We report on the hydrothermal synthesis of borondoped carbon dots (B-CDs) starting from glucose and boric acid. Doping of the CDs with boron was confirmed by Fourier transform infrared and X-ray photoelectron spectroscopy. The B-CDs have an average diameter of about 4 nm and display blue fluorescence which is dynamically quenched by Fe(III) ions. This finding was exploited to design a method for the determination of Fe(III) in water. The relative fluorescence intensity at 359 nm in the presence and of absence ions is inversely proportional to the concentration of Fe(III) ions, and a Stern-Volmer calibration plot is linear in the concentration range of 0-16 μM, with a 242 nM detection limit. The assay is sensitive, robust and selective.

Covalent organic frameworks (COFs) were fabricated with hierarchical flower-like hollow structure, possessing large specific surface area, high porosity, and excellent environmental stability. In-situ growth of noble silver nanoparticles (AgNPs) onto...

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