Colorimetric detection of Cu2+ using 4-mercaptobenzoic acid modified silver nanoparticles

✍ Scribed by Ying Zhou; Hong Zhao; Yujian He; Nan Ding; Qian Cao

• Book ID: 113550122
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 515 KB
• Volume: 391
• Category: Article
• ISSN: 0927-7757
• DOI: 10.1016/j.colsurfa.2011.07.026

✦ Synopsis

A highly sensitive and selective method is proposed for colorimetric detection of copper ions using 4-mercaptobenzoic acid (4-MBA) modified silver nanoparticles (AgNPs). The presence of Cu2+ induces the aggregation of 4-MBA modified AgNPs, this resulting in a color change from bright yellow to purple. The concentration of Cu2+ could be quantified by naked eyes or a UV–vis spectrometer. The absorbance ratio (A
560nm/A
393nm) is linear with the concentration of Cu2+ ranging from 1×10−7
M to 1×10−4
M with a coefficient of 0.998. The detection limit is as low as 2.5×10−8
M. The proposed method could be successfully applied to determine Cu2+ in drinking water.