pH-responsive, DNA-directed reversible assembly of graphene oxide

Area of Science:

• Materials Science
• Nanotechnology
• Biomaterials Engineering

Background:

• Graphene oxide (GO) and DNA are versatile building blocks for nano/microdevices and hybrid structures.
• Reversible assembly of these nanomaterials is crucial for applications in sensors, energy storage, catalysis, and optoelectronics.
• Achieving reversible assembly of GO-DNA hybrids based on specific DNA hybridization and conformational changes remains a challenge.

Purpose of the Study:

• To report a general pH-responsive, DNA-directed assay for reversible assembly of GO-based hybrid materials.
• To demonstrate the use of human telomeric G-quadruplex and i-motif DNA for controlled assembly.
• To enable the creation of dynamic GO-GO and GO-AuNPs hybrid structures.

Main Methods:

• Utilized pH-responsive G-quadruplex and i-motif DNA structures.
• Employed DNA-directed self-assembly principles.
• Investigated the reversible assembly of graphene oxide (GO) with itself and with gold nanoparticles (AuNPs).

Main Results:

• Successfully demonstrated a general pH-responsive, DNA-directed method for reversible nanomaterial assembly.
• Achieved reversible assembly of GO-GO and GO-AuNPs hybrid structures.
• Showcased the potential of G-quadruplex and i-motif DNA in controlling hybrid material configurations.

Conclusions:

• The developed assay provides a novel strategy for designing reversible GO-DNA hybrid nanomaterials.
• This approach offers dynamic control over nanostructure formation, applicable to various advanced fields.
• The pH-responsive DNA sequences enable tunable and reversible assembly, paving the way for sophisticated nanomaterial applications.