期刊
CHEMELECTROCHEM
卷 4, 期 6, 页码 1470-1477出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201600872
关键词
electron transfer; hydrosilylation; self-assembled monolayers; supramolecular chemistry; surface chemistry
资金
- Netherlands Organization for Scientific Research (NWO) [022.003.001, 726.011.001]
Functionalization of silicon-based sensing devices with self-assembled receptor monolayers offers flexibility and specificity towards the requested analyte as well as the possibility of sensor reuse. As electrical sensor performance is determined by electron transfer, we functionalized H-terminated silicon substrates with beta-cyclodextrin (beta-CD) molecules to investigate the electronic coupling between these host monolayers and the substrate. A trivalent (one ferrocene and two adamantyl moieties), redox-active guest was bound to the beta-CD surface with a coverage of about 10-11 mol/cm(2) and an overall binding constant of 1.5.109 M-1. This packing density of the host monolayers on silicon is lower than that for similar beta-CD monolayers on gold. The monolayers were comparable on low-doped p-type and highly doped p++ substrates regarding their packing density and the extent of oxide formation. Nonetheless, the electron transfer was more favorable on p++ substrates, as shown by the lower values of the peak splitting and peak widths in the cyclic voltammograms. These results show that the electron-transfer rate on the host monolayers is not only determined by the composition of the monolayer, but also by the doping level of the substrate.
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