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Novel carbon dots for zinc sensing from Campomanesia phaea

2020; Elsevier BV; Volume: 283; Linguagem: Inglês

10.1016/j.matlet.2020.128813

1873-4979

Afonso Henrique da Silva Júnior, Domingos Lusitâneo Pier Macuvele, Humberto Gracher Riella, Cíntia Soares, Natan Padoin,

Molecular Sensors and Ion Detection

• Novel Campomanesia phaea based carbon dots (CDs) were synthesized. • The pH adjuster affected the quantum yield , sensibility, and functional groups. • Highly fluorescent carbon dots with a quantum yield of 21.26% were obtained. • The CDs exhibited highly stable fluorescence and sensitivity to Zn 2+ (5.4 μм LOD). Highly fluorescent nitrogen-doped carbon dots (CDs) were synthesized from cambuci juice ( Campomanesia phaea (O. Berg) Landrum) and successfully used for zinc (Zn 2+ ) sensing based on fluorescence quenching. The CDs were synthesized at different pH, using NaOH and NH 4 OH as pH adjusters. The CDs synthesized were characterized by Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), Raman spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Zeta potential, UV–Vis, and fluorescence spectroscopy. The CDs synthesized from juice with pH 7 and adjusted by NH 4 OH presented a high sensitivity to Zn 2+ and a higher quantum yield (21.26%). The minimum limit of detection (LOD) was 5.4 µм. The linear range (LR) is between 25 and 125 µм. The sensor exhibits great potential for applications as a zinc detector for biological and environmental systems.