Fluorinated polyaniline-based sensors with enhanced NH3 sensitivity

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Synthetic Metals Pub Date : 2024-07-10 DOI:10.1016/j.synthmet.2024.117695

Aihemaiti Kayishaer , Caroline Duc , Claire Magnenet , Boris Lakard , Hamdi Ben Halima , Nathalie Redon , Sophie Lakard

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Abstract

Poly(2-fluoroaniline) films were prepared by electrochemical oxidation of 2-fluoroaniline in perchloric acid solutions. These films had a characteristic globular structure, but low thickness and conductivity. For these reasons, alternative polymer films were prepared from electrolytic solutions with different aniline:2-fluoroaniline ratios. The physicochemical properties of these polymer films strongly evolved with the ratio since they were thicker and more conductive when the proportion of aniline increased while their morphology also varied significantly. The electrodeposited polymer films were then used as sensitive layers of gas sensors for ammonia detection. The addition of 2-fluoroaniline improved the performance characteristics of gas sensors for the detection of ammonia at room temperature and the poly(aniline/2-fluoroaniline)-based sensors responded to ammonia gas with good repeatability, good sensitivity (0.44 %/ppb), a very low detection limit (4 ppb), and a low dependence on humidity variations.

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基于氟化聚苯胺的传感器具有更高的 NH3 灵敏度

通过在高氯酸溶液中对 2-氟苯胺进行电化学氧化，制备出了聚 2-氟苯胺薄膜。这些薄膜具有独特的球状结构，但厚度和导电性较低。由于这些原因，我们用不同的苯胺：2-氟苯胺比例的电解溶液制备了替代聚合物薄膜。这些聚合物薄膜的物理化学特性随比例的变化而发生了很大的变化，因为苯胺比例增加时，薄膜更厚，导电性更强，同时它们的形态也发生了很大的变化。电沉积聚合物薄膜随后被用作氨气检测气体传感器的敏感层。添加 2-氟苯胺改善了气体传感器在室温下检测氨气的性能特征，基于聚（苯胺/2-氟苯胺）的传感器对氨气的响应具有良好的重复性、灵敏度（0.44 %/ppb）、极低的检测限（4 ppb）以及对湿度变化的低依赖性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Synthetic Metals 工程技术-材料科学：综合

CiteScore

8.30

自引率

4.50%

发文量

189

审稿时长

33 days

期刊介绍： This journal is an international medium for the rapid publication of original research papers, short communications and subject reviews dealing with research on and applications of electronic polymers and electronic molecular materials including novel carbon architectures. These functional materials have the properties of metals, semiconductors or magnets and are distinguishable from elemental and alloy/binary metals, semiconductors and magnets.