Optimized Sensitivity in Copper(II) Ion Detection: Sustainable Fabrication of Fluorescence Red-Shifted Graphene Quantum Dots via Electron-Withdrawing Modulation

Molecules, Journal Year: 2025, Volume and Issue: 30(6), P. 1244 - 1244

Published: March 10, 2025

Graphene quantum dots (GQDs) represent a class of promising nanomaterials characterized by adjustable optical properties, making them well suited for applications in biosensing and chemical detection. However, challenges persist achieving scalable, cost-effective synthesis enhancing detection sensitivity. In this study, we have developed simple environmentally friendly method to prepare blue graphene dots, c-GQDs, using nitronaphthalene as precursor, yellow y-GQDs, doped acid. The yield is 29.75%, the average thickness 2.08 nm 3.95 nm, respectively. synthesized c-GQDs exhibit prominent cyan fluorescence at wavelength 490 under excitation 380 while y-GQDs show distinct 540 494 nm. introduction p-aminobenzoic acid (PABA) introduced marked red shift fluorescence, attributed electron-withdrawing effect carboxyl groups on PABA. This key finding significantly enhanced sensitivity GQDs detecting trace copper(II) ions (Cu2+), heavy metal contaminant posing serious environmental risks. was selectively quenched presence Cu2+, facilitating accurate sensitive even complex ion matrices. Mechanistic studies revealed that quenching driven strong static interactions, which inhibit non-radiative transitions. work not only introduces scalable producing high-performance but also highlights their potential effective fluorescent probes monitoring

Language: Английский

Curcuminoid-Linked Lemon-Derived Carbon Dots for pH-Triggered Drug Release

ACS Omega, Journal Year: 2025, Volume and Issue: unknown

Published: May 20, 2025

Language: Английский