Department of Chemistry, Assam University, Silchar, 788011, India.
Department of Biotechnology, Assam University, Silchar, 788011, India.
Sci Rep. 2024 Sep 12;14(1):21292. doi: 10.1038/s41598-024-62898-z.
The possibility of coherent manipulation of optical and thermal energies in noble metal nanostructures has given birth to an enduring research arena coined by thermoplasmonics. Upon interaction with electromagnetic radiation, the energy of the produced hot electrons in metallic nanostructures is converted into heat and is transferred to the medium as a consequence of numerous relaxation processes. Gold nanorods have, often, been adopted as the classical anisotropic nanostructures owing to excellent shape-selective plasmonic tunability in the vis-NIR region. When a pair of metallic nanostructures are sufficiently close to each other to imbue electromagnetic interaction, there occurs evolution of collective plasmon modes, substantial enhancement of near field and strong squeezing of electromagnetic energy at the interparticle spatial region of the dimeric nanostructures. Recent advances in the 'tips and tricks' guide to assembling, even, anisotropic nanostructures in colloidal dispersions have offered the opportunity to interplay with the phenomenological plasmonic and thermal characteristics. The photothermal attributes emerging due to electromagnetic coupling of fringing fields have been explored considering parallel and perpendicular configurations of gold nanorod dimers as the prototypical systems from theoretical and experimental perspectives and their biomedical consequences have been realised in a mice model towards the photothermal apoptosis of cancerous cells.
贵金属纳米结构中光学和热能的相干操纵的可能性催生了一个持久的研究领域，即热等离子体学。在与电磁辐射相互作用时，金属纳米结构中产生的热电子的能量被转化为热量，并由于许多弛豫过程而传递到介质中。金纳米棒由于在可见-近红外区域具有优异的形状选择性等离子体可调性，通常被用作经典各向异性纳米结构。当一对金属纳米结构彼此足够接近以赋予电磁相互作用时，会出现集体等离子体模式的演化，近场的大幅增强以及二聚体纳米结构的粒子间空间区域的电磁能的强烈压缩。在胶态分散体中组装各向异性纳米结构的“技巧和窍门”方面的最新进展提供了机会，可以与现象等离子体和热特性相互作用。从理论和实验的角度来看，考虑到金纳米棒二聚体的平行和垂直配置，由于边缘场的电磁耦合而出现的光热特性已经得到了探索，并在小鼠模型中实现了它们在光热诱导癌细胞凋亡方面的生物医学应用。
