核心(AuxAg1- x)-外壳(Au)纳米结构的光学和热光电特性

IF 5.45 Q1 Physics and Astronomy Nano-Structures & Nano-Objects Pub Date : 2024-09-14 DOI:10.1016/j.nanoso.2024.101333
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引用次数: 0

摘要

双金属纳米粒子(NPs)的光学和热光电特性为设计功能材料和创新纳米技术装置提供了广泛的可能性。实验和理论科学研究对双金属纳米粒子的探索兴趣与日俱增。将金(Au)和银(Ag)等贵金属以合金或核/壳排列的形式结合到同一纳米结构中,具有多种优势和潜在应用。本文采用有限元法(FEM)研究了由混合合金(AuxAg1-x)-核和金-壳组成的双金属核/壳纳米球的光学响应和纳米级发热能力。首先,我们通过生成吸收光谱研究了表面等离子体共振(SPR)特性。我们的研究结果表明,这些纳米球的 SPR 峰的位置和振幅受组成核心的金和银金属比例以及金壳厚度的强烈影响。特别是,SPR 峰的位置可在 535 纳米到 1085 纳米之间调整,这取决于这些 NPs 的组成和结构。其次,我们研究了这些 NPs 在连续波(cw)激光或飞秒脉冲(fs-pulsed)激光照射下将吸收的光能转化为热能的能力。结果表明,这些 NPs 能够根据内核成分、金壳厚度、照明强度和照明类型(cw 或 fs-脉冲)控制产生的温度。特别是,在 fs 脉冲照明下,NPs 的内部温度明显高于 cw 照明。这些发现对于这些合金核和金壳纳米粒子在各种热光子学应用中的使用至关重要。
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Optical and thermoplasmonic properties of core (AuxAg1- x)- shell (Au) nanostructures

The optical and thermoplasmonic properties of bimetallic nanoparticles (NPs) offer a wide range of possibilities for designing functional materials and innovative nanotechnological devices. Their exploration is generating increasing interest in experimental and theoretical scientific research. The combination of noble metals such as gold (Au) and silver (Ag) within the same nanostructure, in the form of an alloy or core/shell arrangement, presents several advantages and potential applications. In this paper, the finite element method (FEM) is used to study the optical response and nanoscale heat generation capability of bimetallic core/shell nanospheres composed of a mixed alloy (AuxAg1x)-core and an Au-shell. First, we studied the surface plasmon resonance (SPR) properties by generating absorption spectra. Our results show that the position and amplitude of the SPR peak of these nanospheres are strongly influenced by the fractions of Au and Ag metals composing the core, as well as by the Au-shell thickness. In particular, the SPR-peak position can be adjusted between 535nm and 1085nm depending on the composition and structure of these NPs. Secondly, we studied the ability of these NPs to convert absorbed light into heat when exposed to either a continuous wave (cw) laser or a femtosecond pulsed (fs-pulsed) laser. The results demonstrate the ability to control the temperature generated by these NPs based on the core composition, Au-shell thickness, illumination intensity, and the type of illumination (cw or fs-pulsed). In particular, under fs-pulsed illumination, the internal temperature of the NPs is significantly higher than under cw illumination. These findings are crucial for the use of these alloy-core and Au-shell nanoparticles in various thermoplasmonic applications.

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来源期刊
Nano-Structures & Nano-Objects
Nano-Structures & Nano-Objects Physics and Astronomy-Condensed Matter Physics
CiteScore
9.20
自引率
0.00%
发文量
60
审稿时长
22 days
期刊介绍: Nano-Structures & Nano-Objects is a new journal devoted to all aspects of the synthesis and the properties of this new flourishing domain. The journal is devoted to novel architectures at the nano-level with an emphasis on new synthesis and characterization methods. The journal is focused on the objects rather than on their applications. However, the research for new applications of original nano-structures & nano-objects in various fields such as nano-electronics, energy conversion, catalysis, drug delivery and nano-medicine is also welcome. The scope of Nano-Structures & Nano-Objects involves: -Metal and alloy nanoparticles with complex nanostructures such as shape control, core-shell and dumbells -Oxide nanoparticles and nanostructures, with complex oxide/metal, oxide/surface and oxide /organic interfaces -Inorganic semi-conducting nanoparticles (quantum dots) with an emphasis on new phases, structures, shapes and complexity -Nanostructures involving molecular inorganic species such as nanoparticles of coordination compounds, molecular magnets, spin transition nanoparticles etc. or organic nano-objects, in particular for molecular electronics -Nanostructured materials such as nano-MOFs and nano-zeolites -Hetero-junctions between molecules and nano-objects, between different nano-objects & nanostructures or between nano-objects & nanostructures and surfaces -Methods of characterization specific of the nano size or adapted for the nano size such as X-ray and neutron scattering, light scattering, NMR, Raman, Plasmonics, near field microscopies, various TEM and SEM techniques, magnetic studies, etc .
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