Enhancing Solar Radiant Heat Transfer Using Supersonically Sprayed rGO/AgNW Textured Surfaces

Taegun Kim, Chanwoo Park, Yongil Kim, Ali Aldalbahi, Mohamed El-Newehy, Seongpil An, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A solar air heater absorbs radiation in the visible wavelength range to heat air for the thermal management of buildings. We demonstrate the fabrication of highly textured surfaces using reduced graphene oxide (rGO) nanosheets and silver nanowires (AgNWs) to maximize the collection of solar heat. The textured surface traps light waves efficiently because of the multiple reflections inside the nanoscale grooves. The textured surface functions as an almost perfect black body that traps all the radiation inside a Helmholtz jar via these multiple reflections. A circular copper disk with a thickness of 1 cm was coated with rGO and/or AgNWs, and the total amount of transferred heat was estimated. The thickness of the coated layer was less than 20 μm. This indicates that, compared with that of the copper disk, the thermal conductivity of the layer was negligible. The heat transfer rates of the AgNW-, rGO-, and rGO/AgNW-coated disks were compared with those of the bare substrate (non-coated disk). We observed that the rGO/AgNW hybrid coating produced the highest heat transfer rate because of the optical interactions between the rGO sheets and AgNWs, with the synergetic effect enhancing light scattering at the textured surface.

Original languageEnglish
Pages (from-to)23-33
Number of pages11
JournalInternational Journal of Precision Engineering and Manufacturing - Green Technology
Issue number1
Publication statusPublished - 2023 Jan

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government NRF-2020R1A5A1018153, NRF-2021R1A2C2010530, and 2020K1A3A1A74114847. The authors acknowledge King Saud University, Riyadh, Saudi Arabia, for funding this work through Researchers Supporting Project number (RSP-2021/30).

Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Korean Society for Precision Engineering.


  • Radiation absorber film
  • Radiative heat transfer
  • Reduced graphene oxide
  • Silver nanowires
  • Solar air heater
  • Supersonic cold spraying

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Management of Technology and Innovation


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