (EDX) spectroscopy and Gatan Tridiem 965 imaging filter allowing for electron energy-loss spectroscopy (EELS) and energy-filtered imaging. For imaging, the microscope is equipped with Gatan US1000 cameras before and after the energy filter.
The microscope is equipped with a differential pumping system which allows gases to be introduced around the sample to a pressure on the order of 10 mbar (gas specie dependent). Several gases are permanently mounted on the system: Hydrogen, helium, methane carbon monoxide, nitrogen and oxygen. Additional gases and gas mixtures can be added as needed. Please contact Cen staff if you need other gases.

Schematic of the Titan ETEM differential pumping system.

As a high-resolution TEM, the Titan ETEM is very versatile. It has been used to study materials such as catalysts, steels, graphene, polymers, oxides and fuel cells. If you have special requests, please come and see us.

Sample holders

All TEM sample holders available at DTU Cen are compatible with the Titan ETEM. The lab has holders for heating (furnace and MEMS-based), cooling, biasing and tomography. For information on the holder see HERE

Booking

All activities and booking of the Titan ETEM is coordinated by Thomas Willum Hansen. This is done in order to keep the microscope column as clean as possible and separate experiments with different gaseous species in time in order to avoid or minimize cross-contamination between experiments.

Contact information can be found in LabManager:

Titan ETEM in LabManager

Who may operate the Titan ETEM

In order to start training on the Titan ETEM you must by fully trained in the Tecnai TEM. Most of the basic operation on the Titan ETEM is the same as on the Tecnai with the added complexity of the aberration corrector and the monochromator.

The training is conducted in two steps (as needed). In the first step, you will be trained on the special aspects of the microscope, i.e. the monochromator and the aberration corrector. In the second step, we will familiarize you with the differential pumping system and the gas inlet system.

When you have demonstrated a high level of familiarity with the microscope you are allowed to book it via Lab Manager and use it 24/7.

Process information

Link to process pages - e.g. one page for each material

Example:

Test1

Comparison between TEMs at DTU Cen

Microscope		Titan ATEM	Titan ETEM	Tecnai TEM
Purpose		High-resolution STEM imaging Analytical microscopy Holography	High-resolution TEM imaging ETEM experiments	TEM characterization Spectroscopic charaterization
Resolution	TEM mode	1.4 Å	0.8 Å	1.6 Å
Resolution	STEM mode	0.8 Å	1.4 Å	1.5 nm
Spectroscopy	EDX	Oxford X-Max/AZtec	Oxford X-Max/AZtec	Oxford X-Max/AZtec
	EELS	Gatan Tridiem GIF	Gatan 965 Tridiem GIF	Gatan Tridiem GIF

Selected publications from ETEM groups around the globe

T. W. Hansen et al., Atomic-resolution in situ transmission electron microscopy of a promoter of a heterogeneous catalyst. Science 294, 1508-1510 (2001).

P. L. Hansen et al., Atom-Resolved Imaging of Dynamic Shape Changes in Supported Copper Nanocrystals. Science 295, 2053-2055 (2002).

J. B. Wagner et al., In Situ Electron Energy Loss Spectroscopy Studies of Gas-Dependent Metal-Support Interactions in Cu/ZnO Catalysts. J. Phys. Chem. B 107, 7753-7758 (2003).

S. Helveg et al., Atomic-scale imaging of carbon nanofibre growth. Nature 427, 426-429 (2004).

T. W. Hansen, J. B. Wagner, R. E. Dunin-Borkowski, Aberration corrected and monochromated environmental transmission electron microscopy: challenges and prospects for materials science. Mater. Sci. Technol. 26, 1338-1344 (2010).

T. J. Booth et al., Discrete Dynamics of Nanoparticle Channelling in Suspended Graphene. Nano Lett. 11, 2689-2692 (2011).

T. W. Hansen, J. B. Wagner, Environmental Transmission Electron Microscopy in an Aberration-Corrected Environment. Microsc. Microanal. 18, 684-690 (2012).

W. F. van Dorp et al., Molecule-by-Molecule Writing Using a Focused Electron Beam. ACS Nano 6, 10076-10081 (2012).

H. Yoshida et al., Visualizing Gas Molecules Interacting with Supported Nanoparticulate Catalysts at Reaction Conditions. Science 335, 317-319 (2012).

T. W. Hansen, A. T. Delariva, S. R. Challa, A. K. Datye, Sintering of Catalytic Nanoparticles: Particle Migration or Ostwald Ripening? Acc. Chem. Res. 46, 1720-1730 (2013).

B. K. Miller, P. A. Crozier, Analysis of catalytic gas products using electron energy-loss spectroscopy and residual gas analysis for operando transmission electron microscopy. Microsc. Microanal. 20, 815-824 (2014).

P. A. Crozier, T. W. Hansen, In situ and operando transmission electron microscopy of catalytic materials. MRS Bull. 40, 38-45 (2015).