Tuning the Growth Pattern of Triangular Silver Nanoplates from Lateral to Vertical by Secondary Metal Addition

Area of Science:

• Nanotechnology
• Materials Science
• Physical Chemistry

Background:

• Silver nanobipyramids are important nanomaterials with tunable optical properties.
• Existing synthesis methods can be complex and lack precise control over dimensions.

Purpose of the Study:

• To present an easy, two-step aqueous synthesis for truncated trigonal silver nanobipyramids.
• To demonstrate tunable control over nanobipyramid width and height.

Main Methods:

• Modified seed-mediated growth using particles with twinning faults.
• Co-titration of noble metal salts with silver precursor to control growth.
• In-situ monitoring of particle growth via localized surface plasmon resonance (LSPR) using optical transmission spectroscopy.

Main Results:

• Achieved facile synthesis of truncated trigonal silver nanobipyramids in aqueous solution.
• Demonstrated tunability of nanobipyramid width and height by adjusting noble metal salt concentrations.
• Gained insights into the growth mechanism modification influencing nanobipyramid morphology.

Conclusions:

• The presented method offers a straightforward route to synthesize dimensionally controlled silver nanobipyramids.
• The co-titration strategy effectively modulates lateral and vertical growth, enabling aspect ratio tuning.
• Understanding the growth mechanism provides a basis for further optimization and design of silver nanostructures.