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Communication Dans Un Congrès Année : 2023

A novel conductometric sensor for acetone detection prepared through electro-polymerization of pyrrole-tailed ionic liquid

Résumé

Poly(ionic liquid)s (PILs), otherwise known as polymerized ionic liquids, are a subclass of polyelectrolytes that comprises an ionic liquid (IL) species as a monomer repeating unit, connected through a polymeric backbone to form a macromolecular architecture. Since their discovery, these polymers have attracted wide attention due to their various and tunable properties. These properties include their ionic conductivity, thermal and chemical stability, and low cost. In this work, a conductometric transducer is proposed for the detection of acetone vapor. This acetone microsensor is prepared by two steps electro-polymerization. First, a thin film of polypyrrole was electrochemically deposed on interdigitated gold electrodes using cyclic voltammetry (CV) electro-polymerization followed by the electropolymerization of our synthesized pyrrole-functionalized Ionic Liquid (PyC8MImBF4). The interdigitated electrodes were fabricated by silicon technology. The polypyrrole PILs electrodeposited onto the interdigitated electrodes were widely characterized using EDX; SEM; XPS; FTIR, profilometry, CV, and Contact angle measurement. The analytical performance of the acetone microsensor was determined in gaseous ethanol, acetone, toluene, chloroform, and methanol samples, collected from the headspace above aqueous solutions of known concentration. Ethanol, acetone, toluene, chloroform, and methanol gas-sensing responses of the films were measured at room temperature, through differential conductometric measurements conducted at 10 kHz. The response time (tRes) of the sensor varies from 6 to 13 s from lower concentrations to higher concentrations. The detection limit is 2.83 v/v % in the gas phase, corresponding to 0.68 M in the liquid phase. The relative standard deviation for the same sensor is 6% for lower concentrations and 2% for higher concentrations. The acetone sensor presents 24 times lower sensitivity for ethanol, 57 times lower sensitivity for toluene, 33 times lower sensitivity for chloroform, and 10 times lower sensitivity for methanol. A detection of acetone in the headspace of a nail varnish remover sample leads to the alcohol content being in good agreement with the value given by the producer.

Domaines

Chimie
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Dates et versions

hal-04517809 , version 1 (22-03-2024)

Identifiants

  • HAL Id : hal-04517809 , version 1

Citer

Hamdi Ben Halima, Anis Madaci, Emmanuel Contal, Abdelhamid Errachid, Boris Lakard, et al.. A novel conductometric sensor for acetone detection prepared through electro-polymerization of pyrrole-tailed ionic liquid. COIL-9 Congress on Ionic Liquids, Apr 2023, Lyon, France. ⟨hal-04517809⟩
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