Optical absorption property and photo-thermal conversion performance of Ag@Al2O3 plasmonic nanofluids with Al2O3 nano-shell fabricated by atomic layer deposition

被引:26
作者
Shang, Lu [1 ]
Qu, Jian [1 ]
Wang, Zhihao [1 ]
Zhang, Meng [1 ]
Li, Changfeng [1 ]
机构
[1] Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Jiangsu, Peoples R China
关键词
Plasmonic nanofluid; Atomic layer deposition; Direct absorption solar collector; Photo-thermal conversion performance; LSPR effect; SOLAR THERMAL-CONVERSION; THERMOOPTICAL PROPERTIES; HYBRID NANOFLUIDS; ENERGY; NANOPARTICLES; ENHANCEMENT; COLLECTOR; SUSPENSIONS; GENERATION; EFFICIENCY;
D O I
10.1016/j.molliq.2021.115388
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper, Ag@Al2O3 nanoparticles (NPs) were prepared through the atomic layer deposition (ALD) technique with Al2O3 nano-layers serving as anti-corrosion encapsulants. Then, the core-shell structured nano-composites were dispersed into Therminol 66 (TH66) to form oil-based plasmonic nanofluids with mass concentrations varied from 0 to 0.04 wt%. The suspension stability, optical absorption properties and photo-thermal conversion performance of oil-based nanofluids were experimentally tested and evaluated. Besides, the finite difference time domain method was used to simulate the optical absorption of Ag@Al2O3 NPs with different core-shell sizes and volume concentrations. Results demonstrated that the optical absorption capability of oil-based plasmonic nanofluids was enhanced with increasing the nanomaterial concentration. At the approximate optimum concentration of 0.04 wt%, the temperature of plasmonic nanofluid could be increased up to 90.5 degrees C after an irradiation time of 45 min at the solar intensity of 920W/m(2). The deposition of Al2O3 layer can enhance the optical absorption by intensifying and broadening the absorbance spectras of Ag NPs accompanied by red-shift due to the localized surface plasmon resonance (LSPR) effect. This study provides a promising option to produce plasmonic Ag@ Al2O3 nano-composites at large scale for applications in solar thermal energy harvesting. (C) 2021 Elsevier B.V. All rights reserved.
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页数:8
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