Highly selective colorimetric detection of Ni using silver nanoparticles cofunctionalized with adenosine monophosphate and sodium dodecyl sulfonate.

Feng, Jiayu; Jin, Weiwei; Huang, Pengcheng; Wu, Fangying

We report a dual-ligand strategy based on silver nanoparticles (AgNPs) for highly selective detection of Ni using colorimetric techniques. Adenosine monophosphate (AMP) and sodium dodecyl sulfonate (SDS) were both used as ligands to modify AgNPs. The presence of Ni induces the aggregation of AgNPs through cooperative electrostatic interaction and metal-ligand interaction, resulting in a color change from bright yellow to orange. The cofunctionalized AgNPs showed obvious advantages over the ones functionalized only by AMP or SDS in terms of selectivity. Under the optimized conditions, this sensing platform for Ni works in the concentration range of 4.0 to 60 μM and has a low detection limit of 0.60 μM. In addition, the colorimetric assay is very fast, and the whole analysis can be completed within a few minutes. Thus, it can be directly used in tap water and lake water samples.

COLORIMETRIC analysis; NICKEL; SILVER nanoparticles; ADENOSINE monophosphate; SODIUM dodecyl sulfate

Journal of Nanoparticle Research, 2017, Vol 19, Issue 9, p1

1388-0764

Academic Journal

10.1007/s11051-017-3998-0