Photoluminescent and thermo-optical properties of polymeric films doped with carbon dots derived from methyl red

IF 2.6 4区材料科学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of Nanoparticle Research Pub Date : 2025-09-10 DOI:10.1007/s11051-025-06440-w

Lavínia M. Braga, Raul L. Ferreira, Lucas S. Ferreira, Italo N. de Oliveira

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引用次数: 0

Abstract

The present study investigates the effects of carbon dots on the photoluminescent, thermo-optical, and wetting properties of polyvinyl alcohol (PVA) films. By doping PVA with carbon dots derived from methyl red (CD-MR) at different concentrations, fluorescent nanocomposite films are obtained, which exhibit mechanical and wetting properties similar to those of pristine PVA films. Regarding the spectral properties, our results show that the confinement in a polymeric matrix leads to significant changes in the absorption and fluorescence spectra of such carbon dots, where a substantial hypsochromic shift is observed in the CD-MR photoluminescence. Using the time-resolved z-scan technique, the thermo-optical properties of nanocomposite films are also investigated. The CD-MR addition induces a self-defocusing behavior in PVA films, with the thermo-optical coefficient increasing as the concentration of guest nanoparticles is enhanced. Additionally, a gradual reduction in the thermal diffusivity of PVA films is observed, indicating that the addition of nanoparticles affects heat transport in polymeric samples.

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掺杂甲基红碳点聚合物薄膜的光致发光和热光学性能

研究了碳点对聚乙烯醇（PVA）薄膜的光致发光、热光学和润湿性能的影响。用不同浓度甲基红（CD-MR）衍生的碳点掺杂PVA，得到了具有与原始PVA膜相似的机械性能和润湿性能的荧光纳米复合膜。关于光谱性质，我们的研究结果表明，在聚合物基体中的约束导致这种碳点的吸收和荧光光谱发生了显著变化，其中在CD-MR光致发光中观察到实质性的次色移。利用时间分辨z扫描技术，研究了纳米复合膜的热光学性能。CD-MR的加入引起PVA薄膜的自散焦行为，热光学系数随着客体纳米颗粒浓度的增加而增加。此外，观察到PVA薄膜的热扩散系数逐渐降低，表明纳米颗粒的加入影响了聚合物样品中的热传递。

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来源期刊

Journal of Nanoparticle Research 工程技术-材料科学：综合

CiteScore

4.40

自引率

4.00%

发文量

198

审稿时长

3.9 months

期刊介绍： The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size. Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology. The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.