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Angew Chem Int Ed Engl. 2018 May 22;57(21):6289-6293. doi: 10.1002/anie.201801347. Epub 2018 Apr 26.

Thiophene-Fused-Heteroaromatic Diones as Promising NIR Reflectors for Radiative Cooling.

Chen W1,2, Song Y2, Zhang L2, Liu M2, Hu X1,2,3, Zhang Q1,4.

Author information

1
School of Materials Science and Engineering, Nanyang Technological University (Singapore), 639798, Singapore, Singapore.
2
Temasek Laboratories@NTU, Nanyang Technological University (Singapore), Research Techno Plaza, 50 Nanyang Drive, 637553, Singapore, Singapore.
3
Environmental Chemistry & Materials Centre (ECMC), Nanyang Environment and Water Research Institute (NEWRI), Nanyang Technological University, Singapore, Singapore.
4
School Division of Chemistry and Biological Chemistry, School of Physical and Mathematics Science, Nanyang Technological University (Singapore), Singapore, Singapore.

Abstract

Developing appropriate NIR-reflective materials to combat near-infrared (NIR) heat radiation (700-2500 nm) from sunlight, avoiding energy accumulation and reduce energy consumption, is important and highly desirable. In this research, four thiophene-fused-heteroaromatic diones were used as basic reflectors to investigate the relationship between their intrinsic molecular structures and NIR-reflective properties. The reflectance intensity can be readily tuned by adjusting the length of the appended aliphatic side chains, as well as the strength of the electron-donating groups. A methoxy-substituted thiophene-fused-heteroaromatic dione showed the best performance in reflecting NIR, and it was used as a coating for a model glass house. The comparison of the internal temperature difference relative to a control house was measured and the maximum temperature was 12 °C lower than that in the control house.

KEYWORDS:

NIR reflectance; conjugation; radiative cooling; sunlight; thiophenes

PMID:
29624842
DOI:
10.1002/anie.201801347

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