Grafting Control of Mainstay Terpyridine Self-Assembled Monolayers for the Preparation of Planar Silicon Surfaces with Variable Catalytic Loadings

摘要

Monolayers of terpyridine-derivatized silanes were selfassembled,nwith accurately controlled grafting densities, on single-crystalnsilicon surfaces. Complexation of the resulting terpyridine monolayersnwith Pd(OAc)2 afforded a series of catalytic surfaces covering a fullnrange of Pd loadings (0.14−0.85 nmol.cm−2) in the aim to explore theirnimpact on catalysis methodically. X-ray reflectivity (XRR), X-raynphotoelectron spectroscopy (XPS), and inductively coupled plasmanmass spectrometry (ICP-MS) were combined to afford a precise picturenof the grafting density, chemical composition, and catalyst loadings ofnthe surfaces investigated here. We report that the control of thenterpyridine density and thus the control of catalytic loadings can benachieved through a fine modification of silanization concentrations,nwhich affords surfaces with tunable catalytic activity.