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A New Sensor with Increased Lifetime Based on a Mixed Diazonium Thick Film/Gold Nanoparticles Interface for Hg(II) Trace Detection
Author(s) -
Fezai Fatma,
Séverac Childérick,
Gros Pierre,
Meireles Martine,
Evrard David
Publication year - 2020
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201900434
Subject(s) - thiophenol , nanoparticle , colloidal gold , materials science , anodic stripping voltammetry , electrode , surface modification , electrochemistry , cyclic voltammetry , stripping (fiber) , trace amounts , anodic aluminum oxide , glassy carbon , analytical chemistry (journal) , nanotechnology , chemical engineering , chemistry , fabrication , organic chemistry , composite material , medicine , alternative medicine , pathology , engineering
This work describes a novel strategy for surface functionalization, the aim of which is to significantly increase the lifetime of an electrochemical sensor dedicated to Hg(II) trace determination. In order to tailor stable mixed organic/inorganic interfaces, gold nanoparticles were electrodeposited onto a glassy carbon electrode previously functionalized by a thick 4‐thiophenol diazonium film, which affords a good anchoring to the nanoparticles. AFM and FEG‐SEM were used to characterize the film thickness and the nanoparticles average size and density, respectively. By using square wave anodic stripping voltammetry, the sensor exhibited a linear response between 1 and 10 nM Hg(II) and a normalized sensitivity 0.03 μA nM −1 min −1 . Compared to previous works, the storage lifetime of the interface was at least three times longer, being more than three weeks.