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(a) UV-vis absorption spectra of AuNPs-rGO for i) 0 μM, ii) 0.1 μM, iii) 1 μM, iv) 5 μM, v) 10 μM, vi) 20 μM, vii) 50 μM, viii) 100 μM and ix) 200 μM additions of NO2 −. (b) The plot of absorbance ratio (A626/ A525) vs. [NO2 −]. (c) Linear plot of A626/A525 vs. [NO2 −] from 0.1 to 20 μM.
