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2020-11-22 - Colloque/Présentation - communication orale - Anglais - 23 page(s)

Luo Yifan , Ly Ahmadou, Debliquy Marc , Lahem Driss, Zhang Chao, "A novel low-concentration isopropanol gas sensor based on Fe-doped ZnO nanoneedles" in AllSensors 2020 (DigitalWorld 2020), Valencia, Espagne, 2020

  • Codes CREF : Généralités (DI0000)
  • Unités de recherche UMONS : Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)

Abstract(s) :

(Anglais) The detection of lung cancer via the analysis of volatile organic compounds (VOCs) in exhaled breath has attracted a lot of attention as it is simple and non-invasive for the patient. Among the numerous VOCs existed in the breath, isopropanol is believed to be an important biomarker that can help to discriminate between healthy and unhealthy persons. In this work, a highly sensitive Fe doped ZnO nanoneedles based gas sensor was studied for detection at low concentrations (below 10 ppm). The pure and Fe doped ZnO were synthesized via a hydrothermal method and spray-coated onto an alumina substrates equipped with a pair of gold interdigitated electrodes. The morphologies of the sensing layers were characterized by SEM, while the phase structure and composition were determined by XRD. The sensing properties of (pure and Fe doped ZnO) were investigated under different temperatures and concentrations. It is found that Fe doping significantly increased the sensing performance of ZnO nanoneedles. The optimal doping concentration of Fe is 5 at% for isopropanol detection and the optimal working temperature is 275oC. The sensor showed a high response to 250 ppb isopropanol, together with high stability under different humidity levels.


Mots-clés :
  • (Anglais) ZnO; gas sensor; isopropanol; sensing mechanism; lung cancer