Molten salt synthesis of water-dispersible polymeric carbon nitride nanoseaweeds and their application as luminescent probes

Abstract

A molten salt method has been developed for synthesis of polymeric carbon nitride nanoseaweeds (CNNSs) using melamine and NaCl/KCl as precursor and eutectic salts, respectively. The resulting CNNSs present uniform shape which are about 20 nanometers wide and several hundred nanometers long. Moreover, they show excellent water dispersibility and enhanced photoluminescence properties, which make the CNNSs possess the potential as luminescent probes. Employed tetracycline (TC) as target, we have investigated the feasibility of utilizing the CNNSs for TC detection and the results demonstrate high selectivity and sensitivity, with detection limit of 0.04 μM. Interestingly, this work provides a general method to synthesize CNNSs from other precursors, such as guanidine hydrochloride and dicyandiamide.

Dual‐Function HKUST‐1: Templating and Catalyzing Formation of Graphitic Carbon Nitride Quantum Dots Under Mild Conditions

“…FT‐IR spectrum (Figure 2 b) included sharp absorption peak at 810 cm −1 that may be originates from the tri‐s‐triazine ring‐sextant out‐of‐plane bending vibration confirming the presence of the heptazine rings in the g‐CNQDs structure [1c] . The stretching band at 1085 cm −1 is related to C‐O vibration while the range between 1200 to 1700 cm −1 correspond to the vibrations of the C‐NH‐C or C‐N‐(C)‐C in case of partial or full condensation, respectively [4c, 26] .…”

Graphitic carbon nitride nanotubes: a new material for emerging applications

“…92 In the synthesis of intercalated GCN compounds using eutectic salt mixtures, in particular, LiCl-KCl-NaCl, the cubic salt crystals play the role of templates inducing the formation of tubular GCNs. [93][94][95][96][97][98][99][100] A typical case of the melamine polycondensation at 550 C in the eutectic mixture of LiCl  H 2 O-KCl-NaCl (weight ratio of 1 : 1 : 1) yields GCNTs with a 200 nm tetragonal cross section and a length of about 2 mm ( Fig. 2a).…”

Tailored Graphitic Carbon Nitride Nanostructures: Synthesis, Modification, and Sensing Applications

“…The coordination of Cu 2+ to the inherent ligands (NH 2 /NH/N) results in PET from mpg ‐ CN to Cu 2+ , quenching the FL of mpg ‐ CN, and a detection limit of 12.3 × 10 −9 m . The same sensing mechanism was employed to detect other metal ions, including Hg 2+ , Fe 3+ , Ag + , and Cr 6+ , and analytes that attach to the surface of g‐CN via π−π stacking, hydrogen bonding, and electrostatic interactions (e.g., 2,4,6‐trinitrophenol, N ‐nitrosopyrrolidine, tetracycline, and heparin) . These FL sensors in which g‐CN plays dual roles as both recognition elements and signal reporters suffer from poor selectivity.…”