We present a highly sensitive Pb2+ detection method by in situ real-time imaging of Pb2+ catalyzed etching and size reduction of immobilized single gold nanoparticles with darkfield microscopy. The detection limit is 0.2 pM, suggesting that direct observation of the catalytic activity of ∼5 lead ions on one gold nanoparticle surface is possible.
D. Dai, D. Xu, X. Cheng and Y. He, Anal. Methods, 2014, 6, 4507 DOI: 10.1039/C4AY00590B
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