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所属单位：能源与动力学院

发表刊物：SOLAR ENERGY

关键字：Solar thermal conversion Localized surface plasmon resonance Core-shell Plasmonic nanofluids

摘要：Plasmonic nanoshell-based nanofluids have recently been demonstrated to be promising candidates for efficient solar thermal conversion. During the nanoshells' fabrication processes, more often than not, only part of the dielectric core is covered by metals. However, there are few reports on how these particle defects affect the solar thermal conversion. In this paper, we find that the coverage defects of TiO2/Ag nanoshells, instead of deteriorating, may enhance the solar absorption of nanofluids. The underlying mechanism mainly lies in the redshift of the symmetric localized surface plasmon resonance from the visible region for perfect nanoshells to the near-infrared in the presence of particle defects. The poor absorption of perfect nanoshells based nanofluids in the near-infrared is thus improved. The redshift can be quantitatively predicted and understood by an effective medium approach. This work opens a new route to enhance the solar thermal conversion of nanofluids by mediating the resonance absorption of composite nanoparticles via defects, and helps to deepen the understanding of plasmonic absorption properties of non-perfect nanoshells. (C) 2017 Elsevier Ltd. All rights reserved.

ISSN号：0038-092X

是否译文：否

发表时间：2017-04-01

合写作者：宣益民

通讯作者：宣益民,刘向雷