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Abstract
Dual plasmonic Au–Ag alloy nanoparticles supported on ordered mesoporous carbon (Au–Ag/CMK-3) have been fabricated by the method of partial substitution of silver on CMK-3 with gold. Near-spherical Ag–Au nanoparticles with a diameter of 8–15 nm are uniformly coated on the surface of CMK-3. Attributed to dual localized surface plasmon resonance (LSPR) effect of Au–Ag alloy nanoparticles, the Au–Ag/CMK-3 composites have remarkable broadband absorption in the visible and near-infrared regions. All CMK-3 based nanofluids show much higher photothermal conversion efficiency than the base liquid of ethylene glycol (EG). Au–Ag alloy nanoparticles further enhance the photothermal conversion efficiency of CMK-3, which is 71.1% compared with 67.4% and 65.6% for Au/CMK-3 and Ag/CMK-3, respectively. The Au–Ag/CMK-3 nanomaterials pay new ways for fabrication promising photothermal nanofluids for application in direct absorption solar collectors.
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