Wide-Area Strain Sensors based upon Graphene-Polymer Composite Coatings Probed by Raman Spectroscopy
作者： Arun Prakash Aranga Raju , Amanda Lewis , Brian Derby , Robert J Young , Ian A Kinloch
关键词: Optoelectronics 、 Graphene 、 Single crystal 、 Residual stress 、 Graphene nanoribbons 、 Raman spectroscopy 、 Graphene oxide paper 、 Analytical chemistry 、 Coating 、 Materials science 、 Chemical vapor deposition
摘要: Functional graphene optical sensors are now viable due to the recent developments in hand-held Raman spectroscopy and chemical vapor deposition (CVD) of films. Herein, strain graphene/poly (methyl methacrylate) sensor coatings is followed using band shifts. The performance an "ideal" mechanically-exfoliated single crystal flake compared a scalable CVD film. dry-transferred mechanically exfoliated sample has no residual stresses, whereas compression following solvent evaporation during its transfer. behavior under cyclic deformation shows initial breakdown graphene-polymer interface with then stabilizing after several cycles. 2D shift rates per unit approximate 35% higher than making former more sensitive. However, for practical wide-area applications, still candidates as system can be used read any 5 m diameter spot coating absolute accuracy 0.01% resolution 27 microstrains (mu s), which compares favorably commercial photoelastic systems.
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