Bipolar Electrode Based Reversible Fluorescence Switch Using Prussian Blue/Au Nanoclusters Nanocomposite Film

Area of Science:

• Electrochemistry
• Nanotechnology
• Materials Science

Background:

• Fluorescence switching systems are crucial for optical sensing and displays.
• Traditional systems often involve complex setups and limited controllability.
• Developing efficient and miniaturized electrical-stimuli responsive fluorescence switches is an ongoing challenge.

Purpose of the Study:

• To propose and demonstrate a novel, highly efficient fluorescence switch system.
• To utilize a closed bipolar electrode (C-BPE) system for simplified control.
• To leverage the interaction between gold nanoclusters (Au NCs) and Prussian blue (PB) for fluorescence modulation.

Main Methods:

• Pre-modification of gold nanoclusters (Au NCs) as a fluorescent donor on a C-BPE.
• Utilizing the inner filter effect between Au NCs and Prussian blue (PB) for fluorescence quenching.
• Employing the reversible redox reaction of PB for fluorescence recovery via voltage switching.

Main Results:

• Achieved a fluorescence "off" state via inner filter effect quenching.
• Demonstrated fluorescence recovery ("on" state) by switching PB's redox state.
• Obtained an on-off ratio of 2.7 with good fatigue resistance over 10 cycles.
• Showcased a simplified and controllable system compared to traditional three-electrode setups.

Conclusions:

• The proposed C-BPE system offers a simple and controllable approach for electrical-stimuli responsive fluorescence switching.
• This work provides a new route for designing miniaturized fluorescence switch devices.
• The system's efficiency and stability make it promising for future applications in integrated devices.