Sonochemically Assembled Photoluminescent Copper-Modified Graphene Oxide Microspheres

Area of Science:

• Materials Science
• Nanotechnology
• Sonochemistry

Background:

• Developing novel photoluminescent materials is crucial for advanced optical applications.
• Sonochemistry offers a versatile platform for synthesizing complex nanostructures.
• Graphene oxide (GO) and copper-based nanomaterials exhibit unique electronic and optical properties.

Purpose of the Study:

• To develop an accessible sonochemical method for preparing photoluminescent oil-filled silica@CuS/Cu2O/CuO-graphene oxide (GO) microspheres.
• To investigate the photoluminescence mechanisms of the synthesized microspheres.
• To explore the influence of different additives on the photoluminescence properties.

Main Methods:

• Sonochemical assembly utilizing ultrasonic emulsification of a biphasic mixture.
• Preparation of CuS/Cu2O/CuO-GO nanocomposites via sonochemistry.
• Incorporation of nanocomposites into oil-filled silica microspheres with poly(vinyl alcohol) (PVA).

Main Results:

• Successfully synthesized photoluminescent oil-filled silica@CuS/Cu2O/CuO-GO microspheres emitting green, yellow, and red light.
• Photoluminescence attributed to H-bridging between PVA and nanocomposites, light absorption by Cu2O, and charge-transfer insulation by CuO.
• Demonstrated fluorescence quenching by methylene blue due to enhanced adsorption and charge transfer, while malachite green did not induce quenching.

Conclusions:

• The developed sonochemical method is effective for creating tunable, multi-color emitting photoluminescent microspheres.
• The photoluminescence mechanism is linked to the specific composition and interfacial interactions within the microspheres.
• The findings provide insights into designing functional nanomaterials for optical applications.