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An original functionalization way of a gold electrode for the detection of nitrates at low level in seawater

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HAL Id: hal-01871449

https://hal.laas.fr/hal-01871449

Submitted on 10 Sep 2018

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An original functionalization way of a gold electrode for

the detection of nitrates at low level in seawater

Emilie Lebon Tailhades, Pierre Fau, Myrtil L. Kahn, Maurice Comtat, Pierre

Temple-Boyer, Philippe Behra, Brigitte Dubreuil, Katia Fajerwerg

To cite this version:

Emilie Lebon Tailhades, Pierre Fau, Myrtil L. Kahn, Maurice Comtat, Pierre Temple-Boyer, et al.. An original functionalization way of a gold electrode for the detection of nitrates at low level in seawater. 7th meeting ”Electrochemistry in nanosciences”, ElecNano 2016, May 2016, Lille, France. 1p. �hal-01871449�

(2)

An original functionalization way of a gold electrode for the detection of

nitrates at low level in seawater.

Emilie Lebon Tailhades1,5, Pierre Fau1,4, Myrtil Kahn1, Maurice Comtat2, Pierre Temple-Boyer3, Philippe Behra6, Brigitte Dubreuil6, Katia Fajerwerg1,4

1Laboratoire de Chimie de Coordination (LCC), Toulouse, France (CNRS) 2Laboratoire de Génie Chimique, Toulouse, France (CNRS/INP/UPS)

3LAAS-CNRS, Université de Toulouse, CNRS, Toulouse, France 4Université Toulouse III - Paul Sabatier, Toulouse, France

5RTRA “Sciences et Technologies pour l’Aéronautique et l’Espace”, Toulouse, France 6Laboratoire de Chimie Agro Industrielle, Toulouse (INRA/INP-ENSIACET), France

Mail: katia.fajerwerg@lcc-toulouse.fr

Determination and quantification of nitrates are considered to be essential. Indeed, they are a well-known contaminant of ground and stream water. Nitrate is an important environmental and human health analyte(1,2). In the specific area of oceanography, there is a growing demand for the ocean observations and for a better understanding of biogeochemical cycles and mixing of water masses. So, the development of simple, low-power, sensitive, selective and stable analytical in-situ sensors appears as a necessity.

The aim of this study is to develop an electrochemical sensor in order to measure nitrates at very low concentrations (nanomolar) in seawater (pH ca 6). We present here an original way for the functionalization of a gold electrode (EAu) using an organometallic silver precursor in order to obtain well dispersed silver nanoparticles (AgNP) with small sizes and narrow distribution.

The advantage of this resulting nanostructured surface combines the electrochemical properties of the gold electrode and the presence of silver nanoparticles AgNPs(3) (Figure 1). This was shown in previous works dedicated to electrodeposited Ag nanoparticles (AgNPs) in aqueous medium using a silver salt (AgNO3). The results obtained for different synthetic NO3 -solutions using the proposed AgNP-modified-gold electrode will be discussed.

Fig.1. Mechanism of electroreduction of NO3- ions on a AgNP-modified gold electrode.

References

(1) M.J. Moorcroft, J. Davis, R.G. Compton, Talanta, 2001, 54, 785. (2) M. Sohail, S.B. Adeloju, Talanta, 2016, 153, 83.

(3) K. Fajerwerg, V. Ynam, B. Chaudret, V. Garçon, D. Thouron, M. Comtat,

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