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Direct Quantification of Heat Generation Due to Inelastic Scattering of Electrons Using a Nanocalorimeter

Authors
Park, JoonsukBae, KihoKim, Taeho RoyPerez, ChristopherSood, AdityaAsheghi, MehdiGoodson, Kenneth E.Park, Woosung
Issue Date
Feb-2021
Publisher
WILEY
Keywords
electron beam heating; electron energy loss spectroscopy; heat generation; inelastic scattering; transmission electron microscopy
Citation
ADVANCED SCIENCE, v.8, no.3, pp 1 - 6
Pages
6
Journal Title
ADVANCED SCIENCE
Volume
8
Number
3
Start Page
1
End Page
6
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/1009
DOI
10.1002/advs.202002876
ISSN
2198-3844
2198-3844
Abstract
Transmission electron microscopy (TEM) is arguably the most important tool for atomic-scale material characterization. A significant portion of the energy of transmitted electrons is transferred to the material under study through inelastic scattering, causing inadvertent damage via ionization, radiolysis, and heating. In particular, heat generation complicates TEM observations as the local temperature can affect material properties. Here, the heat generation due to electron irradiation is quantified using both top-down and bottom-up approaches: direct temperature measurements using nanowatt calorimeters as well as the quantification of energy loss due to inelastic scattering events using electron energy loss spectroscopy. Combining both techniques, a microscopic model is developed for beam-induced heating and to identify the primary electron-to-heat conversion mechanism to be associated with valence electrons. Building on these results, the model provides guidelines to estimate temperature rise for general materials with reasonable accuracy. This study extends the ability to quantify thermal impact on materials down to the atomic scale.
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공과대학 > 기계시스템학부 > 1. Journal Articles

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