NDLI: Influence of silanization on voltammetry at electrodes modified with silica films of controlled porosity formed by electrochemically initiated sol-gel processing

Content Provider	Springer Nature Link
Author	Cox, James A. Wiaderek, Kamila M. Mehdi, B. Layla Gudorf, Benjamin P. Ranganathan, David Zamponi, Silvia Berrettoni, Mario
Copyright Year	2011
Abstract	Silica sol-gel (SG) films with templated pores were deposited on glassy carbon (GC) electrodes by an electrochemically initiated process. Generation-4 poly(amidoamine), PAMAM, dendrimer was included in the tetraethoxysilane precursor to facilitate pore formation. The PAMAM adsorbs to the GC, which blocks SG formation at those sites on the electrode. The pore size was 10 ± 5 nm. After removal of the PAMAM, cyclic voltammetry of Fe(CN)6 3− and Ru(NH3)6 3+ at pH 6.2 showed that the residual negative charge on the silica attenuated the current for the former and increased the current for the latter, presumably by electrostatic repulsion and ion-exchange preconcentration, respectively. This premise was supported by repeating the measurements at the isoelectric point. Methylation of the silanol sites was used to eliminate the charge of the SG. At the end-capped SG, the voltammetry of Fe(CN)6 3− and Ru(NH3)6 3+ yielded currents that were independent of pH over the range 2.1 to 7.2. Circumventing the need for the silanization by using (3-glycidyloxypropyl)trimethoxysilane as the sol-gel precursor failed because the oxygen plasma treatment to remove the PAMAM attacked the organically modified sol-gel backbone. The resulting modified electrode mitigated the influence of proteins on the voltammetry of test species and stabilized functionalize nanoparticle catalysts under hydrodynamic conditions.
Starting Page	2409
Ending Page	2417
Page Count	9
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	15
Issue Number	11-12
e-ISSN	14330768
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-06-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sol-gel Silanize Pore structure Voltammetry Isoelectric point Physical Chemistry Characterization and Evaluation of Materials Condensed Matter Physics Analytical Chemistry Electrochemistry Energy Storage
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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