论文标题
通过扫描隧道显微镜和光谱法扫描初期烟灰的形态和电子特性
Morphology and Electronic Properties of Incipient Soot by Scanning Tunneling Microscopy and Spectroscopy
论文作者
论文摘要
烟灰成核是燃烧中烟灰形成过程中最复杂和争议的步骤之一。在这项工作中，我们使用扫描隧道显微镜（STM）和光谱法（STS）来探测初期的烟灰颗粒的形态和电子特性，该烟灰颗粒在乙烯和空气的易于刺激的层状层状前在火焰前面形成。粒子在云母基板上的原子平坦金膜上进行热采样。首次获得了初期的烟灰颗粒的高分辨率STM图像，该图像显示了低5 nm的烟灰颗粒的形态。测量高分辨率的单粒子光谱特性，确认了具有1.5至2 eV的电子带隙的初期烟灰颗粒的半导体行为，与早期的光学和光谱观测一致。
Soot nucleation is one of the most complex and debated steps of the soot formation process in combustion. In this work, we used scanning tunneling microscopy (STM) and spectroscopy (STS) to probe morphological and electronic properties of incipient soot particles formed right behind the flame front of a lightly sooting laminar premixed flame of ethylene and air. Particles were thermophoretically sampled on an atomically flat gold film on a mica substrate. High-resolution STM images of incipient soot particles were obtained for the first time showing the morphology of sub-5 nm incipient soot particles. High-resolution single-particle spectroscopic properties were measured confirming the semiconductor behavior of incipient soot particles with an electronic band gap ranging from 1.5 to 2 eV, consistent with earlier optical and spectroscopic observations.
