基于 SiO2/GO/PVA 的水凝胶传感器的制备及其在快速灵敏检测 NH3 中的应用

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2024-11-09 DOI:10.1016/j.snb.2024.136885

Xueqin Du , Shuang Gu , Xuemei Wang , Shang Zhang , Bin Zhang , Guoming Yu , Zhenhe Wang , Wei Chen , Qiuhong Li

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引用次数: 0

摘要

气体传感器因其微型化、低功耗和高可靠性而备受关注。本文利用二氧化硅（SiO2）、多孔氧化石墨烯（GO）和聚乙烯醇（PVA）制备了对 NH3 具有高传感性能的水凝胶薄膜。通过扫描电子显微镜（SEM）、傅立叶变换红外光谱（FT-IR）和比表面积分析对水凝胶的形态和结构进行了表征。与基于平面 GO 片材的传统气体传感器相比，所制备的基于多孔 SiO2/GO/PVA 的水凝胶传感器可用于检测低浓度（10 ppm）和 10-1000 ppm 宽范围的 NH3。同时，还实现了 118% 的高响应率和超快恢复（12 秒）。最后，提出了基于 SiO2/GO/PVA 的水凝胶薄膜的传感机制：NH3 通过氢键吸附在薄膜表面，然后与薄膜表面的氧负离子反应生成氮氧化物。脱气后，氧气再次被吸附在薄膜表面，形成氧负离子。此外，薄膜还能监测 0-7 天内鱼的新鲜度，其中电阻变化与 TVB-N 的相关性高达 0.975。这项工作证明了基于多孔 SiO2/GO/PVA 的水凝胶薄膜在改善气敏性能方面的有效性，为食品新鲜度检测、污染跟踪和有害物质监测等提供了可行的解决方案。

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The preparation of SiO2/GO/PVA based hydrogel sensor and its application for rapid and sensitive detection of NH3

Gas sensors have received significant interest due to their miniaturization, low power consumption and high reliability. In this paper, hydrogel film with high sensing properties toward NH₃ were prepared using silicon dioxide (SiO₂), porous graphene oxide (GO) and polyvinyl alcohol (PVA). The morphology and structure of hydrogel were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectra (FT-IR) and specific surface area analysis. Compared with the conventional gas sensors based on planar GO sheets, the prepared porous SiO₂/GO/PVA based hydrogel sensor could be used to detect NH₃ with low concentration (10 ppm) and wide range of 10–1000 ppm. At the same time, a high response rate of 118 % and an ultra-fast recovery (12 s) were achieved. Finally, a sensing mechanism for SiO₂/GO/PVA based hydrogel film was proposed: NH₃ was adsorbed onto the surface of the film through hydrogen bonding and then reacted with the oxygen negative ions on the surface of the film to form nitrogen oxides. After degassing, oxygen was adsorbed on the surface of the film again to form oxygen negative ions. In addition, the film could monitor the freshness of fish over a period of 0–7 days, where the correlation between the resistance change and TVB-N was as high as 0.975. This work demonstrates the effectiveness of porous SiO₂/GO/PVA based hydrogel film in improving gas-sensitive properties, providing a viable solution for food freshness detection, contamination tracking, and hazardous substances monitoring, etc.

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.