Feasibility verification for using flexible spiral MWCNTs/ZSM-5/TOCNFs composites to measure humidity and distance

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-09-25 DOI:10.1016/j.snb.2025.138835

Luheng Wang, Xisi Long, Li Xu, Maoyuan Nan

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Abstract

This study develops a dual-functional flexible spiral element based on multi-walled carbon nanotubes/ ZSM-5/2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)- oxidized cellulose nanofibers (MWCNTs/ZSM-5/TOCNFs) composites for humidity-distance detection in critical equipment interlayers, fabricated via mask-assisted spray deposition. Through systematic optimization of component ratio (MWCNTs: 20 mg, ZSM-5: 200/400/800 mg, TOCNFs: 0.125/0.25/0.5/1 mg), the optimal element M₂₀Z₄₀₀T_0.25 (MWCNTs/ZSM-5/TOCNFs=20:400:0.25) demonstrates a great humidity resistance response of 2520.15%/90% RH with a short response/recovery time of 6.5/15 s (43-90% RH), owing to the exceptional tri-phase synergy: MWCNTs establish conductive pathways, TOCNFs enable humidity- selective surface interactions, and ZSM-5 sieves provide nanochannels for rapid diffusion of water molecules. The spiral architecture enables impedance to be sensitive to the distance between the element and the target (copper). As temperature increases from 15℃ to 35℃, the humidity resistance response rises from 1486.20%/90% RH to 3189.55%/90% RH, and the distance sensitivity (0-2.5 mm, 40~90% RH) of impedance amplitude reduces from 9.537%·mm^-1 to 3.059%·mm^-1. A measuring strategy is proposed based on humidity-exclusive resistance and humidity/distance-coupled impedance. This work offers a promising solution for health monitoring of key facilities.

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使用柔性螺旋MWCNTs/ZSM-5/TOCNFs复合材料测量湿度和距离的可行性验证

本研究开发了一种基于多壁碳纳米管/ZSM-5/ 2,2,6,6-四甲基哌啶-1-氧基（TEMPO）氧化纤维素纳米纤维（MWCNTs/ZSM-5/TOCNFs）复合材料的双功能柔性螺旋元件，用于关键设备夹层的湿度距离检测，该复合材料通过掩膜辅助喷雾沉积制备。通过对组分配比（MWCNTs: 20 mg, ZSM-5: 200/400/800 mg, TOCNFs: 0.125/0.25/0.5/1 mg）的系统优化，最优元件M20Z400T0.25 （MWCNTs/ZSM-5/TOCNFs=20:40 00:0.25）具有2520.15%/90% RH的高抗湿响应，响应/恢复时间为6.5/15 s (43-90% RH)，这是由于优异的三相协同作用。MWCNTs建立导电途径，TOCNFs实现湿度选择性表面相互作用，ZSM-5筛子为水分子的快速扩散提供纳米通道。螺旋结构使阻抗对元件和目标（铜）之间的距离敏感。当温度从15℃升高到35℃时，湿阻响应从1486.20%/90% RH升高到3189.55%/90% RH，阻抗幅值的距离灵敏度（0 ~ 2.5 mm, 40~90% RH）从9.537%·mm-1降低到3.059%·mm-1。提出了一种基于排湿电阻和湿度/距离耦合阻抗的测量策略。这项工作为关键设施的健康监测提供了一个有前景的解决方案。

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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.