Colloids and Surfaces A 538 (2018) 488–493 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Research Paper Self-assembled monolayers of N-heterocyclic carbene on gold: Stability under ultrasonic circumstance and computational study Sijun Qi, Qi Ma, Xiaohong He, Yongming Tang School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, PR China GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: Self-assembled monolayers (SAMs) of N-heterocyclic carbene (NHC) are built up on gold substrate. N-Heterocyclic carbene Electrochemical impedance spectroscopy (EIS) tests show that the NHC-based SAMs exhibit high stability under Self-assembled monolayers ultrasonic circumstance, over 90% of NHC molecules being retained at gold surfaces after ultrasonic treatment of Impedance spectroscopy 10 min in water. Computations of density functional theory (DFT) demonstrate the preferential adsorption of Stability NHC molecules at atop sites of Au (1 1 1) plane, and the strong interaction between NHC molecules and Au Density functional computations surfaces is attributed to the bonding between 2-position C atoms and Au atoms by the hybridization of the C 2p Adsorption orbitals with the Au 5d and 6s orbitals. 1. Introduction both organic and aqueous solutions . In contrast, physical stability of SAMs was paid little
Geoderma – Elsevier
Published: Feb 15, 2019
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