Metallic plasmonic nanofluids have been adopted to enhance the photothermal conversion in direct absorption solar thermal collectors, however, their absorption band is not broad enough to realize a sufficient adsorption. Driven by the Local Surface Plasmon Resonance (LSPR) effect, this work explores the enhancement of triangular nanosheets in photothermal conversion, to facilitate the optimization of blended nanofluids. Firstly, the size effects of triangular nanoparticles on photothermal conversion are examined using the Discrete Dipole Approximation method. Then, the blended nanofluids based on silver triangular nanosheets and gold nanorods, is proposed and a high efficiency of 76.9% was achieved experimentally with a very low volume concentration (0.0001%). The enhancement mechanism is revealed furtherly by numerically investigating the electric field excited. We believe that this work can shed light on the design of blended nanofluids based on triangular nanosheets for solar energy harvest.

金属等离激元纳米流体已被采用来增强直接吸收式太阳能集热器中的光热转化，但是，它们的吸收带不足以实现足够的吸收。在局部表面等离子体共振（LSPR）效应的驱动下，这项工作探索了光热转化中三角形纳米片的增强，以促进混合纳米流体的优化。首先，使用离散偶极近似法研究了三角形纳米颗粒对光热转化的尺寸影响。然后，提出了基于银三角形纳米片和金纳米棒的混合纳米流体，并以非常低的体积浓度（0.0001％）通过实验获得了76.9％的高效率。通过数值研究激发的电场进一步揭示了增强机理。我们相信这项工作可以为基于三角形纳米片的太阳能收集用混合纳米流体的设计提供启发。