Highly sensitive ammonia resistive sensor based on electrospun V₂O₅ fibers

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• 作者：V. Modafferi^a  ; [Author Vitae] ; G. Panzera^a  ; [Author Vitae] ; A. Donato^a  ; [Author Vitae] ; P.L. Antonucci^a  ; [Author Vitae] ; C. Cannilla^b  ; [Author Vitae] ; N. Donato^c  ; [Author Vitae] ; D. Spadaro^d  ; [Author Vitae] ; G. Neri^d ; ^{neri@ingegneria.unime.it}  ; [Author Vitae]
• 关键词：Electrospinning ; Sol&ndash ; gel route ; V2O5 ; Ammonia sensor
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2012
• 期刊代码：161_09254005
• 类别：et
• 出版时间：1 March, 2012
• 卷：163
• 期：1
• 页码：61-68
• 文件大小：1114 K

摘要

A simple sol-gel based electrospinning method has been applied for the synthesis of vanadium oxide/polyvinyl acetate (V₂O₅/PVAC) fibers for gas sensing applications. The pure phase V₂O₅ has been subsequently obtained by removing the polymer phase via annealing of the composite fibers in air. The as-spun V₂O₅/PVAC composite fibers and related products of annealing have been widely studied to characterize their morphological and microstructural properties by TG-DSC, XRD, DRIFT and SEM investigations.

The application of the produced V₂O₅ fibers as high performance ammonia resistive sensors has been demonstrated. Reversible electrical changes have been observed by exposing V₂O₅ fibers deposited on interdigited electrodes to sub-ppm concentrations of ammonia gas. The fabricated V₂O₅ sensor has shown the highest response to ammonia gas at 200-250 掳C, with a response and recovery time of about 50 and 350 s, respectively. A linear dependence of the response value on the ammonia concentration has been observed in the range of 0.85-8.5 ppm, with an estimated lower detection limit of about 100 ppb.