Synthesis of highly stable fluorescent poly(methacrylic acid-co-itaconic)-protected silver nanoclusters and sensitive detection of Cu²⁺

Abstract

Silver nanoclusters were synthesized through one-step UV photoreduction using the multiple carboxyl copolymer poly(methacrylic acid-co-itaconic acid) as a novel template, which can be used for highly sensitive and selective detection of Cu2+ by fluorescence quenching.

Synthesis of Dual Red‐Emitting Fluorescent Silver Nanoclusters in Aqueous Lipoic Acid‐Based Polymer Solutions and Application for Cu2+ Detection and Cell Imaging

“…At the same time, valence state of Ag is determined by XPS, as shown in Figure 3C. Binding energies of 368.2 eV (Ag 3d5/2) and 374.2 eV (Ag 3d3/2) belong to Ag(0) and Ag(I), respectively, indicating that Ag ions are successfully reduced by NaBH 4 to form metallic Ag [9] . The obtained fluorescent AgNCs possesses a high quantum yield of 7.1 % under the concentration of 9.61×10 −6 M and a long lifetime up to 1.4×10 4 ns (Figure 3D).…”

“…Binding energies of 368.2 eV (Ag 3d5/2) and 374.2 eV (Ag 3d3/2) belong to Ag(0) and Ag(I), respectively, indicating that Ag ions are successfully reduced by NaBH 4 to form metallic Ag. [9] The obtained fluorescent AgNCs possesses a high quantum yield of 7.1 % under the concentration of 9.61 × 10 À 6 M and a long lifetime up to 1.4 × 10 4 ns (Figure 3D). On the other hand, the fluorescence lifetime of PVA-LAprotected AgNCs was recorded at different temperatures (Figure S4), and the fluorescence life decreased from 1.8 × 10 4 ns at 10 °C to 0.9 × 10 4 ns at 40 °C.…”

“…Copper (Cu) is an essential element for humans and plants when present in lesser or excessive amounts it exerts detrimental effects [10] . Therefore, it is necessary to construct a simple and effective method for detecting Cu 2+ with high sensitivity and good selectivity [4a,9–11] . The fluorescence of the obtained AgNCs was strongly quenched by Cu 2+ addition and our reported synthetic fluorescent Ag nanoclusters were further utilized as a fluorescent probe to detect Cu 2+ in water with presence of other interfering metallic ions.…”

“…Polymers containing a high density of carboxyl groups (−COOH) are also often used as ligands for the synthesis of AgNCs [8] . Recently, our group has reported the synthesis of a novel AgNCs protected by poly(methacrylic acid‐co‐itaconic), which showed high stability, good dispersity and a high quantum yield [9] . Multiple protective ligands have been successfully prepared and applied to the synthesis of MNCs, which can be beneficial to promote the study of MNCs.…”

N-Cholyl d-Penicilamine Micelles Templated Red Light-Emitting Silver Nanoclusters: Fluorometric Sensor for S2– Ions and Bioimaging Application Using Zebrafish Model

“…Rotello and co-workers reported polyethylenimine-functionalized cationic AgNCs as potent antimicrobials against multidrug-resistant bacteria . Red-emitting AgNCs were synthesized using poly­(methacrylic acid) as a template under UV irradiation . Yu et al investigated BSA-templated AgNCs as an effective singlet oxygen generation capacity for photodynamic therapy (PDT) .…”