Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, PO Box 217, 7500AE Enschede, The Netherlands.
Ultramicroscopy. 2013 Dec;135:89-94. doi: 10.1016/j.ultramic.2013.07.010. Epub 2013 Jul 19.
Nano-particles are of great interest in fundamental and applied research. However, their accurate visualization is often difficult and the interpretation of the obtained images can be complicated. We present a comparative scanning electron microscopy and helium ion microscopy study of cetyltrimethylammonium-bromide (CTAB) coated gold nano-rods. Using both methods we show how the gold core as well as the surrounding thin CTAB shell can selectively be visualized. This allows for a quantitative determination of the dimensions of the gold core or the CTAB shell. The obtained CTAB shell thickness of 1.0 nm-1.5 nm is in excellent agreement with earlier results using more demanding and reciprocal space techniques.
纳米粒子在基础研究和应用研究中都具有重要意义。然而，它们的精确可视化通常很困难，并且获得的图像的解释可能很复杂。我们对十六烷基三甲基溴化铵（CTAB）包覆的金纳米棒进行了扫描电子显微镜和氦离子显微镜的比较研究。使用这两种方法，我们展示了如何选择性地观察金核以及周围的薄 CTAB 壳。这允许定量确定金核或 CTAB 壳的尺寸。获得的 CTAB 壳厚度为 1.0nm-1.5nm，与使用更苛刻的倒空间技术得到的早期结果非常吻合。
