A New Sensor with Increased Lifetime Based on a Mixed Diazonium Thick Film/Gold Nanoparticles Interface for Hg(II) Trace Detection

• DOI: 10.1002/elan.201900434
• Publication Date: 2019-10-04T09:38:05Z
• Authors: Fatma Fezai; Childérick Séverac; Pierre Gros; Martine Meireles; David Evrard
• Keywords: Thiophenol; Anodic Stripping Voltammetry; Surface Modification; Stripping (fiber); Trace Amounts; Anodic Aluminum Oxide; Glassy carbon

Abstract This work describes a novel strategy for surface functionalization, the aim of which is to significantly increase lifetime an electrochemical sensor dedicated Hg(II) trace determination. In order tailor stable mixed organic/inorganic interfaces, gold nanoparticles were electrodeposited onto glassy carbon electrode previously functionalized by thick 4‐thiophenol diazonium film, affords good anchoring nanoparticles. AFM and FEG‐SEM used characterize film thickness average size density, respectively. By using square wave anodic stripping voltammetry, exhibited linear response between 1 10 nM normalized sensitivity 0.03 μA −1 min . Compared previous works, storage interface was at least three times longer, being more than weeks.