Self-Controlled Automated Strategy for the Synthesis of Gold Nanorods With Fine-Tuned Longitudinal Absorption

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Reproducibility challenges plague current synthetic strategies for metal nanostructures, hindering production and research.
• Existing methods rely on rigid, time-sensitive protocols susceptible to experimental fluctuations.

Purpose of the Study:

• To develop an innovative, automated, and self-correcting strategy for synthesizing precisely tuned gold nanorods.
• To address the limitations of current synthetic methods by improving flexibility and reproducibility.

Main Methods:

• A novel strategy involving fast, controlled oxidation of precursor gold nanorods (AuNRs).
• Real-time monitoring of optical properties to guide selective etching via oxidant addition.
• Automated process with online control and oxidizer quenching for reaction termination.

Main Results:

• Successfully synthesized precisely tuned gold nanorods with controllable aspect ratios.
• Demonstrated selective etching and removal of byproducts from nonpurified nanorod dispersions.
• Achieved stable nanorod dispersions through effective oxidizer quenching.

Conclusions:

• The proposed automated and self-correcting strategy significantly enhances the reproducibility of gold nanorod synthesis.
• This flexible approach allows for precise tuning and production of gold nanostructures from variable starting materials.
• The method offers a robust solution for scalable and reliable synthesis of metal nanostructures.