Four‐Dimensional Deoxyribonucleic Acid–Gold Nanoparticle Assemblies. (28th July 2020) - Luo, Ming
Abstract: Organization of gold nanoobjects by oligonucleotides has resulted in many three‐dimensional colloidal assemblies with diverse size, shape, and complexity; nonetheless, autonomous and temporal control during formation remains challenging. In contrast, living systems temporally and spatially self‐regulate formation of functional structures by internally orchestrating assembly and disassembly kinetics of dissipative biomacromolecular networks. We present a novel approach for fabricating four‐dimensional gold nanostructures by adding an additional dimension: time. The dissipative character of our system is achieved using exonuclease III digestion of deoxyribonucleic acid (DNA) fuel as an energy‐dissipating pathway. Temporal control over amorphous clusters composed of spherical gold nanoparticles (AuNPs) and well‐defined core–satellite structures from gold nanorods (AuNRs) and AuNPs is demonstrated. Furthermore, the high specificity of DNA hybridization allowed us to demonstrate selective activation of the evolution of multiple architectures of higher complexity in a single mixture containing small and larger spherical AuNPs and AuNRs. Abstract : Golden ratio : Four‐dimensional gold (Au) nanostructures were fabricated by a dissipative assembly strategy. The dissipative character of the system was realized by utilizing deoxyribonucleic acid (DNA) as the fuel and exonuclease III (Exo III) as the energy‐dissipating unit, to generate AuNPs functionalized with short single‐stranded DNA oligonucleotides. The assemblies possess surface plasmonic resonance properties.