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Kim, Taesung
Microfluidics & Nanomechatronics Lab (μFNM)
Research Interests
  • Microfluidics & Nanofluidics
  • Nanoscale Transport Phenomena
  • MEMS & BioMEMS
  • Nanofabrication & Nanomechatronics

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Multimodal and Covert-Overt Convertible Structural Coloration Transformed by Mechanical Stress

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Title
Multimodal and Covert-Overt Convertible Structural Coloration Transformed by Mechanical Stress
Author
Zhou, QitaoPark, Jun GyuBae, JuyeolHa, DogyeongPark, JungyulSong, KyungjunKim, Taesung
Issue Date
2020-06
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.32, no.25, pp.2001467
Abstract
Most materials and devices with structurally switchable color features responsive to external stimuli can actively and flexibly display various colors. However, realizing covert-overt transformation behavior, especially switching between transparent and colored states, is more challenging. A composite laminate of soft poly(dimethylsiloxane) (PDMS) with a rigid SiO2-nanoparticle (NP) structure pattern is developed as a multidimensional structural color platform. Owing to the similarity in the optical properties of PDMS and SiO2 NPs, this device is fully transparent in the normal state. However, as their mechanical strengths differ considerably, upon compressive loading, a buckling-type instability arises on the surface of the laminate, leading to the generation of 1D or 2D wrinkled patterns in the form of gratings. Finally, an application of the device in which quick response codes are displayed or hidden as covert-overt convertible colored patterns for optical encryption/decryption, showing their remarkable potential for anticounterfeiting applications, is demonstrated.
URI
https://scholarworks.unist.ac.kr/handle/201301/32300
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/adma.202001467
DOI
10.1002/adma.202001467
ISSN
0935-9648
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