DNA origami deposition on native and passivated molybdenum disulfide substrates

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• DNA origami offers precise nanoscale fabrication for hybrid devices.
• Molybdenum disulfide (MoS₂) is a promising substrate for electronic and biomedical sensors due to its unique properties.
• Maintaining structural integrity of DNA origami on substrates is crucial for device functionality.

Purpose of the Study:

• To investigate the interaction between DNA origami and molybdenum disulfide (MoS₂) surfaces.
• To explore surface modifications for preserving DNA origami structure on MoS₂.
• To assess the potential of DNA origami/MoS₂ hybrids in biomedical sensing.

Main Methods:

• Studied DNA origami interaction with MoS₂ surfaces.
• Compared DNA origami behavior on MoS₂ versus mica.
• Evaluated pyrene and 1-pyrenemethylamine as surface modifiers for MoS₂.
• Analyzed structural integrity using microscopy techniques.

Main Results:

• DNA origami structures rapidly lose integrity upon direct contact with MoS₂.
• Unlike mica, MoS₂ does not preserve DNA origami structural fidelity.
• 1-pyrenemethylamine forms a protective adsorption layer on MoS₂, significantly enhancing structural preservation.
• Pyrene also forms an adsorption layer but offers less protection than 1-pyrenemethylamine.

Conclusions:

• Direct interaction with MoS₂ is detrimental to DNA origami structural integrity.
• Surface modification, particularly with 1-pyrenemethylamine, is essential for successful integration of DNA origami with MoS₂.
• These findings pave the way for fabricating robust DNA origami/MoS₂ hybrid electronic devices.