Catalyst particle sizes from Rutherford scattered intensities
Catalyst particle sizes from Rutherford scattered intensities
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根据卢瑟福散射强度计算催化剂粒径
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
S. Rice
中科院分区：
文献类型：
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作者：
M. Treacy;S. Rice
我们表明，在一个小的支持催化剂簇的原子数可以估计从电子散射到一个高角度的环形探测器在STEM的强度。该技术与由克鲁、沃尔、朗莫尔和艾萨克森开发的Z对比度方法有关。当负载在低原子序数载体上时，其对于高原子序数催化剂颗粒效果最好，例如γ-氧化铝上的Pt。该方法特别适用于检测和测量亚纳米尺寸范围内的颗粒，其中亮场图像不可靠。与Z对比度方法不同，使用高角度环形检测器，这避免了由布拉格反射引起的强度调制。该信号主要是高角漫散射，其主要是卢瑟福散射，并且与由光束探测的原子的数量成比例，由它们各自的散射截面加权。
We show that the number of atoms in a small supported catalyst cluster can be estimated from the strength of electron scattering into a high angle annular detector in the STEM. The technique is related to the Z contrast methods developed by Crewe, Wall, Langmore and Isaacson. It works best for high atomic number catalyst particles when supported on low atomic number supports, such as Pt on γ‐aluminium oxide. The method is particularly useful for detecting and measuring particles in the sub‐nanometre size range where bright field images are unreliable. Unlike the Z contrast methods, a high angle annular detector is used, which avoids intensity modulations arising from Bragg reflections. The signal is mostly high angle diffuse scattering, which is predominantly Rutherford scattering, and is proportional to the number of atoms probed by the beam, weighted by their individual scattering cross‐sections.
扫描透射电子显微镜中 12 钨原子络合物的可见度和稳定性。
影响因子：
2.2
作者：
Monson,KL;Wall,JS;Hainfeld,JF
通讯作者：
Hainfeld,JF