A self-assembly phase diagram from amphiphilic perylene diimides

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Nanotechnology

Background:

• Supramolecular forces dictate self-assembly and final nanostructure morphologies.
• The precise control mechanisms of these forces on morphology remain largely unexplored.

Purpose of the Study:

• To investigate how secondary forces influence the self-assembled nanostructures of rigid organic semiconductor chromophores.
• To demonstrate fine control over nanostructure morphology by tuning the surrounding environment.

Main Methods:

• Utilized a water/methanol/hydrochloric acid system to create diverse environments.
• Varied water fraction (R(w)) and hydrochloric acid concentration ([HCl]) to observe different self-assembly phases.

Main Results:

• Identified five distinct self-assembled nanostructures: nanotapes, nanoparticles, rigid microplates, soft nanoplates, and hollow nanospheres.
• Established that nanostructure formation is governed by R(w) and [HCl] levels.
• Developed a phase diagram mapping R(w) and [HCl] to specific nanostructures.

Conclusions:

• Demonstrated that secondary forces can finely control self-assembled nanostructure morphology in rigid organic semiconductors.
• The developed phase diagram provides a guide for predictably forming desired nanostructures by adjusting R(w) and [HCl].