Combined with the solar irradiation spectrum, the optical properties of both TiO 2 /Ag composite nanoparticles and water-based nanofluids composed of different nanoparticles are studied. The solar energy absorption features are compared among these nanofluids based on TiO 2 , Ag and TiO 2 /Ag composite nanoparticles. Due to the localized surface plasmon resonance (LSPR) effect excited on the Ag surface, the optical absorption of TiO 2 /Ag plasmonic nanofluid is remarkably enhanced. The enhanced absorption by LSPR excitation is introduced in solar thermal conversion. The photothermal experiments of different nanofluids conducted under the same conditions reveal that TiO 2 /Ag plasmonic nanofluid exhibits a higher temperature compared with that of TiO 2 based nanofluid. Although the temperatures of Ag nanofluid and TiO 2 /Ag nanofluid are the same, the cost of TiO 2 /Ag based nanofluid is much lower. The effect of nanoparticle concentration on the photothermal performance of TiO 2 /Ag plasmonic nanofluid is also studied in this paper.

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