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首页> 外文期刊>RSC Advances >The surface chemical composition effect of a polyacrylic acid/polyvinyl alcohol nanofiber/quartz crystal microbalance sensor on ammonia sensing behavior
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The surface chemical composition effect of a polyacrylic acid/polyvinyl alcohol nanofiber/quartz crystal microbalance sensor on ammonia sensing behavior

机译：聚丙烯酸/聚乙烯醇纳米纤维/石英晶体微天平传感器的表面化学成分对氨感测行为的影响

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摘要

Polyacrylic acid (PAA)/polyvinyl alcohol (PVA)-based quartz crystal microbalance (QCM) ammonia sensors were fabricated by depositing composite PAA/PVA nanofibrous substrates onto QCM gold electrodes. Morphological analysis of the PAA/PVA substrates revealed a homogenous smooth surface and similar specific surface areas. X-ray photoelectron spectroscopy results indicated their distinct chemical properties with different carboxyl group contents on the surface. The ammonia sensing tests demonstrated the significant effect of the surface chemical characteristics on ammonia-sensing sensitivity, and the sensing process was proven to be derive from a monolayer adsorption mechanism. Because of the inherent high specific surface areas (SSAs) and three-dimensional porous architecture, the prepared PAA/PVA nanofiber-based QCM sensors exhibited ultrahigh sensitivity (100 ppb) and rapid response (several seconds) with good selectivity and repeatability in terms of ammonia detection.
机译：通过将复合PAA / PVA纳米纤维基材沉积到QCM金电极上，制造了基于聚丙烯酸（PAA）/聚乙烯醇（PVA）的石英晶体微天平（QCM）氨传感器。 PAA / PVA基材的形态分析显示出均匀的光滑表面和相似的比表面积。 X射线光电子能谱分析结果表明它们具有不同的化学性质，表面具有不同的羧基含量。氨气传感测试证明了表面化学特性对氨气传感灵敏度的显着影响，并且传感过程被证明源自单层吸附机制。由于固有的高比表面积（SSA）和三维多孔结构，所制备的基于PAA / PVA纳米纤维的QCM传感器具有超高灵敏度（100 ppb）和快速响应（几秒钟），具有良好的选择性和可重复性。氨气检测。

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