User:ASelino16/sandbox
It is Wednesday, August 31, 2022, 11:51 AM. I am starting my Sandbox page.
Atomic Electron Tomography (AET)[edit]
Atomic level resolution in 3D electron tomography reconstructions has been demonstrated. Reconstructions of crystal defects such as stacking faults, grain boundaries, dislocations, and twinning in structures have been achieved.[1] This method is relevant to the physical sciences, where cryo-EM techniques cannot always be used to locate the coordinates of individual atoms in disordered materials. AET reconstructions are achieved using the combination of an ADF-STEM tomographic tilt series and iterative algorithms for reconstruction. Currently, algorithms such as the real-space algebraic reconstruction technique (ART) and the fast fourier transform equal slope tomography (EST) are used to address issues such as image noise, sample drift, and limited data.[2] AET has been used to find the 3D coordinates of 3,769 atoms in a tungsten needle with 19 pm precision [3] and 20,000 atoms in a multiply twinned palladium nanoparticle.[4] The combination of AET with electron energy loss spectroscopy (EELS) allows for investigation of electronic states in addition to 3D reconstruction. [5] Challenges to atomic level resolution from electron tomography include the need for better reconstruction algorithms and increased precision of tilt angle required to image defects in non-crystalline samples.
Different tilting methods[edit]
Standard single-tilt sample holders have a limited rotation of ±80°, leading to a missing wedge in the reconstruction. Another solution is to use needle shaped-samples to allow for full rotation.
References[edit]
- ^ Miao, J.; Ercius, P.; Billinge, S. J. L. (23 September 2016). "Atomic electron tomography: 3D structures without crystals". Science. pp. aaf2157–aaf2157. doi:10.1126/science.aaf2157. Retrieved 13 December 2022.
- ^ Saghi, Zineb; Midgley, Paul A. "Electron Tomography in the (S)TEM: From Nanoscale Morphological Analysis to 3D Atomic Imaging". Annual Reviews of Materials Research 2012. Retrieved 13 December 2022.
- ^ Xu, Rui; Chen, Chien-Chun; Wu, Li; Scott, M. C.; Theis, W.; Ophus, Colin; Bartels, Matthias; Yang, Yongsoo; Ramezani-Dakhel, Hadi; Sawaya, Michael R.; Heinz, Hendrik; Marks, Laurence D.; Ercius, Peter; Miao, Jianwei (November 2015). "Three-dimensional coordinates of individual atoms in materials revealed by electron tomography". Nature Materials. pp. 1099–1103. doi:10.1038/nmat4426.
- ^ Pelz, Philipp M.; Groschner, Catherine; Bruefach, Alexandra; Satariano, Adam; Ophus, Colin; Scott, Mary C. (25 January 2022). "Simultaneous Successive Twinning Captured by Atomic Electron Tomography". ACS Nano. pp. 588–596. doi:10.1021/acsnano.1c07772.
- ^ Bals, Sara; Goris, Bart; De Backer, Annick; Van Aert, Sandra; Van Tendeloo, Gustaaf (1 July 2016). "Atomic resolution electron tomography". MRS Bulletin. pp. 525–530. doi:10.1557/mrs.2016.138.