Figure 5.
Color changes of AuNPs-1 suspension (Tris-HCl 0.01 M, pH 7) in the presence of increasing amounts of formaldehyde (from left to right, 0 µM, 25 µM, 50 µM, 75 µM, 100 µM, 200 µM, 400 µM, 600 µM, 1 mM, 10 mM).
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