揭示正十二烷硫醇自组装单层在 Au(100) 和 Au(111) 上的辐射损伤：了解 Au 纳米颗粒定向附着的先决条件,The Journal of Physical Chemistry C

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揭示正十二烷硫醇自组装单层在 Au(100) 和 Au(111) 上的辐射损伤：了解 Au 纳米颗粒定向附着的先决条件
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-12-03 , DOI: 10.1021/acs.jpcc.1c08444
Natalia D. Aagaard ₁ , Eugenia Zelaya ₁ , Mariano H. Fonticelli ₂ , Julio C. Azcárate ₁

Affiliation

我们对 Au(100) 和 Au(111) 上正十二烷硫醇自组装单层的电子诱导降解进行了定量 X 射线光电子能谱研究。这项研究的动机是缺乏对n的定向依恋的机械解释-十二烷硫醇保护的纳米粒子在透射电子显微镜成像过程中暴露于辐射。这些纳米粒子的聚结优先通过（100）面的相遇发生。可以假设从 Au(100) 面解吸硫醇盐比在 Au(111) 上解吸更快，这将克服 (100) 金属表面遇到的空间位阻。尽管如此，我们发现有机材料从两个单晶表面解吸的速率和延伸率相当，尽管这些表面上最丰富的破坏性产物是不同的。此外，虽然 RS-R' 在 Au(111) 上占优势，而 RS-SR 在 Au(100) 上形成，但衍生自十二烷硫醇的完整部分是两种 SAM 的主要解吸产物。此外，

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Unraveling the Radiation Damage of n-Dodecanethiol Self-Assembled Monolayers on Au(100) and Au(111): A Prerequisite to Understand the Oriented Attachment of Au Nanoparticles

We present a quantitative X-ray photoelectron spectroscopy study on the electron-induced degradation of self-assembled monolayers of n-dodecanethiol on Au(100) and Au(111). This study is motivated by the lack of mechanistic explanations of the oriented attachment of n-dodecanethiolate-protected nanoparticles exposed to irradiation during imaging by transmission electron microscopy. The coalescence of these nanoparticles preferentially occurs through the encounter of the (100) faces. It could be hypothesized that thiolate desorption from the Au(100) faces is faster than that on Au(111), which would overcome the steric hindrance for the encounter of the (100) metallic surfaces. Nevertheless, we found that the organic material desorbs at comparable rates and extension from both single-crystalline surfaces, despite the fact that the most abundant damaging products are different on these surfaces. Furthermore, although RS–R′ prevails on Au(111) while RS–SR is formed on Au(100), complete moieties derived from dodecanethiolate are the main desorption products from both SAMs. In addition, we provided arguments based on the reaction mechanism to describe the cross-linking of hydrocarbon chains and to explain why sulfur-containing species desorbs at the same rate from both single-crystalline surfaces.

更新日期：2021-12-16

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