Counting Single Rhodamine 6G Dye Molecules in Organosilicate Nanoparticles

Area of Science:

• Materials Science
• Nanotechnology
• Spectroscopy

Background:

• Rhodamine 6G (R6G) is a widely used fluorescent dye but suffers from limited thermal and chemical stability.
• Organosilicate nanoparticles offer a promising matrix for encapsulating and protecting dye molecules.
• Understanding the loading and photophysical properties of dyes within nanoparticles is crucial for advanced applications.

Purpose of the Study:

• To embed Rhodamine 6G (R6G) dye molecules into organosilicate nanoparticles.
• To enhance the thermal and chemical stability of R6G.
• To accurately determine the number of R6G molecules per nanoparticle using optical single-particle microscopy.

Main Methods:

• Embedding R6G dye molecules into organosilicate nanoparticles.
• Utilizing optical single-particle microscopy to analyze fluorescence intensity.
• Performing ensemble measurements for complementary characterization.
• Analyzing the blinking behavior of embedded R6G.

Main Results:

• Successful embedding of R6G into organosilicate nanoparticles.
• Optical single-particle microscopy determined an average of 1.3-1.7 R6G molecules per nanoparticle.
• Ensemble measurements indicated no significant R6G aggregate formation.
• Blinking behavior of embedded R6G followed a power law with exponent α(on/off) = -1.7.

Conclusions:

• Organosilicate nanoparticles effectively enhance the stability of Rhodamine 6G dye.
• Optical single-particle microscopy provides a more accurate quantification of dye loading than ensemble methods.
• The hybrid nanoparticles show potential for improved fluorescent marker applications due to controlled dye loading and stability.