Silica Nanoparticle Architecture Determines Radiative Properties of Encapsulated Fluorophores

Citations Over TimeTop 1% of 2008 papers

Abstract

Silica nanoparticles with embedded fluorescent molecules are used in a variety of applications requiring the observation of single nanoprobes. We describe a class of fluorescent, core–shell silica nanoparticles with a radius of ∼15 nm, narrow particle size distribution, and controlled internal architecture. Particles covalently encapsulating multiple rhodamine molecules are over 20 times brighter than the single dye molecule in water. The photophysical behavior of rhodamine can be manipulated by small changes in the internal architecture of particles with otherwise similar composition, leading to 3-fold enhancement of quantum efficiency per dye with no observable energy transfer between neighboring dyes. This enhancement of quantum efficiency per dye is due to a uniform 2-fold enhancement in radiative rate and a variable reduction in nonradiative rate which varies inversely with the degree of rotational mobility of the dye allowed by the particle architecture. These results demonstrate a practical method for synthesizing highly fluorescent silica nanoparticles and an effective methodology for selectively modifying the photophysical properties of fluorophores.

Related Papers

• → EFFECT OF pH ON PHOTOCATALYTIC ACTIVITIES OF BiOBr NANOMATERIALS SYNTHESIZED BY SONOCHEMICAL METHOD(2020)7 cited
• → A procedure for enriching and cleaning up Rhodamine B and rhodamine WT in natural waters, using a Sep-pak C18 cartridge(1984)19 cited
• → Effect of Inorganic Ions on the Discoloration of Rhodamine B by the Fenton Process(2022)1 cited
• Photocatalytic Degradation of Rhodamine B Solution by ZnO Film(2013)
• → ZnO-Mn nanoparticles synthesized by pulsed laser ablation in liquid for photocatalytic degradation of Rhodamine B(2022)