Sub-micron scale patterning of fluorescent silver nanoclusters using low-power laser

Area of Science:

• Materials Science
• Nanotechnology
• Photochemistry

Background:

• Noble metal nanoclusters offer tunable properties but lack stability.
• Stabilization is crucial for retaining their enhanced functionality.

Purpose of the Study:

• To develop a facile synthesis for photostable silver nanoclusters.
• To investigate nanocluster formation stages.
• To demonstrate cost-effective fabrication of fluorescent silver nanocluster barcodes.

Main Methods:

• Visible light photoreduction for silver nanocluster synthesis.
• Absorption and fluorescence spectroscopy.
• Fluorescence microscopy and atomic force microscopy.
• Laser-based fabrication of microstructures.

Main Results:

• Achieved highly photostable silver nanoclusters in polymer thin films.
• Detailed investigation of nanocluster formation stages.
• Demonstrated fabrication of micron-sized fluorescent silver nanocluster barcodes using low-power laser.
• Identified low laser power (0.75 mW) sufficient for writing fluorescent structures.

Conclusions:

• Visible light photoreduction is an effective method for synthesizing photostable silver nanoclusters.
• Laser-written silver nanocluster microstructures are suitable for direct labeling.
• Applications include authenticity marking and fluorescent labeling.