Fig. 2. Photographic images of the TLC microfluidic paper-based calorimetric sensor for reaction systems: (A) GNSs (zone 1–4) and AuNPs–CysA (zone 1′–4′), (B) AuNFs pH = 4.91 (zone 1–4) and AuNFs pH = 6.15 (zone 1′–4′).
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