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Light‐Responsive Colloidal Crystals Engineered with DNA
Author(s) -
Zhu Jinghan,
Lin Haixin,
Kim Youngeun,
Yang Muwen,
Skakuj Kacper,
Du Jingshan S.,
Lee Byeongdu,
Schatz George C.,
Van Duyne Richard P.,
Mirkin Chad A.
Publication year - 2020
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.201906600
Subject(s) - azobenzene , materials science , photoisomerization , nanoparticle , self assembly , molecule , nanotechnology , colloid , colloidal crystal , colloidal gold , chemical engineering , polymer , organic chemistry , isomerization , catalysis , composite material , chemistry , engineering
A novel method for synthesizing and photopatterning colloidal crystals via light‐responsive DNA is developed. These crystals are composed of 10–30 nm gold nanoparticles interconnected with azobenzene‐modified DNA strands. The photoisomerization of the azobenzene molecules leads to reversible assembly and disassembly of the base‐centered cubic (bcc) and face‐centered cubic (fcc) crystalline nanoparticle lattices. In addition, UV light is used as a trigger to selectively remove nanoparticles on centimeter‐scale thin films of colloidal crystals, allowing them to be photopatterned into preconceived shapes. The design of the azobenzene‐modified linking DNA is critical and involves complementary strands, with azobenzene moieties deliberately staggered between the bases that define the complementary code. This results in a tunable wavelength‐dependent melting temperature ( T m ) window (4.5–15 °C) and one suitable for affecting the desired transformations. In addition to the isomeric state of the azobenzene groups, the size of the particles can be used to modulate the T m window over which these structures are light‐responsive.