Highly Sensitive Detection of Fe³⁺ Ions Using Waterborne Polyurethane‐Carbon Dots Self‐Healable Fluorescence Film

Abstract

In this study, nitrogen‐doped carbon dots (N‐C‐dots) are synthesized via a green and gentle electrochemical‐hydrothermal method. The N‐C‐dots are grafted into the backbone of waterborne polyurethane (WBPU) synthesized from hexamethylene diisocyanate and polycarbonate diol (PCDL). Due to the introduction of N‐C‐dots, the WBPU is functionalized including being able to self heal and specifically identified Fe3+. The self‐healing performance of the WBPU‐N‐C‐dots film is principally attributed to the hydrogen bonding effect of the WBPU and the N‐C‐dots. On the other hand, based on the quenching of fluorescent characteristics of the WBPU‐N‐C‐dots film, it is successfully used in the detection of Fe3+, showing a wide detection range, good selectivity, and high sensitivity. What's more, the tensile strength of the sample is enhanced from 3.50 to 7.12 MPa when the N‐C‐dots content is increased in the WBPU and the thermal stability is improved as a result of the formation of the more thermally‐stable network structures. Interestingly, compared to the traditional solution detection in WBPU‐N‐C‐dots emulsion with the limit of detection of 2.23 × 10−6 m, the detection has the lower limit of detection of 2.19 × 10−6 m in the WBPU‐N‐C‐dots film. These results show that the WBPU‐N‐C‐dots film exhibits great application as an intelligent response‐type material.

N-alkylation briefly constructs tunable multifunctional sensor materials: Multianalyte detection and reversible adsorption

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Healable Strain Sensor Based on Tough and Eco-Friendly Biomimetic Supramolecular Waterborne Polyurethane

“…Moreover, with this design concept, decent mechanical performance and self-healing ability can be achieved simultaneously in many cases. ,− Nevertheless, most of these research studies still focus on the development of organic solvent-based polyurethanes, but the applied organic solvents can always be unfavorable for the ecosystems and human health. The waterborne polyurethane, using water as the dispersion medium, can effectively avoid the drawbacks of organic solvents. − Therefore, it is highly recommended to rationally develop environment-friendly waterborne polyurethane with high emulsion stability, remarkable mechanical performance, as well as good self-healing capability.…”

Integration detection of mercury(ii) and GSH with a fluorescent “on-off-on” switch sensor based on nitrogen, sulfur co-doped carbon dots

“…40 However, most of them are laborious, intricate, and in need of professional operating and expensive instruments. Fluorescence probes providing a better choice of Hg 2+ ions and GSH detection in living cells, tissues, even animals due to the exclusive advantages of high sensitivity, 41,42 simple controls, convenient testing/monitoring and quick response, etc. However, most of the conventional uorescent probes such as small organic uorescent molecule, and semiconductor quantum dots are relatively toxic and poorly watersoluble, and greatly limit the detection of Hg 2+ ions and GSH in bioassay.…”