N, B-doped carbon dots as a sensitive fluorescence probe for Hg(2+) ions and 2,4,6-trinitrophenol detection for bioimaging.

Nitrogen and boron co-doped carbon dots (BCNDs1-3) were prepared from three kinds of borate via a facile hydrothermal method. The as-prepared BCNDs did not shift with the change of excitation wavelength and possess good water dispersibility, strong fluorescence emission with high fluorescent quantum yield of 29.01%, 51.

New fluorescence probe for Fe³⁺ with bis-rhodamine and its application as a molecular logic gate.

A bis-rhodamine based fluorescent probe R1 for naked-eye detection of Fe(3+) with enhanced sensitivity compared to a mono-rhodamine derivative that shows selectivity for Hg(2+), has been synthesized. The 1:1 stoichiometric structure of R1 and Fe(3+) is confirmed using a Job's plot estimation and density functional theory calculations. The reversibility of R1 is verified through its spectral response toward Fe(3+) and S(2-) titration experiments.

Highly luminescent organosilane-functionalized carbon dots as a nanosensor for sensitive and selective detection of quercetin in aqueous solution.

The organosilane-functionalized carbon dots (SiCDs) were synthesized using citric acid with N-(b-aminoethyl)-g-aminopropyl methyldimethoxy silane (AEAPMS). The as-synthesized SiCDs were characterized by IR, TEM, XPS, NMR and fluorescence. The SiCDs showed a strong emission at 455 nm with excitation at 365 nm.