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基于聚环氧乙烷/氧化铜/多壁碳纳米管复合纳米纤维的高灵敏度湿度传感器

Highly Sensitive Humidity Sensors Based on Polyethylene Oxide/CuO/Multi Walled Carbon Nanotubes Composite Nanofibers.

作者信息

Ahmad Waqas, Jabbar Bushra, Ahmad Imtiaz, Mohamed Jan Badrul, Stylianakis Minas M, Kenanakis George, Ikram Rabia

机构信息

Institute of Chemical Sciences, University of Peshawar, Khyber Pukhtunkhwa 25120, Pakistan.

Department of Chemical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia.

出版信息

Materials (Basel). 2021 Feb 22;14(4):1037. doi: 10.3390/ma14041037.

DOI:10.3390/ma14041037
PMID:33671689
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7927036/
Abstract

Polymer composites are favorite materials for sensing applications due to their low cost and easy fabrication. In the current study, composite nanofibers consisting of polyethylene oxide (PEO), oxidized multi-walled carbon nanotubes (MWCNT) and copper oxide (CuO) nanoparticles with 1% and 3% of fillers (i.e., PEO-CuO-MWCNT: 1%, and PEO-CuO-MWCNT: 3%) were successfully developed through electrospinning for humidity sensing applications. The composite nanofibers were characterized by FTIR, XRD, SEM and EDX analysis. Firstly, they were loaded on an interdigitated electrode (IDE), and then the humidity sensing efficiency was investigated through a digital LCR meter (E4980) at different frequencies (100 Hz-1 MHz), as well as the percentage of relative humidity (RH). The results indicated that the composite nanofibers containing 1% and 3% MWCNT, combined with CuO in PEO polymer matrix, showed potent resistive and capacitive response along with high sensitivity to humidity at room temperature in an RH range of 30-90%. More specifically, the PEO-CuO-MWCNT: 1% nanocomposite displayed a resistive rapid response time within 3 s and a long recovery time of 22 s, while the PEO-CuO-MWCNT: 3% one exhibited 20 s and 11 s between the same RH range, respectively.

摘要

聚合物复合材料因其低成本和易于制造而成为传感应用的理想材料。在本研究中，通过静电纺丝成功制备了由聚环氧乙烷（PEO）、氧化多壁碳纳米管（MWCNT）和氧化铜（CuO）纳米颗粒组成的复合纳米纤维，其中填料含量分别为1%和3%（即PEO-CuO-MWCNT: 1%和PEO-CuO-MWCNT: 3%），用于湿度传感应用。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、扫描电子显微镜（SEM）和能谱分析（EDX）对复合纳米纤维进行了表征。首先，将它们加载到叉指电极（IDE）上，然后通过数字LCR测试仪（E4980）在不同频率（100 Hz - 1 MHz）以及相对湿度（RH）百分比下研究湿度传感效率。结果表明，在PEO聚合物基体中含有1%和3% MWCNT并与CuO结合的复合纳米纤维，在室温下30 - 90%的RH范围内显示出强大的电阻和电容响应以及对湿度的高灵敏度。更具体地说，PEO-CuO-MWCNT: 1%纳米复合材料在3 s内显示出电阻快速响应时间，恢复时间为22 s，而PEO-CuO-MWCNT: 3%的复合材料在相同RH范围内分别表现出20 s和11 s的响应时间。

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