Electrochemical Stability of Self-Assembled Alkylphosphate Monolayers on Conducting Metal Oxides
Author(s):
Oktay Yildirim, M. Deniz Yilmaz, David N. Reinhoudt, Dave H. A. Blank, Guus Rijnders, Jurriaan Huskens
Journal:
Langmuir
Year:
2011
Volume:
27
Pages
9890-9894
DOI:
10.1021/la200925v
Abstract:
Alkylphosphate self-assembled monolayers (SAMs) were prepared on Nb-doped SrTiO3 (Nb–STO) conducting metal oxide substrates. Unlike thiols on gold, the alkylphosphate SAMs on Nb–STO exhibited an electrochemical stability over a wide voltage range from −2 to 2 V. Cyclic voltammetry showed that the SAM modification inhibited the electrochemical activity of the underlying conducting substrate with an efficiency dependent on the chain length. Impedance spectroscopy showed that SAM-modified Nb–STO substrates have a significantly higher resistance than bare substrates.