质谱法和尺寸选择的 Au 纳米团簇表面上观察到的金原子吸附体的动力学。

Mass spectrometry and dynamics of gold adatoms observed on the surface of size-selected Au nanoclusters.

机构信息

Nanoscale Physics Research Laboratory, School of Physics and Astronomy, University of Birmingham, B15 2TT, United Kingdom.

出版信息

Nano Lett. 2012 Jan 11;12(1):91-5. doi: 10.1021/nl2037112. Epub 2011 Dec 8.

DOI:10.1021/nl2037112

PMID:22126627

Abstract

We report the imaging, mass spectrum, and dynamical behavior of adatoms and small clusters observed on the surface facets of size-selected, truncated octahedral gold clusters, Au(N) (N = 923 ± 23), via aberration-corrected scanning transmission electron microscopy. Our quantitative atom counting measurements show that most (~70%) of the species on the surface are single Au adatoms. Such species are now proposed as key elements of the atomic structure of both monolayer-protected nanoclusters (nanoparticles) and self-assembled monolayers and may also play a role in gold nanocatalysis. The adatoms are found on both {100} and {111} facets with similar probabilities.

摘要

我们通过校正像差的扫描透射电子显微镜，报告了在尺寸选择的截断八面体金纳米团簇 Au(N)（N = 923 ± 23）的表面晶面上观察到的 adatoms 和小团簇的成像、质谱和动力学行为。我们的定量原子计数测量表明，表面上的大多数（约 70%）物种是单个 Au adatoms。这些物种现在被提议作为单层保护纳米团簇（纳米颗粒）和自组装单层原子结构的关键元素，并且可能在金纳米催化中也发挥作用。在{100}和{111}面，adatom 的出现概率相似。