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Nanoplasmonic Sensor for label-free detection of COVID-19: (A) Sensor chip coated with SARS-CoV-2 mAbs. Colorimetric detection with AuNPs conjugated with ACE2 protein or mAb. (B) Au nanocup array chip with a drop of water on top. (Left) Zoomed SEM image of the nanocup array. (Right) TEM image showed air and water interfaces exhibiting green and far red pink colors, respectively.
