Fabrication of Highly Sensitive Gas Sensor Based on Au Functionalized WO 3 Composite Nanofibers by Electrospinning

Authors
Xiaojiao Yang, Vincent Salles, Yusuf Valentino Kaneti, Minsu Liu, Mathieu Maillard, Catherine Journet, Xuchuan Jiang, Arnaud Brioude


Lab
Laboratoire des Multimatériaux et Interfaces (UMR CNRS 5615 Université of Lyon, LYON 1), Villeurbanne, France

Journal
Sensors and Actuators B: Chemical

Abstract
A highly sensitive and selective gas-sensing material based on gold (Au)-functionalized tungsten oxide (WO3) composite nanofibers (NFs) has been fabricated under mild conditions by electrospinning (ES). Au nanoparticles (NPs)-decorated WO3 composite NFs were obtained by ES of the tungsten precursor (ammonium metatungstate hydrate) (AMT) and polyvinyl alcohol (PVA) solution followed by a two-step annealing treatment. The chemical and structural characterizations of the resulting composite nanofibers have been performed with various techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and inductively coupled plasma optical emission spectrometry (ICP-OES). The gas-sensing properties of the WO3–Au composite NFs with different Au contents (0.01 M and 0.1 M) toward volatile organic compounds (VOCs) (such as n-butanol) have been studied. A discussion concerning the role of Au content and the operating temperature is given to optimize the sensitivity, the dynamic response–recovery behaviors and consequently the efficiency of the WO3–Au composite sensor.

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