One-pot synthesis of graphene quantum dots using humic acid and its application for copper (II) ion detection
Source abstract
Abstract
A new carbon source, humic acid, has been used in fabricating graphene quantum dots by a facial one-pot hydrothermal reaction. The morphology of the cyan emission graphene quantum dots has been characterized by high-resolution transmission electron microscopy (HRTEM). The result showed well-displayed crystalline with a lattice spacing of 0.286 nm. X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) have demonstrated the diverse functional groups on GQDs, like carboxylic groups, which will cause significant fluorescence quenching by Cu2+ because of the strong chelating interactions. The optical properties of GQDs were characterized by photoluminescence (PL) spectra and ultraviolet–visible (UV–Vis) spectroscopy; it showed that GQDs have an excitation-dependent fluorescence behavior and a large stoke shift with maximum excitation/emission wavelength at 360/470 nm. Furthermore, GQDs showed a good photostability by the kinetic analysis of irradiation for 1500 s and a relatively high quantum yield of 20%, which could be applied in bioimaging. Besides, the selectivity study of metal ions indicates that the GQDs could be used in Cu2+ detection. The linear range is from 1 to 40 μM with the limit of detection (LOD) of 0.44 μM. Overall, this work provided a simple method to produce GQDs with low-cost raw material humic acid, which could be also used in Cu2+ monitoring in river water.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Carbon and Quantum Dots Applications · Quantum Dots Synthesis And Properties · Nanocluster Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (62)
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