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Size-Controlled and Sintering-Resistant Sub-3 nm Pt Nanoparticles on Graphene by Temperature-Variation Atomic Layer
Hao Van Bui1, Sri Sharath Kulkarni2, J Ruud van Ommen2
1Faculty of Materials Science and Engineering, Phenikaa University, Yen Nghia, Ha-Dong District, Hanoi 12116, Vietnam.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 9, 2025
Summary
This study presents a new atmospheric-pressure atomic layer deposition method for creating precisely sized, stable platinum nanoparticles on graphene. This technique enhances catalytic activity and stability for important chemical reactions.
Area of Science:
- Materials Science
- Nanotechnology
- Catalysis
Background:
- Noble metal nanoparticles, especially platinum (Pt), are crucial for heterogeneous catalysis.
- Controlling nanoparticle size and preventing sintering on supports like graphene is challenging.
- Conventional atomic layer deposition (ALD) methods often yield broad particle size distributions (PSDs).
Purpose of the Study:
- To develop a novel method for synthesizing size-controlled and sintering-resistant platinum nanoparticles (NPs) on graphene.
- To address limitations of conventional ALD in achieving narrow PSDs and high stability.
- To demonstrate the enhanced catalytic performance of these engineered NPs.
Main Methods:
- Utilized atmospheric-pressure ALD with cyclic temperature variation for Pt NP deposition on graphene.
- Employed MeCpPtMe3 as the Pt precursor and O2 as the reactant.
- Implemented alternating exposure steps: MeCpPtMe3 at 150 or 200 °C and O2 at room temperature.
Main Results:
- Achieved significantly narrower PSDs for Pt NPs compared to conventional ALD methods.
- Room-temperature O2 exposure effectively inhibited NP diffusion and coalescence.
- Synthesized Pt NPs exhibited enhanced catalytic activity and stability in propene oxidation, despite lower Pt loading.
Conclusions:
- The developed cyclic temperature-variation ALD approach enables size-controlled synthesis of stable Pt NPs on graphene.
- This method offers a pathway for producing highly dispersed and sintering-resistant noble metal NPs.
- The findings suggest potential for improved catalytic applications using engineered nanomaterials.
