Journal
ADVANCED SCIENCE
Volume 7, Issue 11, Pages -Publisher
WILEY
DOI: 10.1002/advs.201903708
Keywords
3D nanostructures; air gaps; scatterers; smart windows; stretchable nanocomposites
Categories
Funding
- Multi-Ministry Collaborative R&D Program (Development of Techniques for Identification and Analysis of Gas Molecules to Protect Against Toxic Substances) through the National Research Foundation of Korea (NRF) - KNPA
- MSIT
- MOTIE
- ME
- NFA [2017M3D9A1073501]
- NRF of the Korea Government (MSIP) [2016R1E1A1A01943131]
- Center for Advanced Soft-Electronics, Ministry of Science, ICT and Future Planning as Global Frontier Project [CASE-2013M3A6A5073173]
- National Research Foundation of Korea (NRF) grant - Korea Government (MSIT) [2018R1A2A1A05019453]
- National Research Foundation of Korea [2016R1E1A1A01943131] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The realization of high-contrast modulation in optically transparent media is of great significance for emerging mechano-responsive smart windows. However, no study has provided fundamental strategies for maximizing light scattering during mechanical deformations. Here, a new type of 3D nanocomposite film consisting of an ultrathin (approximate to 60 nm) Al2O3 nanoshell inserted between the elastomers in a periodic 3D nanonetwork is proposed. Regardless of the stretching direction, numerous light-scattering nanogaps (corresponding to the porosity of up to approximate to 37.4 vol%) form at the interfaces of Al2O3 and the elastomers under stretching. This results in the gradual modulation of transmission from approximate to 90% to 16% at visible wavelengths and does not degrade with repeated stretching/releasing over more than 10 000 cycles. The underlying physics is precisely predicted by finite element analysis of the unit cells. As a proof of concept, a mobile-app-enabled smart window device for Internet of Things applications is realized using the proposed 3D nanocomposite with successful expansion to the 3 x 3 in. scale.
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