Defect formation in Graphene
To understand the defect formation and evolution of graphene at elevated temperatures, the researchers at Oxford University recorded this atomic resolution movie at 700 °C. This required extreme stability for visualizing the evolution of point defects and the vacancy defect can be seen growing from the tip of the adatom cluster, which re-configures into the characteristic zigzag line defect structure. As graphene is a single layer of carbon atoms, any amorphous contamination on top of graphene will decrease the contrast for imaging individual carbon atoms, therefore, heating is needed to remove contamination.
- Wildfire S3 on a JEOL ARM
- Atomic resolution at elevated temperature
- Extreme specimen stability
Alex W. Robertson, et. al.
University of Oxford, United Kingdom
Thermal processing of Metal Alloys
To assist industry in identifying how the annealing process controls the structure of Al alloy, the researchers at Hunan University investigated the precipitation of Al alloy seen in this 8 hour video at 200 °C. The precipitates become visible after 1 hour indicating nucleation is complete and further growth of the precipitates interact with the dislocations. This interaction resulted in the improvement and hardness of the material, highlighting the value of in situ heating TEM enabling researchers to investigate and understand the process-structure-property relationship in one go!
- Wildfire D6 on a FEI Titan
- Industry annealing profile
- No thermal drift / no human interference
Prof. Dr. Jianghua Chen & Chunhui Liu
College of Materials Science & Engineering
Hunan University, China
Build your own Lego TEM
Complete parts list & building instructions
Due to the popular demand at the EMC16 conference, we decided to share with the entire community the complete guide to building your own Lego TEM!
With everything you need to know including parts list, building instructions and online stores to source the bricks needed. Happy Lego building!
Replacing the copper grid sample carriers!
Our range of Nano-Chips (MEMS devices) are functional sample carriers that replace traditional Cu grids. Based on Micro-Electro-Mechanical Systems (MEMS), they offer the unique ability to expand your application space and experiments by controlling the environment locally on the Nano-Chip. Each Nano-Chip creates a micro-scale laboratory environment within your TEM, and due to its very low mass and minimal power consumption are extremely reliable and responsive.
Feature | Climate Publication
Y. Jiang1, H. Li1, Z. Wu1, W. Ye1, Prof. H. Zhang1, *Prof. Y. Wang1, Prof. C. Sun2, Prof. Z. Zhang1
1Zhejiang University, China | 2Monash University, Australia | Contact: *email@example.com
In Situ Observation of Hydrogen-Induced Surface Faceting for Palladium-Copper Nanocrystals at Atmospheric Pressure.
Abstract | Nanocrystal (NC) morphology, which decides the number of active sites and catalytic efficiency, is strongly determined by the gases involved in synthesis, treatment, and reaction. Myriad investigations have been performed to understand the morphological response to the involved gases. However, most prior work is limited to low pressures, which is far beyond realistic conditions. A dynamic morphological evolution of palladium-copper (PdCu) NC within a Nano-Reactor is reported, with atmospheric pressure hydrogen at the atomic scale. In situ transmission electron microscopy (TEM) videos reveal that spherical PdCu particles transform into truncated cubes at high hydrogen pressure. First principles calculations demonstrate that the surface energies decline with hydrogen pressure, with a new order of γH-001 <γH-110 <γH-111 at 1 bar. A comprehensive Wulff construction based on the corrected surface energies is perfectly consistent with the experiments. The work provides a microscopic insight into NC behaviors at realistic gas pressure and is promising for the shaping of nanocatalysts by gas-assisted treatments.