Plasmonic nanofluids based on Janus nanosheets and sandwich-structured nanosheets for solar energy harvest

Tianmi WANG; Guihua TANG

doi:10.11949/0438-1157.20190532

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Plasmonic nanofluids based on Janus nanosheets and sandwich-structured nanosheets for solar energy harvest

Material science and engineering, nanotechnology | 更新时间：2020-06-24

- Plasmonic nanofluids based on Janus nanosheets and sandwich-structured nanosheets for solar energy harvest
- CIESC Journal Vol. 70, Issue S2, Pages: 336-342(2019)
- 作者机构：
  
  西安交通大学能源与动力工程学院热流科学与工程教育部重点实验室，陕西西安 710049
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190532
  CLC： TK 124
- Received：19 May 2019，
  
  Revised：2019-05-27，
  
  Published：05 September 2019
- 稿件说明：
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王甜蜜, 唐桂华. Janus三角纳米片和“三明治”三角纳米片消光特性的数值研究[J]. 化工学报, 2019, 70(S2): 336-342

WANG Tianmi, TANG Guihua. Plasmonic nanofluids based on Janus nanosheets and sandwich-structured nanosheets for solar energy harvest[J]. CIESC Journal, 2019, 70(S2): 336-342
王甜蜜, 唐桂华. Janus三角纳米片和“三明治”三角纳米片消光特性的数值研究[J]. 化工学报, 2019, 70(S2): 336-342 DOI： 10.11949/0438-1157.20190532.

WANG Tianmi, TANG Guihua. Plasmonic nanofluids based on Janus nanosheets and sandwich-structured nanosheets for solar energy harvest[J]. CIESC Journal, 2019, 70(S2): 336-342 DOI： 10.11949/0438-1157.20190532.

摘要

基于离散偶极近似法(DDA)计算了不同组分的Janus三角纳米片和“三明治”三角纳米片的消光特性，两种纳米片在紫外-可见光波段均出现了明显的吸收峰。当纳米片较小时，消光特性主要以吸收为主，当纳米片逐渐增大，散射作用开始明显。当纳米片增大时，吸收峰向长波方向移动并且峰会变宽。二氧化硅与银的组合能在较宽的波段内激发表面等离激元效应，因此波峰比金银组合纳米片的波峰宽，但是吸收峰值较后者低。增加纳米片的层数，或者添加纳米片的组分，可以在一定范围内对纳米片的消光特性进行调节，从而提高太阳能光热转换效率。

Abstract

Direct absorption solar thermal collectors (DASC) explore the photo-thermal conversion characteristics of fluids to convert solar radiation into thermal energy. Plasmonic nanofluids have been used to improve the efficiency of DASC as working fluids

because of the localized surface plasmon resonance (LSPR) effect excited on the surface of metallic nanoparticles. Recently

Janus materials have witnessed fast development due to their diversified promising performances and practical applications. Compared with their spherical counterparts

Janus nanosheets have gained more concerns for their highly anisotropic shape. Herein

the discrete dipole approximation (DDA) is employed to calculate the extinction characteristics of Janus triangular nanosheets and sandwich-structured triangular nanosheets with different sizes. The results show that the LSPR of Janus nanosheets and sandwich-structured nanosheets can be improved by tuning the size. For Janus nanosheets

the thickness plays an important role on the resonance strength

whereas it has little effect on resonance frequency. On the contrary

the resonance strength and resonance frequency of sandwich-structured nanosheets can be influenced by the thickness evidently. Effective control of extinction characteristics can be achieved by varying the relative thickness of each layer of nanosheets

to adjust the extinction peak to the desired band. Optimizing the thickness of the Janus nanosheets and sandwich-structured nanosheets

or combining different sizes of nanosheets

will broaden the effective absorption band

thereby improve the photo-thermal conversion efficiency and the efficiency of direct absorption solar thermal collectors.

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