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A label free and easy-to-prepare optical sensor with high mechanical strength for the fast and visible response to tension and pH variables was reported. An elastic nanocomposite hydrogel was successfully fabricated by in situ free-radical co-polymerization of N,N-dimethylacrylamide (DMAA), acrylic acid (AA) and aluminum oxide nanoparticles (Al2O3 NPs). DMAA and AA could form effective cross-linkage...
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