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. 2019 Feb 22;9(2):302. doi: 10.3390/nano9020302

Figure 4.

Figure 4

UV-vis absorption spectra of AuNP-1 (10−9 M, in Tris-HCl 0.01 M, pH 7) in the presence of increasing amounts of aqueous formaldehyde. Inset: Plot of the absorption ratio (A645/A525) versus aqueous formaldehyde concentration.