Surfactant-templated sol–gel silica thin films bearing 5-mercapto-1-methyl-tetrazole on carbon electrode for Hg(II) detection

Abstract : Surfactant-templated mesoporous silica films functionalized with 5-mercapto-1-methyl-1-H-tetrazole (MTTZ) groups have been deposited in one step onto glassy carbon electrodes. This was made by evaporation-induced self-assembly co-condensation of triethoxysilyl-propyl-5-mercapto-1-methyl-tetrazole and tetraethoxysilane in the presence of cetyltrimethylammonium bromide. After template extraction, the film was highly porous and enabled fast mass transport of redox probes from the surrounding solution to the electrode surface. This attractive feature, associated to the easy access to MTTZ binding sites in such ordered mesoporous environment, can be exploited for effective analyte preconcentration and sensitive subsequent electrochemical detection. This has been illustrated using Hg(II) as a model analyte. Interestingly, effective Hg(II) accumulation was possible at low pH values (i.e., where other metal ions are not bonded to the hybrid material) and detection was made by anodic stripping square wave voltammetry after medium exchange to an HCl-containing solution where analyte desorption was going on. After optimization of both preconcentration and detection steps, the sensor exhibited good sensitivity, a linear response in the sub-micromolar concentration range, and a detection limit down to the nanomolar one.
Document type :
Journal articles
Complete list of metadatas

https://hal.univ-lorraine.fr/hal-01941891
Contributor : Alain Walcarius <>
Submitted on : Sunday, December 2, 2018 - 5:39:01 PM
Last modification on : Tuesday, December 4, 2018 - 8:36:53 AM

Identifiers

Collections

Citation

Alfredo Sanchez, Alain Walcarius. Surfactant-templated sol–gel silica thin films bearing 5-mercapto-1-methyl-tetrazole on carbon electrode for Hg(II) detection. Electrochimica Acta, Elsevier, 2010, 55 (13), pp.4201-4207. ⟨10.1016/j.electacta.2010.02.016⟩. ⟨hal-01941891⟩

Share

Metrics

Record views

28