Abstract
Chemical sensing based on semiconducting metal oxides has been largely proposed for acetone sensing, although some major technical challenges such as high operating temperature still remain unsolved. This work presents the development of an electrochemical sensor based on nanostructured PANI/cellulose/WO3composite for acetone detection at room temperature. The synthesized materials for sensor preparation were polyaniline (PANI) with a conductivity of 13.9 S/cm and tungsten trioxide (WO3) in monoclinic phase doped with cellulose as carbon source. The synthesized materials were characterized by high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), cyclic voltammetry (CV), and Raman spectroscopy. The composite was applied for acetone detection in the range of 0 to 100 ppmv at room temperature with electrochemical impedance spectroscopy (EIS) for monitoring resistance changes proportional to acetone concentration. The developed sensor achieved a calculated limit of detection of 10 ppm andR2of 0.99415 with a RSD of 5% (n=3) at room temperature. According to these results, the developed sensor is suitable for acetone sensing at room temperatures without the major shortcomings of larger systems required by high operating temperatures.
Highlights
Acetone is a gaseous organic compound widely used as solvent in academic and industrial settings with practical importance for fields such as occupational safety and clinical diagnosis
The synthesized materials were characterized by high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), cyclic voltammetry (CV), and Raman spectroscopy
The composite was applied for acetone detection in the range of 0 to 100 ppmv at room temperature with electrochemical impedance spectroscopy (EIS) for monitoring resistance changes proportional to acetone concentration
Summary
Acetone is a gaseous organic compound widely used as solvent in academic and industrial settings with practical importance for fields such as occupational safety and clinical diagnosis. Since acetone acts as a reducing gas, detection by sensors such as ZnO [7], In2O3 [8], and SnO2 [9] has been previously studied but among SMO materials WO3 has been proposed as the most suitable material for acetone sensing [10]. Alternatives for room temperature operation have been studied, such as the preparation of SMO composites with conductive polymeric matrices of polyaniline (PANI). In this sense, room temperature sensors for detection of ammonia have been designed with nanocomposite thin film of PANI/Cu nanoparticles and PANI/α–Fe2O3 [13, 14]. A nanocomposite of PANI and WO3 doped with carbon derived from cellulose (C–WO3) was proposed for acetone detection at room temperature. Sensibility of the fabricated device trough acetone was evaluated by EIS allowing detection at room temperature
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