石墨烯
材料科学
剥脱关节
拉曼光谱
纳米技术
X射线光电子能谱
复合材料
石墨
化学工程
光学
物理
工程类
作者
Kausik Manna,Federico Bosia,Kenneth J. Loh,Wei-Hung Chiang
标识
DOI:10.1002/admi.201900034
摘要
A novel approach to leverage the extraordinary properties of graphene for designing thin film strain sensors is demonstrated. Graphene nanosheets (GNS) are produced from graphite by a liquid phase exfoliation (LPE) method using water along with N-methylpyrrolidinone (NMP) as cosolvents. It is found that the water-NMP solvent system enhances the exfoliation yield and the stability of the GNS dispersion, thereby lowering the number of defects in the GNS basal plane. Both LPE-based GNS and reduced graphene oxide (RGO) are synthesized for fabricating thin film strain sensors and for comparison purposes. Detailed micro-Raman, X-ray photoelectron spectroscopy, and transmission electron microscopy studies indicate that the as-produced GNS exhibits lower defects than RGO nanosheets. The strain sensing study reveals that strain sensors fabricated using low-defect GNS exhibit enhanced electrical and electromechanical properties, including higher electrical conductivity, lower noise floor, and more stable electromechanical response as compared to RGO-based sensors.
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