Schenk Marina, Lieb Sydnie, Vieker Henning, Beyer André, Gölzhäuser Armin, Wang Hai, Kohse-Höinghaus Katharina
Department of Chemistry, Bielefeld University, Universitätsstraße 25, 33615 Bielefeld (Germany).
Chemphyschem. 2013 Oct 7;14(14):3248-54. doi: 10.1002/cphc.201300581. Epub 2013 Aug 15.
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.
首次使用氦离子显微镜（HIM）对初生烟灰颗粒进行探测。氦离子显微镜是一种类似于扫描电子显微镜（SEM）的技术，但它可以实现更高的对比度和更好的表面灵敏度，特别是对于含碳材料。氦离子显微镜产生的图像具有高对比度，这使得能够明确识别比以前的透射电子显微镜研究中观察到的更小的初生烟灰颗粒。结果表明，氦离子显微镜是快速可靠地探测初生烟灰形态的理想工具，表面细节可见至约5纳米，甚至小至2纳米的颗粒也可检测到。结果还表明，初生烟灰在结构和化学上是不均匀的，即使是最小的颗粒也可能具有偏离完美球体的形状。
