Ultrasensitive colorimetric detection of manganese(II) ions based on anti-aggregation of unmodified silver nanoparticles

作者：He, Yi^*; Zhang, Xianhui

来源：Sensors and Actuators B: Chemical , 2016, 222: 320-324.

DOI：10.1016/j.snb.2015.08.089

• Unmodified silver nanoparticles
• Calorimetric assay
• Mn2+ ions
• Anti-aggregation
• L-arginine

We report a facile, selective, and sensitive colorimetric assay for Mn2+ ions based on the anti-aggregation of unmodified silver nanoparticles (AgNPs). In the absence of Mn2+ ions, the addition of L-arginine to the AgNPs dispersion caused the aggregation of AgNPs via Ag-N covalent interaction, and the color of the solution changed from yellow to colorless. While the presence of Mn2+ ions can prevent the aggregation of AgNPs due to the formation of the complex between Mn2+ ions and L-arginine, accompanying with a distinct color change from colorless to yellow with the increase of Mn2+ ions. Under the optimal experimental conditions, the absorbance at 390 nm was linearly proportional to the Mn2+ ions concentration in the ranges from 0 to 700 nM, and from 5 mu M to 70 mu M, with a detection limit of 20 nM. Also, it was successfully used for the detection of Mn2+ ions in environmental water samples.

• 出版日期2016-1
• 单位西南科技大学