Light‐Responsive Colloidal Crystals Engineered with DNA
Abstract
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 (Tm) 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 Tm window over which these structures are light‐responsive.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 15, 2020
- Source ID
- 10.1002/adma.201906600
Entities
People
- Byeongdu Lee
- Chad Mirkin
- George C. Schatz
- Haixin Lin
- Jinghan Zhu
- Jingshan Du
- Kacper Skakuj
- Muwen Yang
- Richard P. Van Duyne
- Youngeun Kim
Organizations
- Air Force Office of Scientific Research
- Argonne National Laboratory
- International Institute for Nanotechnology
- National Cancer Institute
- National Science Foundation
- Northwestern University
- Office of Basic Energy Sciences
- Office of Naval Research
- Office of Science
- Sherman Fairchild Foundation
- United States Department of Energy