Quantum yield in polymer wrapped single walled carbon nanotubes: a computational model

Area of Science:

• Materials Science
• Quantum Chemistry
• Nanotechnology

Background:

• Single-walled carbon nanotubes (SWCNTs) exhibit photoluminescence, but their quantum yield is sensitive to surface modifications.
• Polymer wrapping is a common strategy to functionalize SWCNTs, potentially altering their optical properties.
• Understanding exciton decay pathways is crucial for optimizing SWCNT-based optoelectronic devices.

Purpose of the Study:

• To computationally investigate the quantum yield of polymer-wrapped SWCNTs.
• To analyze the influence of polymer chemistry and wrapping angle on exciton decay.
• To provide insights into photoluminescence data interpretation for functionalized SWCNTs.

Main Methods:

• A 2D model of exciton decay incorporating non-radiative channels was employed.
• The model considered exciton quenching by SWCNT ends and the effects of polymer wrapping.
• Analytical solutions for zero-angle wrapping and numerical solutions for the general case were used.

Main Results:

• The study found that the wrapping angle of the polymer has no significant influence on the quantum yield.
• Exciton decay was modeled considering diffusive motion across the nanotube surface.
• Computed quantum yield values span a range relevant to experimental observations.

Conclusions:

• The wrapping angle is not a critical parameter for determining the quantum yield in polymer-wrapped SWCNTs.
• The computational model provides a framework for understanding photoluminescence in these systems.
• Results can guide the selection of polymers for specific SWCNT applications based on their photoluminescence properties.