A rational biomimetic approach to structure defect generation in colloidal nanocrystals

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Synthesis

Background:

• Controlling nanocrystal (NC) morphology is crucial for applications.
• NC shape is dictated by seed structure and facet growth.
• Strategies for controlling NC defects are less explored than facet control.

Purpose of the Study:

• Investigate peptide-induced twinning in platinum (Pt) NCs.
• Derive principles for designing molecular surfactants for high-yield twinning.
• Apply biomimetic principles to synthesize twinned palladium (Pd) and rhodium (Rh) NCs.

Main Methods:

• Mechanistic investigations of Pt NC growth with specific peptides.
• Analysis of synergistic factors influencing twinned NC formation.
• Design and synthesis of organic molecules mimicking peptide binding motifs.

Main Results:

• Identified peptide-histidine complexation altering Pt reduction kinetics and growth.
• Discovered preferential stabilization of {111} planes in twinned seeds.
• Successfully synthesized single and multiple twinned Pd and Rh NCs using designed molecules.

Conclusions:

• Biomimetic synthesis provides insights into NC defect control.
• Peptide-induced twinning offers a rational strategy for noble metal NC synthesis.
• Biomimetic principles are broadly applicable for tailoring NC properties.