Pt-Coated Silicon Nanoparticles: An Investigation into the Hydrosilylation on Hydrogen-Terminated Silicon Surfaces
Pooria Golvari1, Khaled Alkameh1, Azina Rahmani1
1Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|June 16, 2023
Summary
This study shows platinum nanoparticles on silicon nanoparticles at room temperature enable facile synthesis. Higher temperatures promote hydrosilylation reactions on silicon nanoparticle surfaces.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Hydrogen-terminated silicon nanoparticles (H-SiNPs) are versatile nanomaterials.
- Karstedt's catalyst is a platinum-based catalyst widely used in silicon chemistry.
- Understanding the interaction between H-SiNPs and Karstedt's catalyst is crucial for developing new synthetic routes.
Purpose of the Study:
- To investigate the interaction between H-SiNPs and Karstedt's catalyst at different temperatures.
- To explore the synthesis of platinum-loaded SiNPs (Pt-SiNPs) and their potential for ligand exchange.
- To determine reaction conditions favoring hydrosilylation on H-SiNPs.
Main Methods:
- Fourier transform infrared spectroscopy (FTIR)
- X-ray photoelectron spectroscopy (XPS)
- Transmission electron microscopy (TEM)
- Energy-dispersive X-ray spectroscopy (EDX)
Main Results:
- At room temperature, Pt(0) oxidative addition onto H-SiNPs is irreversible, immobilizing the catalyst and allowing facile Pt-SiNP synthesis.
- The Pt-on-Si ensemble was characterized using FTIR, XPS, TEM, and EDX.
- Higher temperatures promote catalyst reductive elimination and hydrosilylation of 1-octene on H-SiNPs.
Conclusions:
- Room temperature synthesis provides a facile route to Pt-SiNPs capable of ligand exchange.
- Temperature control is critical for managing catalyst behavior and achieving hydrosilylation.
- The findings offer insights into the surface chemistry of silicon nanoparticles and platinum catalysis.
