Study of chemical field effect transistors for the detection of ammonium and nitrate ions in liquid and soil phases - LAAS - Laboratoire d'Analyse et d'Architecture des Systèmes Access content directly
Journal Articles Sensors and Actuators B: Chemical Year : 2022

Study of chemical field effect transistors for the detection of ammonium and nitrate ions in liquid and soil phases

M. Marlet
  • Function : Author
C. Durieu
  • Function : Author
Jérôme Launay
Pierre Temple-Boyer

Abstract

the development of ChemFET-based sensors for the soil analysis of nitrogen-based ions is described in this work. Focusing on the fluoropolysiloxane (FPSX) polymer-based matrix, nonactin and tetradodecylammonium nitrate (TDDAN) were shown to have the best properties for the detection of ammonium NH4 + and nitrate NO3ions respectively. Thus, FPSX-based pNH4-ISFET and pNO3-ISFET microsensors exhibited good detection properties (sensitivity around 56 mV/pX in concentration ranges adapted to soil analysis) and acceptable selectivity to soil main interferent ions (K + , Na + , Ca 2+ , Cl-, H2PO4 2-, SO4 2-,…). Following, the two different ISFET sensors were applied to the in-situ soil analysis. Thus, using standard relative moistures, pH analysis in clay-silt matrixes was demonstrated on a six-month period (compatible with agriculture applications during the fertilization period). Then, experimental studies were successfully extended to the monitoring of nitrogen mineralization through pNH4 measurement, as well as to the analysis of soil nitration processes. Finally, long-term analyses were performed, showing contradictory result according to the chosen ionophore: a "zero" temporal drift on a six-month period for nonactin and PFSX-based pNH4-ISFET, and a huge temporal drift for TDDAN and PFSX-based pNO3-ones. This work paves the way for future long-term ionic analyses in soil matrix.
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Dates and versions

hal-03820153 , version 1 (18-10-2022)

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Cite

Matthieu Joly, M. Marlet, C. Durieu, Camille Bene, Jérôme Launay, et al.. Study of chemical field effect transistors for the detection of ammonium and nitrate ions in liquid and soil phases. Sensors and Actuators B: Chemical, 2022, 351, pp.130949. ⟨10.1016/j.snb.2021.130949⟩. ⟨hal-03820153⟩
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