Cellular interfaces with hydrogen-bonded organic semiconductor hierarchical nanocrystals

Area of Science:

• Bioelectronics
• Materials Science
• Nanotechnology

Background:

• Forming effective bioelectronic interfaces requires close cell-semiconductor contact while maintaining cell viability and semiconductor function.
• Existing methods face challenges in achieving high surface-area contact without compromising cellular or material integrity.

Purpose of the Study:

• To develop novel organic semiconductor assemblies for creating intimate bioelectronic interfaces.
• To investigate the photostimulation capabilities of these assemblies on single cells.

Main Methods:

• Synthesized hierarchical nanocrystal assemblies from nontoxic quinacridone using a colloidal chemical route.
• Controlled nanocrystal size and shape at room temperature by tuning synthesis parameters.
• Created "hedgehog"-shaped crystals with nanoscale needles for enhanced cell contact.

Main Results:

• Achieved intimate interfaces between quinacridone nanocrystals and cell membranes with minimal gaps.
• Demonstrated effective cellular photostimulation upon light excitation of the bioelectronic interface.
• Observed reversible light-induced conductance changes in cellular ion channels.

Conclusions:

• Biomimetic, hierarchical quinacridone nanocrystal assemblies enable high-surface-area contact with cells.
• These nanomaterials facilitate light-controlled cellular behavior through effective photostimulation.
• The developed approach offers a promising strategy for advancing bioelectronic devices and cellular control.