Direct Quantification of Heat Generation Due to Inelastic Scattering of Electrons Using a Nanocalorimeter.
Direct Quantification of Heat Generation Due to Inelastic Scattering of Electrons Using a Nanocalorimeter.
复制标题
直接使用纳米氧计对电子的非弹性散射引起的热量产生。
DOI：
10.1002/advs.202002876
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发表时间：
2021-03
期刊：
影响因子：
--
通讯作者：
Park W
中科院分区：
文献类型：
--
作者：
Park J;Bae K;Kim TR;Perez C;Sood A;Asheghi M;Goodson KE;Park W
透射电子显微镜（TEM）可以说是原子级材料表征的最重要工具。传输电子的能量的很大一部分通过非弹性散射转移到所研究的材料上，通过电离、辐射分解和加热造成无意的损坏。特别是，热量的产生使 TEM 观察变得复杂，因为局部温度会影响材料特性。在这里，使用自上而下和自下而上的方法量化电子辐照产生的热量：使用纳瓦热量计直接测量温度，以及使用电子能量损失光谱量化由于非弹性散射事件造成的能量损失。结合这两种技术，开发了一个用于束诱导加热的微观模型，并确定与价电子相关的主要电子热转换机制。基于这些结果，该模型提供了以合理精度估计一般材料温升的指南。这项研究将量化材料热影响的能力扩展到原子尺度。电子束在穿过固态介质时通过非弹性散射转化为热量，产生的热量通常使实验分析变得复杂。纳米量热计能够捕获电子束引起的热量，同时，电子能量损失光谱测量表明，关键的能量转换是由外壳中的电子负责的。
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. Electron beam is converted to heat via inelastic scattering while traversing a solid‐state medium and the generated heat often complicates experimental analysis. A nanocalorimeter enables capturing heat generation induced by electron beams, and in parallel, the electron energy loss spectroscopy measurements reveal that a key energy conversion is to be responsible for the electrons in an outer shell.
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影响因子：
2.5
作者：
Iakoubovskii, K.;Mitsuishi, K.;Furuya, K.
通讯作者：
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影响因子：
3.7
作者：
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作者：
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作者：
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通讯作者：
McElwee-White, L