乙烯醇
纳米复合材料
材料科学
自愈水凝胶
纳米压痕
摩擦电效应
化学工程
动态力学分析
电介质
流变学
石墨烯
傅里叶变换红外光谱
氧化物
复合材料
高分子化学
纳米技术
聚合物
光电子学
工程类
冶金
作者
Swati Sharma,Akanksha Adaval,Shiva Singh,Pradip K. Maji,Subash Cherumannil Karumuthil,V. H. Shafeeq,Arup R. Bhattacharyya
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2023-01-01
卷期号:19 (16): 2977-2992
被引量:1
摘要
The present investigation aims to develop hydrogels with higher mechanical stability for triboelectric applications by adopting a simple method to fabricate a graphene oxide (GO) incorporated poly(vinyl alcohol) (PVA) nanocomposite hydrogel. Instead of the traditional repeated freeze-thaw method, high-shear solution mixing followed by solvent exchange with deionized water was adopted. Morphological observations showed dense and undulated microstructures in the nanocomposite hydrogel with increased GO concentration. Attenuated Total Reflection Fourier Transform Infrared spectroscopy confirmed a higher degree of intermolecular H-bonding between the hydroxyl group of PVA and oxygenated groups of GO, which leads to a robust gel formation. The formation of a robust PVA/GO nanocomposite hydrogel was examined through rheological investigations at room temperature. Nanoindentation analysis estimated a significant increase in hardness and Young's modulus of the nanocomposite hydrogels. Broadband dielectric spectroscopy showed the variation of the dielectric properties of the PVA/GO nanocomposite hydrogels with increased GO concentration. The PVA/GO nanocomposite hydrogels exhibited a maximum output voltage of 3.65 V at 0.075 wt% GO content during finger tapping experiment suggesting the potential for triboelectric applications. The extensive analysis demonstrates the influence of a very low concentration of GO on the variation of the morphology, rheology, mechanical, dielectric, and triboelectric properties of PVA/GO nanocomposite hydrogels.
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