Urea-doped carbon dots as fluorescent switches for the selective detection of iodide ions and their mechanistic study

Abstract

Urea-doped carbon dots (N-CDs) have been successfully fabricated for monitoring iodide ions; the reduced lifetime of N-CDs demonstrated that the excited energy dissipation led to a dynamic fluorescence quenching process.

N-doped carbon dots as robust fluorescent probes for the rapid detection of hypochlorite

“…Fluorescence lifetime ( τ ) is a significant factor to evaluate the photoluminescence efficiency of luminescent materials. 32 The fluorescence lifetime ( τ ) of four CDs (NCDs, MeO-NCDs, CF 3 -NCDs and NO 2 -NCDs) were measured through time-resolved fluorescence employing time-correlated single photon counting (TCSPC) technique (excitation wavelength at 370 nm). The decay curves of four CDs were obtained through biexponential functions fitting.…”

Sustainability Assessment of Highly Fluorescent Carbon Dots Derived from Eucalyptus Leaves

“…The absorption bands ranging from 1200 to 1000 cm −1 can be attributed to the C-O-C groups. The N-H deformation vibration is observed at 831 cm −1 [49]. The FTIR signals demonstrate that CDs have hydrophilic functional groups (hydroxyl, amino and carboxyl groups) that promote water solubility and fluorescence of the synthesized CDs [50].…”

Nanomaterial-based probes for iodide sensing: synthesis strategies, applications, challenges, and solutions

“…Standard analytical techniques used to estimate the iodide-ion levels include ultraviolet-visible spectroscopy, 8 time-resolved absorption spectroscopy, 9 cold vapor atomic absorption spectroscopy, 10 inductively coupled plasma mass spectrometry, 11 atomic absorption spectroscopy, 12 cyclic voltammetry, 13 chromatography, 14 electrophoresis, 15 Raman scattering, 16 electrochemical sensing, 17 and flow injection spectrophotometric analysis. 18 Although these are well-established analytical techniques, they still require sophisticated equipment, skilled personnel, and complex sample preparation procedures to detect iodide ions.…”