Determining orientational structure of diamondoid thiols attached to silver using near-edge X-ray absorption fine structure spectroscopy

作者：Willey Trevor M^*; Lee Jonathan R I; Fabbri Jason D; Wang Dongbo; Nielsen Michael H; Randel Jason C; Schreiner Peter R; Fokin Andrey A; Tkachenko Boryslav A; Fokina Natalie A; Dahl Jeremy E P; Carlson Robert M K; Terminello Louis J; Melosh Nicholas A; van Buuren Tony

来源：Journal of Electron Spectroscopy and Related Phenomena, 2009, 172(1-3): 69-77.

DOI：10.1016/j.elspec.2009.03.011

• NEXAFS
• Self-assembled monolayers
• Diamondoids
• Thiols
• Molecular electronics
• Nanodiamond

Near-edge X-ray absorption fine structure spectroscopy (NEXAFS) is a powerful tool for determination of molecular orientation in self-assembled monolayers and other surface-attached molecules. A general framework for using NEXAFS to simultaneously determine molecular tilt and twist of rigid molecules attached to surfaces is presented. This framework is applied to self-assembled monolayers of higher diamondoids, hydrocarbon molecules with cubic-diamond-cage structures. Diamondoid monolayers chemisorbed on metal substrates are known to exhibit interesting electronic and surface properties. This work compares molecular orientation in monolayers prepared on silver substrates using two different thiol positional isomers of [121]tetramantane, and thiols derived from two different pentamantane structural isomers, [1212]pentamantane and [1(2,3)4]pentamantane. The observed differences in monolayer structure demonstrate the utility and limitations of NEXAFS spectroscopy and the framework. The results also demonstrate the ability to control diamondoid assembly, in particular the molecular orientational structure, providing a flexible platform for the modification of surface properties with this exciting new class of nanodiamond materials.

• 出版日期2009-5
• 单位Virginia Tech; 美国弗吉尼亚理工大学(Virginia Tech)