Spectrum-Quantified Morphological Evolution of Enzyme-Protected Silver Nanotriangles by DNA-Guided Postshaping

Area of Science:

• Nanochemistry
• Materials Science
• Biotechnology

Background:

• Quantitative morphological control is crucial in nanochemistry.
• Silver nanotriangles (AgNTs) are important nanomaterials with tunable properties.
• DNA's potential in directing nanomaterial synthesis and modification is an active research area.

Purpose of the Study:

• To quantitatively evolve the morphology of silver nanotriangles (AgNTs) using DNA as a guiding agent.
• To establish a model for tracking the DNA-guided postshaping process of AgNTs.
• To explore the application of this DNA-guided postshaping in designing DNA-mediated biosensors.

Main Methods:

• Preparation of intact AgNTs using horseradish peroxidase.
• Sequential etching of AgNTs by C-rich DNA for postshaping.
• Real-time morphological evolution tracking using spectroscopy.
• Atomically resolved imaging and theoretical simulations to model the process.

Main Results:

• Demonstrated DNA-guided postshaping of AgNTs, yielding specific corner shapes.
• Established a quantitative model to track AgNT morphological evolution.
• Showcased the sequence and structure dual-dependence of DNA-guided postshaping.
• Proposed a mechanism involving metal-base interaction, surface energy, and DNA structural freedom.

Conclusions:

• Developed a precise and quantitative method for controlling anisotropic metallic nanomaterial morphology.
• DNA-guided postshaping offers a versatile platform for nanomaterial design.
• The findings enable the creation of tailored AgNTs for applications like DNA-mediated biosensors.