Journal
NANO LETTERS
Volume 20, Issue 10, Pages 6974-6980Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01457
Keywords
radiative cooling; plasmon resonance; thermal emission; semiconductor nanoparticle; nanocomposites
Categories
Funding
- National Key R&D Program of China [2017YFA0305500]
- National Science Foundation of China [11604152]
- Natural Science Foundation of Jiangsu Province [SBK2020030142, BK20160815, BK20181079, BK20190443]
- Fundamental Research Funds for the Central Universities [30919011298, 30919011299]
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Radiative cooling, a passive cooling technique, has shown great potentials in recent years to lower the power consumption of air conditioning. With the ever-increasing cooling power being reported, the theoretical cooling limit of such a technique is still unclear. In this work, we proposed a theoretical limit imposing an upper bound for the attainable cooling power. To approach this limit, we exploited the localized surface plasmon resonance (LSPR) of self-doped In2O3 nanoparticles, which enhance the emissivity in both primary and secondary atmospheric windows. The measured cooling power of poly(methyl methacrylate) (PMMA) films containing 4.5% In2O3 nanoparticles is very close to the limit with the closest value only about 0.4 W/m(2) below the limit. Hopefully, this work may help the researchers better evaluating the performance of their device in the future and pave the way for achieving even higher radiative cooling powers during the daytime operations with the help of LSPR.
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