For advancements in nanotechnology, materials science, and various engineering disciplines it is essential to understand the materials at an atomic level. Transmission Electron Microscopy allows researchers to atomic arrangements and defects through spatial resolution. APT provides 3-D compositional maps with near-atomic resolution. Integration of TEM and APT provides a comprehensive tool for material characterization, spanning the gap between structural and compositional analysis. MaTestLab is one of the leading testing service providers in the USA and Canada. We have a large network of testing laboratories in the USA.
Principle and Methodology of Transmission Electron Microscopy-Aided Atom Probe Tomography
The TEM-APT method associates Transmission Electron Microscopy and Atom Probe Tomography for high-resolution images of a sample providing detailed structural compositional analysis. Using focused ion beam milling samples are prepared which are thin, sharp specimens for electron transmission and field evaporation for APT. TEM provides high-resolution images with diffraction patterns. A high electric field is involved in APT that causes atoms to be field evaporated and then projected onto the detector for a three-dimensional atomic map. From both techniques, data is correlated for a comprehensive understanding of the sample specimen.
Instrumentation
The TEM-APT instrumentation includes an electron microscope with a high-resolution focused ion beam system for sample preparation, an APT system with a high-voltage pulse, cryostat, and detector for transferring samples, and sample transfer systems for transferring samples without contamination and damage. All these components work together to create needle-shaped specimens for APT and reconstruct 3-D compositional maps.
Applications of Transmission Electron Microscopy-Aided Atom Probe Tomography
TEM-APT is used in various fields, including materials science, metallurgy, nanotechnology, semiconductor industry, and geological sciences. It facilitates the study of the atomic structure and composition of materials, the analysis of semiconductor devices, the characterization of nanomaterials, the understanding of microstructural features of metals and alloys, and the analysis of minerals and rocks. Applications include understanding grain boundaries, phase transformations, and alloying element distribution, along with understanding geological processes and Earth’s crust history.
PDF Link for Atom Probe Tomography and MicroscopyAtom Probe Tomography and Microscopy
