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. 2019 Oct 18;9(10):1488. doi: 10.3390/nano9101488

Figure 5.

Figure 5

UV–Vis absorption spectra of AuNP for different HAuCl4/sodium citrate ratios: (a) 1:1, (b) 1:3, (c) 1:1.75, and (d) 1:0.3. The total volume was kept at 40 mL, and the plasma treatment time was 90 s.