Pt Nanoparticles Supported on a Dynamic Boronate Ester-Based G-quadruplex Hydrogel as a Nanoreactor

Area of Science:

• Biomaterials Science
• Nanotechnology
• Catalysis

Background:

• G-quadruplex structures offer unique self-assembly properties.
• Hydrogels are versatile platforms for nanomaterial synthesis.
• Platinum nanoparticles (Pt NPs) have diverse catalytic applications.

Purpose of the Study:

• To develop a green method for synthesizing and stabilizing Pt NPs using a guanosine-based hydrogel.
• To characterize the structural and mechanical properties of the Pt NP-loaded hydrogel.
• To evaluate the catalytic performance of the Pt NP-hydrogel system.

Main Methods:

• Dynamic boronic ester mediated self-assembly of guanosine.
• In situ synthesis and stabilization of Pt NPs within the hydrogel matrix.
• Characterization using Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), Nuclear Magnetic Resonance (NMR), Fourier-Transform Infrared Spectroscopy (FT-IR), and X-ray Photoelectron Spectroscopy (XPS).
• Mechanical testing via rheology to determine storage modulus (G').
• Catalytic evaluation in hydrogenation reactions of aromatic nitro compounds.

Main Results:

• Formation of a 3D G-quadruplex hydrogel with entangled nanofibrillar networks.
• Successful in situ synthesis of 1.5 nm Pt NPs stabilized on the hydrogel nanofibers.
• Significant increase in hydrogel mechanical stiffness (storage modulus increased from 317.08 Pa to 2250 Pa).
• Demonstrated catalytic activity of the Pt NP-hydrogel system for hydrogenation reactions in aqueous media.

Conclusions:

• The G-quadruplex hydrogel serves as an effective template for green synthesis and stabilization of Pt NPs.
• The Pt NP-embedded hydrogel exhibits enhanced mechanical stability and catalytic efficiency.
• This approach presents a promising avenue for developing advanced catalytic materials using biomolecular self-assembly.