pH matters: Protonation–deprotonation of an ethylenediamine molecule is used to harness the aggregation‐dispersion process of gold nanoparticles (see image) and carbon nanotubes. The idea takes advantage of the doubly protonated molecule that acts as an electrostatic bridge between two oppositely charged nanoparticles.

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A hemoglobin sensor based on a molecularly imprinted polymer-modified electrode has been fabricated by electrochemically induced redox polymerization of acrylamide in the presence of hemoglobin.

A simple, rapid fabricated and sensitive modified electrode for detection of As(III) in alkaline media was proposed. The modified electrode was prepared by co‐electrodeposition of manganese oxides (MnOx) and gold nanoparticles (AuNPs) on the glassy carbon electrode (GCE) with cyclic voltammetry. Linear sweep anodic stripping voltammetry (LS‐ASV) was employed for the determination of arsenic (III) without interference from Cu(II), Hg(II), and other coexisting metal ions. A lower detection limit of 0.057 µg L−1 (S/N=3) were obtained with a accumulation time of 200 s. The proposed method was successfully applied to determine arsenic (III) in real water samples with satisfactory recoveries.