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Utilization of triangle nanosilver to prepare spherical nanosilver and quantitatively detect trace titanium by SERS

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Figure

Figure 1 Principle for SERS detection of Ti, based on its catalysis of KBrO3-ST reaction
Figure 3 The formation and oxidization processes of BAgNPs and their size distribution
Figure 4 Absorption spectra of the BAgNP-NaX sols in different colors. (a) 5.0 × 10−5 mol/L BAgNP sol was in blue; (b) the BAgNP sol wasmixed with 5.0 × 10−4 mol/L NaCl that showed a blue-violet color; (c) (a) + 10 × 10−4 mol/L NaCl solution in light yellow; (d) (a) + 15 × 10−4 mol/LNaCl solution in yellow; (e) (a) + 100 × 10−4 mol/L NaCl solution in yellow; (f) (a) + 250 × 10−4 mol/L NaCl solution in yellow; (g) 5.0 × 10−5 mol/LBAgNP + 2.5 × 10−6 mol/L NaBr solution in yellow; (h) 5.0 × 10−5 mol/L BAgNP + 40 × 10−6 mol/L KI solution in deep yellow.
Table 1 Effect of coexistent ions on the SERS quantitativeanalysis of 40 ng/mL Ti
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