title: Selective and sensitive recognition of Cu2+ in an aqueous medium: a surface-enhanced Raman scattering (SERS)-based analysis with a low-cost Raman reporter.
abstract: In the present study, surface-enhanced Raman spectra of a bifunctional Raman reporter, 2-mercaptobenzimidazole, has been found to be responsive exclusively towards Cu(2+) ions while the reporter remains anchored on the Au nanoparticle surface. Thus a specific Cu(2+)-ion-detection protocol emerges. The simplicity, sensitivity, and reproducibility of the method allow routine and quantitative detection of Cu(2+) ions. An interference study involving a wide number of other metal ions shows the procedure to be uniquely selective and analytically rigorous. A theoretical study was carried out to corroborate the experimental results. Finally, the method is promising for real-time assessment of Cu(2+) ions in aqueous samples and also has the ability to discriminate Cu(I) and Cu(II) ions in solution.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kharagpur, Kharagpur 721302, India.
authors.forename: Sougata
authors.initials: S
authors.lastname: Sarkar
authors.forename: Mukul
authors.initials: M
authors.lastname: Pradhan
authors.forename: Arun Kumar
authors.initials: AK
authors.lastname: Sinha
authors.forename: Mrinmoyee
authors.initials: M
authors.lastname: Basu
authors.forename: Tarasankar
authors.initials: T
authors.lastname: Pal
mesh_terms: D001562:Benzimidazoles / Q000737:chemistry*; D003300:Copper / Q000032:analysis*; D006046:Gold / Q000737:chemistry; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry*; D012996:Solutions / Q000737:chemistry; D013059:Spectrum Analysis, Raman / Q000379:methods*; D014481:United States; D014484:United States Environmental Protection Agency; D014867:Water
chemical_list: D001562:Benzimidazoles; D012996:Solutions; D014867:Water; C030698:2-mercaptobenzimidazole; D006046:Gold; D003300:Copper