Au nanoparticles supported on Bi2WO6 nanosheets for broad-band absorption and good solar thermal conversion

  • Min Wang
  • Lingling Wang
  • Wei YuEmail author
  • Huaqing Xie


Photothermal conversion is one of the most effective ways of absorbing and utilizing solar energy. The key issues of photothermal conversion are seeking for nanofluids with strong and wide-range sunlight harvesting. In this work, near-infrared (NIR) light absorbed Bi2WO6 is first exploited for solar thermal conversion. However, the photothermal conversion efficiency is low owing to its insufficient NIR-light absorption. After coating Au nanoparticles on Bi2WO6 nanosheets, the localized surface plasmon resonance effect of Au nanoparticles enable Bi2WO6 show strong optical absorption. Au/Bi2WO6–H2O nanofluids have higher temperature rise and better photothermal conversion efficiency than Bi2WO6 and the base fluid water. The present work not only explore a new way for improving the photothermal conversion efficiency of NIR-light nanofluids, but also help design and prepare novel broad-band sunlight absorption nanofluids.

List of symbols


Mass of nanofluids (g)


The initial temperature (°C)


Illumination time (s)


The intensity of the solar light (W∙m−2)


Wavelength (nm)


Spectral solar irradiance


Transmittance per unit wavelength


The extinction coefficient


Penetration distance (cm)


Specific heat (J/(kg × °C))


The instantaneous temperatures (°C)


Optical length (cm)


Photo-thermal conversion efficiency


Area exposed to solar irradiation (m2)


Solar weighted absorption coefficient


Transmittance coefficient


The spectral solar irradiance



This work was supported by National Natural Science Foundation of China (Grant Nos. 51590901, and 51876112), Shanghai Municipal Natural Science Foundation (Grant No. 17ZR1411000), the Key Subject of Shanghai Polytechnic University (Material Science and engineering, XXKZD1601 and EGD18YJ0042), the Graduate Program Foundation of Shanghai Polytechnic University (Grant No. EGD18YJ0051), the Gaoyuan Discipline of Shanghai-Environmental Science and Engineering (Resource Recycling Science and Engineering).


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Authors and Affiliations

  1. 1.School of Environmental and Materials Engineering, College of EngineeringShanghai Polytechnic UniversityShanghaiChina
  2. 2.Research Center of Resource Recycling Science and EngineeringShanghai Polytechnic UniversityShanghaiChina

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