Surface modification of self-assembled one-dimensional organic structures: white-light emission and beyond

Area of Science:

• Materials Science
• Organic Chemistry
• Nanotechnology

Background:

• Surface modification is crucial for functionalizing micro-/nanostructures.
• Current methods are limited to robust inorganic compounds, excluding fragile organic materials.

Purpose of the Study:

• To develop a facile method for modifying the surface of fragile organic 1D microstructures.
• To demonstrate the grafting of functional molecules onto organic microstructures without causing damage.

Main Methods:

• Designed bulk molecules and surface modifiers with orthogonal solubility for protection.
• Utilized a heterophase S(N)2 reaction to graft red chromophores onto blue-emissive microwires.
• Employed fluorescent lifetime mapping to visualize spatial distribution and confirm core-shell structure.

Main Results:

• Successfully modified fragile organic 1D microstructures.
• Created white-light-emitting 1D microstructures by combining blue-emissive cores with red chromophore shells.
• Confirmed a core-shell structure using advanced imaging techniques.

Conclusions:

• The developed method enables postfunctionalization of organic 1D structures.
• This technique opens possibilities for applications like organic P-N junctions and biosensors.
• Orthogonal solubility is key to protecting delicate organic crystals during surface modification.