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Michael Motala, Nicholas Glavin, and their colleagues at the Air Force Research Laboratory, UES Inc., Rice University, University of Pennsylvania, UNICAMP, University of Dayton, and University of Illinois- Urbana-Champaign published on their use of the Hummingbird Scientific in-situ MEMS heating + biasing TEM holder to heat sub-nanometer sequentially-layered metal heterostructures on sapphire and SiO2 substrates.
a) Schematic illustration of Mo/W superlattice. b) EDS map of Mo/W/Mo/W heterostructure. STEM and EDS spectra of sample annealed at c) 400 C, d) 600 C, and e) 800 C. f) In-situ TEM annealing of Mo/W metal films in vacuum, including bright field TEM images and SAED patterns. Copyright © 2024 Elsevier B.V.
Mo, W, and Mo/W layered superlattices were converted into MoSe2, WSe2 and MoSe2/WSe2 using H2Se annealing. Upon in-situ vacuum heating to various temperatures, the fabricated films converted into 2D van der Waals (vdW) superlattices, heterostructures, and alloys with novel bulk properties such as reduced bandgap, enhanced light-matter coupling, and increased catalytic performance. The Hummingbird heating + biasing TEM holder experiences minimal drift across the experimental temperature range, even at atomic resolution, enabling in-situ imaging of the atomic restructuring of metal films. The elegant synthesis procedure will facilitate rapid characterization and tailoring of novel materials for industrial applications.
Reference:
M.J. Motala, X. Zhang, P. Kumar, E.F. Oliveira, A. Benton, P. Miesle, R. Rao, P.R. Stevenson, D. Moore, A. Alfieri, J. Lynch, D. Austin, S. Post, G. Gao, S.Mac, H. Zhu, Z. Wang, I. Petrov, E.A. Stach, W.J. Kennedy, S. Vangala, J.M. Tour, D.S. Galvao, D. Jariwala, C. Muratore, M. Snure, P.M. Ajayan, N.R. Glavin Materials Today Nano 22 100319 (2023) DOI: 10.1016/j.mtnano.2023.100319
Copyright © 2024 Elsevier B.V.
