One-Step Synthesis of Fluorescent Boron Nitride Quantum Dots via a Hydrothermal Strategy Using Melamine as Nitrogen Source for the Detection of Ferric Ions

Abstract

A facile and effective approach for the preparation of functionalized born nitride quantum dots (BNQDs) with blue fluorescence was explored by the hydrothermal treatment of the mixture of boric acid and melamine at 200 °C for 15 h. The as-prepared BNQDs were characterized by transmission electron microscopy (TEM), high-resolution TEM, atomic force microscopy, X-ray photoelectron spectroscopy, UV-vis spectroscopy, and fluorescence spectroscopy. The single layered BNQDs with the average size of 3 nm showed a blue light emission under the illumination of the UV light. The BNQDs could be easily dispersed in an aqueous medium and applied as fluorescent probes for selective detection of Fe with remarkable selectivity and sensitivity (the lowest detection limit was 0.3 μM). The fluorescence fiber imaging demonstrated that the as-prepared quantum dots could be used as a valuable fluorchrome. Therefore, the BNQDs could be envisioned for potential applications in many fields such as biocompatible staining, fluorescent probes, and biological labeling.

Preparation of Ti3C2Tx MXene‐Derived Quantum Dots with White/Blue‐Emitting Photoluminescence and Electrochemiluminescence

“…The control experiment confirmed the fluorescence of the stained silk fiber was not from the scattering light . These results showed that the MQDs could be potentially used as fluorescent imaging and staining reagent for further chem‐ or bioimaging …”

Boron Nitride Quantum Dots Derived from Renewable Lignin

“…AFM images (Figure e‐h) further confirm the uniformity of the as‐synthesized BNQDs. The AFM height profiles (inset of Figure e‐h) demonstrate typical topographic height of the BNQDs ranging from 0.76 to 1.93 nm, corresponding to 1–3 BN layers …”

“…Therefore, its further application is seriously limited. Recently, Huo et al . proposed a economical and promising approach for the preparation of functionalized BNQDs by the hydrothermal treatment of the mixture of boric acid and melamine at high temperature.…”

Boron Oxynitride Quantum Dots for CO2 Photoreduction

“…30 This is in agreement with previous literature reports. 18,25 As illustrated in the inset of Fig. 2a, the dark dot shows clear lattice fringes of 0.34 nm, corresponding to an interplanar d(002)-spacing.…”

“…36 The presence of carbon in BN QDs is common and has been reported. 18,35,37 Compared to hydro-/solvothermal routes, bottom-up pyrolytic syntheses of BN, more so under the presence of ammonia 38 , aid the removal of carbon from the end product. 27,28 To gain further insight into the relative atomic surface composition and chemical states of the elements, we collected high resolution core level B 1s, C 1s, N 1s and O 1s spectra through XPS.…”