期刊
CHEMPHYSCHEM
卷 14, 期 14, 页码 3248-3254出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201300581
关键词
carbon; electron microscopy; helium-ion microscopy; imaging; nanoparticles
资金
- Combustion Energy Frontier Research Center (CEFRC), an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001198]
For the first time, nascent soot particles are probed by using helium-ion microscopy (HIM). HIM is a technique that is similar to scanning electron microscopy (SEM) but it can achieve higher contrast and improved surface sensitivity, especially for carbonaceous materials. The HIM microscope yields images with a high contrast, which allows for the unambiguous recognition of smaller nascent soot particles than those observed in previous transmission electron microscopy studies. The results indicate that HIM is ideal for rapid and reliable probing of the morphology of nascent soot, with surface details visible down to approximately 5 nm, and particles as small as 2 nm are detectable. The results also show that nascent soot is structurally and chemically inhomogeneous, and even the smallest particles can have shapes that deviate from a perfect sphere.
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