Novel Metal-Free Fluorescent Sensor Based on Molecularly Imprinted Polymer N-CDs@MIP for Highly Selective Detection of TNP

Abstract

In this article, we designed a fluorometric sensor based on nitrogen-passivated carbon dots infused with a molecularly imprinted polymer (N-CDs@MIP) via a reverse microemulsion technique using 3-aminopropyltriethoxysilane as a functional monomer, tetraethoxysilane as a cross-linker, and 2,4,6-trinitrophenol (TNP) as a template. The synthesized probe was used for selective and sensitive detection of trace amounts of TNP. The infusion of N-CDs (QY-21.6 percent) with a molecularly imprinted polymer can increase the fluorescent sensor sensitivity to detect TNP. Removal of template molecules leads to the formation of a molecularly imprinted layer, and N-CDs@MIP fluorescence response was quenched by TNP. The developed fluorescence probe shows a fine linear range from 0.5 to 2.5 nM with a detection limit of 0.15 nM. The synthesized fluorescent probe was used to analyze TNP in regular tap and lake water samples.

Highly Efficient Sulfur and Nitrogen Codoped Graphene Quantum Dots as a Metal-Free Green Photocatalyst for Photocatalysis and Fluorescent Ink Applications

“…The stretching vibration of O–H and N–H bonds correlates to a large absorption peak around 3000–3500 cm –1 . 39 , 40 The C=O stretching vibration appears at 1634 cm –1 . 17 Two small peaks at 1318 and 1215 cm –1 arise due to asymmetric and symmetric stretching vibrations of C–O–C.…”

Sialyl-Tn Antigen-Imprinted Dual Fluorescent Core–Shell Nanoparticles for Ratiometric Sialyl-Tn Antigen Detection and Dual-Color Labeling of Cancer Cells

“…Additionally, in comparison with traditional fluorescent dyes and conjugated antibodies, nanoparticles with a size ranging from 10 to 100 nm, such as modified carbon nanodots and quantum dots, possess alternative properties that enhance their imaging capabilities on fixed cells . Accordingly, carbon nanodots (CNDs) have also recently been used in combination with conventional MIP shells for (bio)­analytical applications. − …”

“… 50 Accordingly, carbon nanodots (CNDs) have also recently been used in combination with conventional MIP shells for (bio)analytical applications. 51 − 53 …”

Selective and sensitive on-site colorimetric detection of 4,4′-isopropylidenediphenol using non-enzymatic molecularly imprinted graphitic carbon nitride hybrids in milk and water samples

“…MIP (molecularly imprinted polymer) is a facile and promising material for creating molecule-specific recognition cavities in synthetic polymers that selectively bind with the template molecules through Molecular Imprinting Technology (MIT). 24 In the early 1980s, the concept of molecular imprinting was a non-covalent strategy that involved biomedical and analytical applications due to the ease of creating complexes of host–guest before polymerization using weak intermolecular interactions. The MIPs synthesis process is a multi-step process.…”