Stöber method to amorphous metal-organic frameworks and coordination polymers.

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• The Stöber method is a key technique for synthesizing amorphous silica (SiO2) colloids and coatings.
• Current limitations restrict the Stöber method to specific material systems.
• Expanding its applicability to diverse frameworks is crucial for advanced materials development.

Purpose of the Study:

• To adapt and extend the Stöber method for synthesizing amorphous metal-organic frameworks (MOFs) and coordination polymers (CPs).
• To develop a general synthesis route for amorphous MOFs/CPs with controlled growth kinetics.
• To demonstrate the creation of core-shell colloids and multifunctional nanostructures using this technology.

Main Methods:

• Mimicking the Stöber method using a base-vapor diffusion technique for controlled synthesis.
• Synthesizing amorphous coordination polymer (CP) colloids using various metal ions and organic ligands.
• Developing conformal amorphous MOF coatings on functional nanoparticles (NPs) to create core-shell structures.

Main Results:

• Successfully synthesized 24 different amorphous CP colloids.
• Created over 100 core-shell composites using 20 amorphous CP shells and over 30 different NPs.
• Produced multifunctional nanostructures like yolk-amorphous MOF shells and core@metal oxides/carbon via transformation.

Conclusions:

• The base-vapor diffusion method effectively extends the Stöber approach to MOFs and CPs.
• This platform enables systematic design of functional and complex colloidal nanomaterials.
• The developed technology offers versatile applications in creating advanced core-shell structures and multifunctional nanodevices.