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Platinum nanoparticles generated in functionality-enhanced reaction media based on polyoctadecylsiloxane with

Eleonora V Shtykova¹, Dmitri I Svergun, Dmitri M Chernyshov

¹Institute of Crystallography, Russian Academy of Sciences, Leninsky pr. 59, 117333 Moscow, Russia, EMBL, Hamburg Outstation, Notkestrasse 85, D-22603 Hamburg, Germany, Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilov St. 28, Moscow 117813, Russia, Departments of Chemical Engineering and Materials Science & Engineering, North Carolina State University, Raleigh, North Carolina 27695, and Department of Chemistry, Indiana University, Bloomington, Indiana 47405.

The Journal of Physical Chemistry. B

|October 28, 2008

Summary

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This study demonstrates using functionalized nanostructured matrices to grow platinum nanoparticles. The matrices guide nanoparticle formation along specific layers, influencing their final structure and aggregation.

Area of Science:

Materials Science
Nanotechnology
Catalysis

Background:

Developing novel nanostructured matrices is crucial for controlling nanoparticle synthesis.
Polyoctadecylsiloxane (PODS) matrices offer a tunable platform for creating ordered nanostructures.
Understanding matrix-nanoparticle interactions is key to designing advanced materials.

Purpose of the Study:

To investigate the use of functionalized PODS matrices as reaction media for platinum (Pt) nanoparticle growth.
To characterize the structural changes within PODS matrices upon incorporation of platinum precursors.
To correlate matrix structure with the resulting Pt nanoparticle size, location, and aggregation.

Main Methods:

Small-angle X-ray scattering (SAXS) to analyze matrix lamellar structure and periodicity.

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Electron density profiling to determine structural reorganization upon metalation.

Transmission electron microscopy (TEM) for visualizing Pt nanoparticle size and distribution.

Chemical reduction of platinum ions using sodium borohydride (NaBH4) or hydrogen (H2).

Main Results:

PODS matrices exhibit lamellar ordering with a periodicity of 5.24 nm.
Introduction of octadecene (ODC) or octadecylamine (ODA) distorts the hydrophobic tails of the PODS matrix.
Pt nanoparticles are localized along the siloxy bilayers in PODS/ODC matrices.
Metalation with H2PtCl6.6H2O in PODS/ODA matrices causes broadening of siloxy bilayers and distortion of hydrophobic layers.
NaBH4 reduction restores PODS organization, while H2 reduction partially preserves distortion, indicating proximity of Pt nanoparticles to siloxy bilayers.
TEM confirmed monodisperse Pt nanoparticles (~1 nm) along siloxy bilayers; SAXS indicated aggregation within PODS double layers.

Conclusions:

Functionalized PODS matrices effectively serve as reaction media for synthesizing Pt nanoparticles.
The matrix structure significantly influences the localization and aggregation of Pt nanoparticles.
The choice of reducing agent impacts the final matrix organization and nanoparticle arrangement.