Critical Effect of Film Thickness on Preconcentration Electroanalysis with Oriented Mesoporous Silica Modified Electrodes

Electrogenerated silica thin films exhibiting a regular hexagonal packing of vertically‐aligned mesopore channels are promising for preconcentration electroanalysis. This work demonstrates the critical role of film thickness on their sensing performance using paraquat as a model analyte, based on me...

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Bibliographic Details
Published in:Electroanalysis (New York, N.Y.) N.Y.), 2019-02, Vol.31 (2), p.202-207
Main Authors: Nasir, Tauqir, Vodolazkaya, Natalya A., Herzog, Grégoire, Walcarius, Alain
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemical Sciences
Mesoporous silica
or physical chemistry
Paraquat
Sensitivity
Theoretical and
Thin film
Voltammetric detection
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Summary:Electrogenerated silica thin films exhibiting a regular hexagonal packing of vertically‐aligned mesopore channels are promising for preconcentration electroanalysis. This work demonstrates the critical role of film thickness on their sensing performance using paraquat as a model analyte, based on mesoporous silica films prepared by electrochemically assisted self‐assembly performed for various deposition times. Films prepared with too short synthesis times (15 s deposition times) as a result of less electrochemically accessible paraquat accumulated far away from the electrode surface and restricted mass transport through the whole film thickness. These limitations were also confirmed on the basis of multi‐layered mesoporous silica films, suggesting a behavior that might be typical for other types of film‐modified electrodes.
ISSN:1040-0397
1521-4109
DOI:10.1002/elan.201800533