Enhanced luminescent properties of carbon quantum dots on thermo-responsive vinylcaprolactam hydrogel matrix

IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Carbon Trends Pub Date : 2025-02-20 DOI:10.1016/j.cartre.2025.100484

Emilia Villegas , Antonio Diaz-Barrios , Gema González , Johnny Chimborazo , Carlos Reinoso , Manuel Caetano , Lola de Lima , Jules Gardener , Guillermo Solorzano

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Abstract

This research consistsof the preparation and luminescence assessment of hybrid materials made by mixing carbon quantum dots (CQDs) obtained, by a hydrothermal process, from avocado seeds, and vinyl caprolactam (VCL) based thermo-responsive hydrogels. These hydrogels were made by aqueous emulsion homo polymerization of VCL or by the copolymerization of VCL with polyethylene glycol diacrylate (PEGDA), as crosslinking agent. The hybrid materials, hydrogels and CQDs were characterized by FTIR, Raman and XPS spectroscopies and to determine the particle sizes of the different obtained materials either High Resolution Transmission Electron Microscopy (HR-TEM) or Dynamic Light Scattering (DLS) were used. It was found that the combination of the VCL based hydrogels with carbon dots causes an enhancement on the photoluminescence when compared with the bare CQDs. Moreover, an increase in the crosslinking degree of the hydrogel polymeric gel corresponded to more enhancement in the photoluminescence intensity of the hybrid materials. The aforementioned luminescent performance and the biocompatible properties of its components position these materials as potential biomedical thermo-responsive sensors

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热响应型乙烯基己内酰胺水凝胶基质上碳量子点的增强发光性能

本研究包括用水热法从鳄梨种子中获得的碳量子点（CQDs）和乙烯基己内酰胺（VCL）热响应水凝胶混合制成的杂化材料的制备和发光评价。这些水凝胶是由VCL的水乳液同源聚合或由VCL与聚乙二醇二丙烯酸酯（PEGDA）作为交联剂共聚而成。采用FTIR、拉曼光谱和XPS光谱对混合材料、水凝胶和CQDs进行了表征，并利用高分辨率透射电镜（HR-TEM）和动态光散射（DLS）测定了不同材料的粒径。研究发现，与裸CQDs相比，VCL基水凝胶与碳点的结合使CQDs的光致发光增强。此外，水凝胶聚合物凝胶交联度的增加对应于杂化材料的光致发光强度的增强。上述发光性能及其组分的生物相容性使这些材料成为潜在的生物医学热响应传感器

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