Marlon S. Ribeiro, Karen C. Ribeiro, Rozane de F. Turchiello, Sergio L. Gómez
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引用次数: 0
摘要
等离子纳米粒子具有显著的光热特性,因此在可再生能源和医学等多个领域具有重要价值。这些光热特性取决于多个因素,包括贵金属类型、粒度和稳定层。本研究探讨了利用紫外线 LED 光化学合成的胶体银纳米粒子的光热特性。研究人员制备了以柠檬酸盐和柠檬酸盐与聚乙烯吡咯烷酮(PVP)组合封端的银纳米粒子。虽然纳米粒子的大小不受柠檬酸盐用量的影响,但非线性折射率却与之相关。随着柠檬酸盐浓度的增加,非线性折射率下降。此外,增加 PVP 的用量不仅会减小纳米粒子的尺寸--这表明紫外线诱导了反向奥斯特瓦尔德熟化过程,而且还会导致光热响应减弱。
Photothermal Properties of Plasmonic Nanofluids Containing Ag Nanoparticles Under Off-Resonant Excitation: The Influence of Capping Agents
Plasmonic nanoparticles exhibit remarkable photothermal properties, making them valuable in various fields such as renewable energy and medicine. These photothermal properties depend on several factors, including the type of noble metal, particle size, and the stabilizing layer. This study investigates the photothermal properties of colloidal silver nanoparticles synthesized photochemically using UV LEDs. Silver nanoparticles capped with citrate and a combination of citrate and polyvinylpyrrolidone (PVP) were prepared. While the nanoparticle size remained unaffected by the amount of citrate, the nonlinear refractive index did show dependence. As the citrate concentration increased, the nonlinear refractive index decreased. Additionally, increasing the amount of PVP not only reduces the nanoparticle size—suggesting a reverse Ostwald ripening process induced by UV light—but also leads to a diminished photothermal response.
期刊介绍:
The Brazilian Journal of Physics is a peer-reviewed international journal published by the Brazilian Physical Society (SBF). The journal publishes new and original research results from all areas of physics, obtained in Brazil and from anywhere else in the world. Contents include theoretical, practical and experimental papers as well as high-quality review papers. Submissions should follow the generally accepted structure for journal articles with basic elements: title, abstract, introduction, results, conclusions, and references.