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Responsive Block Copolymer Photonic Microspheres
Author(s) -
Yang Yi,
Kim Hodae,
Xu Jiangping,
Hwang MinSoo,
Tian Di,
Wang Ke,
Zhang Lianbin,
Liao Yonggui,
Park HongGyu,
Yi GiRa,
Xie Xiaolin,
Zhu Jintao
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201707344
Subject(s) - materials science , structural coloration , copolymer , lamellar structure , photonics , nanotechnology , refractive index , self assembly , metamaterial , microsphere , optoelectronics , photonic crystal , polymer , chemical engineering , composite material , engineering
Responsive photonic crystals (PCs) have attracted much attention due to their broad applications in the field of chemical and physical sensing through varying optical properties when exposed to external stimuli. In particular, assembly of block copolymers (BCPs) has proven to be a robust platform for constructing PCs in the form of films or bulk. Here, the generation of BCPs photonic microspheres is presented with 3D periodical concentric lamellar structures through confined self‐assembly. The structural color of the spherical PCs can be tuned by selective swelling of one block, yielding large change of optical property through varying both layer thickness and refraction index of the domains. The as‐formed spherical PCs demonstrate large reflection wavelength shift (≈400–700 nm) under organic solvent permeation and pH adjustment. Spherical shape and structural symmetry endow the formed spherical PCs with rotation independence and monochrome, which is potentially useful in the fields of displays, sensing, and diagnostics.