Center for Integrated Nanotechnologies

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Grain Structure in Monolayer Semiconductor Revealed Using New Electron Scattering Capability

2022 Science and News Highlights

April 2022
 
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CINT graduate student and user Zachary Milne awarded "Most Technologically innovative poster" by the Chan Zuckerberg Initiative

Poster Abstract: Transmission electron microscopes (TEMs) are an essential tool used extensively across industry and research for material science, nanoscience, and biological innovation. However, after many years of consolidation, the commercial landscape of TEMs risks becoming an oligopoly dominated by a handfulof large players; which may limit the development of new optical geometries. Much of the hesitancy for academics to propose substantial hardware modifications arises from the large purchase price, fear of voiding the warranty/service contract and the fact that many instruments sit in shared usage facilities where downtime would be unacceptable. By contrast, multiphysics simulation packages allow researchers to evaluate potential lens designs rapidly and inexpensively, without the need to disassemble the TEM column and realign it afterwards.
By simulating both the magnetic field generated by the lens and the electron path through this field, changes to the materials or geometry of the lens can be analysed. This offers a wealth of different parameters to tune for the exploration of alternative designs. With this work, we aim to outline an intuitive and accessible methodology through which electron optics can be modelled utilising a ‘virtual twin’ concept. We hope this approach encourages new, creative, and sustainable grass roots innovation to advance TEM capabilities through microscope modification. Poster


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Sandia News Release —Quantum New Mexico Coalition aims to establish state as national hub

Science, education and economic development leaders across New Mexico have formed a coalition to bring future quantum computing jobs to the state.
Sandia, the University of New Mexico and Los Alamos National Laboratory announced the new coalition at UNM during the Quantum New Mexico Symposium.


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Visualizing Grain Statistics in MOCVD WSe2 through Four-Dimensional Scanning Transmission Electron Microscopy

Scientific Achievement: Using four-dimensional scanning transmission electron microscopy, we demonstrate a method to visualize
grains and grain boundaries in WSe2 grown by metal organic chemical vapor deposition (MOCVD) directly onto silicon dioxide. Despite the chemical purity and uniform thickness and texture of the MOCVD-grown WSe2, we observe a high density of small grains that corresponds with the overall selenium deficiency we measure through ion beam analysis. Moreover, reconstruction of grain information permits the creation of orientation maps that demonstrate the nucleation mechanism for new layers–triangular domains with the same orientation as the layer underneath induces a tensile strain increasing the lattice parameter at these sites.

Publication: Londoño-Calderon, Alejandra, Rohan Dhall, Colin Ophus, Matthew Schneider, Yongqiang Wang, Enkeleda Dervishi, Hee Seong Kang, Chul-Ho Lee, Jinkyoung Yoo, and Michael T. Pettes. “Visualizing Grain Statistics in MOCVD WSE2 through Four-Dimensional Scanning Transmission Electron Microscopy.” Nano Letters, 2022. doi.org/10.1021/acs.nanolett.1c04315

 

March 2022

 

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CINT User Annie Xian Zhang Receives $500,000 NSF Career Award
Thanks to a $500,000 Faculty Early Career Development (CAREER) award from the National Science Foundation, which supports early-career faculty who are academic role models, Zhang will investigate how “twisting” two sheets of graphene can alter the thermal properties of two-dimensional (2D) materials and push the limits of thermal modulation.

 

February 2022

 

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CINT Scientist selected 2022 TMS Brimacombe Medalist
Congratulations to Khalid Hattar, 2022 Brimacombe Medalist.

 

 


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Sandia News Release — CINT Scientist to lead materials science organization
Brad Boyce, a materials scientist at Sandia National Laboratories, was elected president of The Minerals, Metals and Materials Society. Boyce will become vice president of the society on March 3 at its annual meeting, and then serve three consecutive one-year terms as vice president, president and past president. He is the second Sandia employee to be elected to lead the professional society.

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