<i>In Situ</i> Metalorganic Deposition of Silver Nanoparticles on Gold Substrate and Square Wave Voltammetry: A Highly Efficient Combination for Nanomolar Detection of Nitrate Ions in Sea Water
Emilie Lebon,
Pierre Fau,
Maurice Comtat,
Myrtil L. Kahn,
Alix Sournia-Saquet,
Pierre Temple-Boyer,
Brigitte Dubreuil,
Philippe Behra,
Katia Fajerwerg
Affiliations
Emilie Lebon
Laboratoire de Chimie de Coordination, UPR 8241 CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
Pierre Fau
Laboratoire de Chimie de Coordination, UPR 8241 CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
Maurice Comtat
Université Paul Sabatier, UT III, 118 route de Narbonne, 31062 Toulouse Cedex 9, France
Myrtil L. Kahn
Laboratoire de Chimie de Coordination, UPR 8241 CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
Alix Sournia-Saquet
Laboratoire de Chimie de Coordination, UPR 8241 CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
Pierre Temple-Boyer
Laboratoire d’Analyse et d’Architecture des Systèmes (LAAS), 31400 Toulouse, France (CNRS)
Brigitte Dubreuil
Laboratoire de Chimie Agro-industrielle (LCA), Université de Toulouse, INRA, INPT, 31030 Toulouse Cedex 4, France
Philippe Behra
Laboratoire de Chimie Agro-industrielle (LCA), Université de Toulouse, INRA, INPT, 31030 Toulouse Cedex 4, France
Katia Fajerwerg
Laboratoire de Chimie de Coordination, UPR 8241 CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex 4, France
The electro-reduction of nitrate ions in artificial sea water was investigated at a gold substrate (EAu) functionalized by silver nanoparticles (AgNPs). These AgNPs were generated in situ on the gold substrate by the direct decomposition of the metalorganic N,N′-diisopropylacetamidinate silver precursor [Ag(Amd)] in the liquid phase. Very small and well dispersed AgNPs were deposited on the gold electrode and then used as working electrode (EAu/AgNPs). Square wave voltammetry (SWV) was successfully employed to detect nitrate ions (NO3−) with a detection limit (LOD) of 0.9 nmol∙L−1 in artificial sea water (pH = 6.0) without pre-concentration or pH adjustment.
