Influence of structural defects in nanocubes on solar photothermal conversion

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2026-04-08 DOI:10.1016/j.csite.2026.108028

Shijiang Guo, Xinrong Zhang, Chen Xu, Jia Liu, Xiaohu Wu

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Abstract

The structure of nanoparticles plays a crucial role in tuning optical properties due to flexible surface modification and geometry-dependent spectrum response. Previous studies show that introducing structural defects can enhance plasmonic absorption. Here, we investigate the effects of Au nanocubes and structural defects on optical and photothermal performance. Compared with Au nanospheres, nanocubes red-shift absorption into the near-infrared and support multiple plasmonic resonances, increasing absorption by 6.63% over 300-1500 nm and achieving a solar-weighted absorption fraction of 97.11%, much higher than 80.97% for nanospheres, highlighting their potential for solar applications. Corner defects induce a blue shift of the resonance peak, weaken the second resonance, and increase scattering, reducing near-infrared absorption and solar-weighted absorption to ∼93%. Mid-side defects exhibit higher structural tolerance, enabling multiple resonances, broadening the absorption bandwidth (300-1100 nm), and suppressing scattering, with solar-weighted absorption decreasing slightly to 95.74%–96.92%. Analysis of electric and magnetic fields and thermal power shows local defects enhance fields and excite multiple resonances but do not necessarily increase peak photothermal output, revealing a trade-off between local plasmon excitation and overall performance. This work provides guidance for structural design, defect engineering, and application of Au nanocubes in direct solar thermal absorption systems.

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纳米立方结构缺陷对太阳光热转换的影响

由于纳米粒子的柔性表面修饰和几何相关的光谱响应，纳米粒子的结构在光学性质的调整中起着至关重要的作用。以往的研究表明，引入结构缺陷可以增强等离子体吸收。在这里，我们研究了金纳米立方和结构缺陷对光学和光热性能的影响。与金纳米球相比，纳米立方体的近红外吸收红移，支持多个等离子体共振，在300-1500 nm范围内的吸收增加了6.63%，太阳权重吸收分数达到97.11%，远高于纳米球的80.97%，突出了其在太阳能应用中的潜力。角缺陷导致共振峰蓝移，减弱第二共振，增加散射，使近红外吸收和太阳加权吸收降低到93%。中侧缺陷具有较高的结构容忍度，可以实现多次共振，扩大吸收带宽（300 ~ 1100 nm），抑制散射，太阳加权吸收略有下降，为95.74% ~ 96.92%。对电场、磁场和热功率的分析表明，局部缺陷增强了磁场并激发了多个共振，但并不一定会增加峰值光热输出，这揭示了局部等离子激元激发和整体性能之间的权衡。本研究为金纳米立方在太阳能直接吸热系统中的结构设计、缺陷工程和应用提供了指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.