Bismuth nanoparticles in adsorptive stripping voltammetry of nickel

Carbon screen-printed electrodes (CSPE) are used as substrate for bismuth nanoparticles immobilization. Sensors modified with bismuth nanoparticles of different origin (prepared by the method of gas condensation and chemically synthesized) are used to determine nickel by adsorptive stripping voltammetry (AdSV). The effect of the structural organization of nanoparticles on sensor sensitivity is studied. It is established that chemically synthesized nanoparticles of bismuth, which form agglomerates of about 380 ± 76 nm on the electrode surface, demonstrate optimal sensory properties. Direct current (DC) voltammetric stripping response is linear and is observed within the range from 0.85 × 10− 8 to 8.48 × 10− 8 M Ni(II) (deposition time — 120 s). The detection limit is 3.2 nM, precision is good (RSD = 4.8% at 5.0 × 10− 8 M Ni(II), n = 14).

► This is the first application of bismuth nanoparticles in adsorptive stripping voltammetry.
► We modify carbon screen-printed electrodes with bismuth nanoparticles of different origin.
► On electrode surface gas-phase nanoparticles are evenly distribute.
► Chemically synthesized ones form quite large agglomerates.
► An increase in particle size results in higher sensor's sensitivity to nickel (II) complex with dimethylglyoxime.