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(a, b) TEM images of the AuNR@TiO2 nanozymes. (c) UV–vis spectra of AuNRs and AuNRs@TiO2. Inset: scheme of the plasmon-assisted chemical reaction on AuNR-based nanozymes. (d) AR oxidation measured by a fluorometer. The increasing intensity at ∼583 nm reflects the formation of fluorescent product RF. Inset: illustration of AR oxidation catalyzed by AuNR in the presence of H2O2.
