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A sensitive and selective colorimetric method for detection of copper ions based on anti-aggregation of unmodified gold nanoparticles

Hormozi-Nezhad, M. R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.talanta.2014.05.022
  3. Abstract:
  4. A highly sensitive and selective colorimetric method for detection of copper ions, based on anti-aggregation of D-penicillamine (D-PC) induced aggregated gold nanoparticles (AuNPs) was developed. Copper ions can hinder the aggregation of AuNPs induced by D-PC, through formation of mixed-valence complex with D-PC that is a selective copper chelator. In the presence of a fixed amount of D-PC, the aggregation of AuNPs decreases with increasing concentrations of Cu2+ along with a color change from blue to red in AuNPs solution and an increase in the absorption ratio (A520/A 650). Under the optimum experimental conditions (pH 7, [AuNPs] =3.0 nmol L-1 and [NaCl]=25 mmol L-1), a linear calibration curve for Cu2+ was obtained within the range of 0.05-1.85 μmol L-1 with a limit of detection (3Sb) of 30 nmol L -1. Excellent selectivity toward Cu2+ was observed among various metal ions due to a specific complex formation between Cu2+ and D-PC. The proposed method has been successfully applied for the detection of Cu2+ in various real samples
  5. Keywords:
  6. Gold nanoparticle ; Colorimetry ; Gold ; Metal ions ; Metal nanoparticles ; Anti-aggregation ; Colorimetric detection ; Copper ions ; Experimental conditions ; Gold Nanoparticles ; Linear calibration curve ; Mixed valence complexes ; Unmodified gold nanoparticles ; Copper compounds
  7. Source: Talanta ; Vol. 129, issue , 2014 , pp. 227-232 ; ISSN: 00399140
  8. URL: http://www.sciencedirect.com/science/article/pii/S0039914014004068