CO32− ion-induced Cu2+ ion determination using DPA capped-LaF3:Eu3+ nanocrystals. Issue 46 (10th October 2022)

• Record Type: Journal Article
• Authors: Adusumalli, Venkata N. K. B.; Lis, Stefan; Il Park, Yong
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 46(2022)
• Page Start: 17494
• Page End: 17501
• Publication Date: 2022-10-10
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc03196e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The fluorescence quenching strategy has been developed as an exceedingly selective and sensitive method for the determination of Cu 2+ ions in the presence of CO3 2− ions in an aqueous medium. Abstract : The fluorescence quenching strategy has been developed as an exceedingly selective and sensitive method for the determination of Cu 2+ ions in an aqueous medium. For this purpose, we designed and synthesized dipicolinic acid (DPA)-capped-LaF3 :Eu 3+ nanocrystals (NCs) in water, using microwave irradiation as a heating source. Here, DPA acts as a surfactant, controls the nanocrystal size, and is a sensitizer to Eu 3+ ions. Upon excitation at 280 nm, DPA transfers its exciting energy to Eu 3+ ions; subsequently, strong red emission occurs from DPA capped-LaF3 :Eu 3+ NCs. The intense emission peaks of Eu 3+ ions are remarkably declined by Cu 2+ ions accompanied by CO3 2− ions (1 : 6 ratio to Cu 2+ ions). Cu 2+ ions with CO3 2− ions in an alkali medium form Cu2 CO3 (OH)2, a broad and strong absorbent in the UV region, and intersect with the excitation spectra of the DPA-capped LaF3 :Eu 3+ NCs. More than 90% of the emission intensity of Eu 3+ ions was quenched after the addition of a 100 μM concentration of Cu 2+ ions. The quenching was highly selective only towards Cu 2+ ions and showed almost no interference from many other metal ions. The calculated limit of detection was 117 nM using a linear Stern–Volmer plot.