Electrochemical stability of self-assembled alkylphosphate monolayers on conducting metal oxides

Oktay Yildirim; M Deniz Yilmaz; David N Reinhoudt; Dave H A Blank; Guus Rijnders; Jurriaan Huskens

doi:10.1021/la200925v

Electrochemical stability of self-assembled alkylphosphate monolayers on conducting metal oxides

Langmuir. 2011 Aug 16;27(16):9890-4. doi: 10.1021/la200925v. Epub 2011 Jul 25.

Authors

Oktay Yildirim¹, M Deniz Yilmaz, David N Reinhoudt, Dave H A Blank, Guus Rijnders, Jurriaan Huskens

Affiliation

¹ Inorganic Materials Science, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands.

PMID: 21744865
DOI: 10.1021/la200925v

Abstract

Alkylphosphate self-assembled monolayers (SAMs) were prepared on Nb-doped SrTiO(3) (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.