title: Sensitive and selective detection of copper ions based on the aggregation of chitosan-stablized silver nanoparticles.
abstract: In this contribution, we present a simple and sensitive method for detecting Cu2+ based on the Cu(2+)-induced aggregation of silver nanoparticle (AgNPs) capped with chitosan. Chitosan could be adsorbed on the surface of AgNPs, and keep AgNPs against aggregation. However, in the presence of Cu2+, AgNPs aggregate again, the absorption decreases, and the color changes from yellow to colorless, which is due to the coordination of Cu2+ and chitosan. The depressed intensity (deltaA) is in proportion to the concentration of Cu2+ over the range of 3.33-40.0 microM with the limit of detection (3sigma) of 10.25 nM, the recovery of 92.60-104.20% and R.S.D. of 0.94-4.62%. The advantages of this method are simple, sensitive and low cost.
authors.affiliation: College of Chemistry and Chemical Engineering, MOE Key Laboratory for Luminescence and Real-Time Analysis, Southwest University, Chongqing 400718, PR China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zuo
authors.forename: Hua Wen
authors.initials: HW
authors.lastname: Zhao
authors.forename: Cheng Zhi
authors.initials: CZ
authors.lastname: Huang
authors.forename: Qing
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D002413:Cations, Divalent / Q000032:analysis / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D053768:Metal Nanoparticles / Q000737:chemistry*; D009994:Osmolar Concentration; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002413:Cations, Divalent; D012834:Silver; D003300:Copper; D048271:Chitosan