Abstract

Optical absorptions, electron–phonon interactions, and thermal conductances at the interface are the key factors for excellent photothermal (PT) agents. To simultaneously enhance them, Au‐cored carbon nanospheres show high photothermal energy conversion efficiency. A broadband enhancement in optical absorption is acquired by broadening the size distribution of the Au cores, and hot electron–phonon interactions are reinforced through plasmon–phonon couplings. The conversion efficiency of the composites is found to be as high as 33.84%, which is improved by 73.8 and 405% compared to the pure carbon spheres and Au nanoparticles (NP), respectively. The Au‐carbon core‐shell nanospheres, acting as a general design of solar‐driven photothermal agent, have a unique property of effectively heating of bulk surroundings, and they can be extensively applied to solar‐driven energy and sustainable development in the future.

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