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Cyclic voltammograms of 5.0 × 10−5 mol L−1 luminol in PBS of pH 8.0 with the addition of DNA for (a) 0, (b) 2.8 × 10−7 mol L−1, (c) 5.5 × 10−7 mol L−1, (d) 8.2 × 10−7 mol L−1 and (e) 1.1 × 10−6 mol L−1. Insert are cyclic voltammograms on (a) bare GC electrode, (b) DNA/CNTs/AuNPs/GC electrode, (c) CNTs/AuNPs/GC electrode and (d) CNTs/GC electrode in buffer solution containing 0.1 mol L−1 K3[Fe(CN)6]. Both at the scan rate of 100 mV/s.
