Fig. 3From: 4-Mercaptobenzoic acid-modified Au@Ag nanoparticle-based colorimetric Cr3+ ions detection in aqueous solutionThe effect of 4-MBA concentration on the detection system. The concentration was 10–7 M, 10–6 M, 5 × 10–6 M, 10–5 M, 10–4 M and 10–3 M, respectivelyBack to article page