Maher Ashraf, Mahmoud Mohamed S, Saba Ashraf Mahroos Said
Department of Chemical Engineering, Faculty of Engineering, Minia University, El-Minya, 00201033144375, Egypt.
Professor, Department of Engineering, The University of Technology and Applied Sciences, Suhar, 311, 00201227553150, Oman.
Nanotechnology. 2021 Nov 15;33(6). doi: 10.1088/1361-6528/ac2e23.
The main objective of this work was to fabricate smart nanocomposite transparent conductive biophysiological electrodes based on modified graphene oxide (GO). The GO is abundant, flexible conductors that can be formulated as a transparent sheet and thereby alleviate the drawbacks of using indium tin oxide in transparent electrodes, like its scarcity, brittleness, and cost. GO was synthesized by a modified version of Hummers' method under highly acidic conditions with sulfuric acid and showed good distribution at a high temperature of 90 °C. Polyvinyl alcohol (PVA) was used as a polymer host in the composite. Glycerol (Gl) was used to increase the flexibility and conductivity through an esterification reaction. Characteristic techniques were used to detect the morphology and structure of GO fillers and their polymer composites, such as transmission electron microscopy, x-ray diffraction, scanning electron microscopy and Fourier transform infrared spectroscopy. The GO/Gl/PVA transparent nanocomposite was tested for the synthesis of electrocardiogram (ECG) and electrodermal (EDA) electrodes. The Biopac device was used to evaluate the behavior of the GO/Gl/PVA plastic transparent electrode in comparison to the GO/Gl/PVA black electrode and a commercial one. The results indicated improved efficiency of the GO/Gl/PVA ECG transparent electrode. The GO/Gl/PVA EDA electrode produced signals with higher conductivity and lower noise than the commercial electrode.
这项工作的主要目标是基于改性氧化石墨烯（GO）制备智能纳米复合透明导电生物生理电极。GO是丰富且灵活的导体，可制成透明薄片，从而缓解在透明电极中使用氧化铟锡的缺点，如稀缺性、脆性和成本。GO通过改良的Hummers法在浓硫酸的高酸性条件下合成，并在90°C的高温下显示出良好的分布。聚乙烯醇（PVA）用作复合材料中的聚合物主体。甘油（Gl）用于通过酯化反应提高柔韧性和导电性。采用特征技术检测GO填料及其聚合物复合材料的形态和结构，如透射电子显微镜、X射线衍射、扫描电子显微镜和傅里叶变换红外光谱。对GO/Gl/PVA透明纳米复合材料进行了心电图（ECG）和皮肤电反应（EDA）电极的合成测试。与GO/Gl/PVA黑色电极和商用电极相比，使用Biopac设备评估GO/Gl/PVA塑料透明电极的性能。结果表明GO/Gl/PVA ECG透明电极的效率有所提高。GO/Gl/PVA EDA电极产生的信号比商用电极具有更高的导电性和更低的噪声。
