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Published on: February 26, 2019
Controlled Synthesis of Pd/Pt Core Shell Nanoparticles Using Area-selective Atomic Layer Deposition.
Kun Cao1, Qianqian Zhu1, Bin Shan2
11] State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering [2] State Key Laboratory of Material Processing and Die and Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei, PR China 430074.
We developed a method for precisely controlling the synthesis of palladium/platinum (Pd/Pt) core-shell nanoparticles using area-selective atomic layer deposition (ALD). This technique enables tunable nanoparticle size, shell thickness, and composition for advanced material applications.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Atomic layer deposition (ALD) offers precise control over thin film growth.
- Fabricating core-shell nanoparticles with controlled composition and structure remains challenging.
- Surface modification is crucial for achieving selective area deposition.
Purpose of the Study:
- To develop an atomic-scale controllable synthesis of Pd/Pt core-shell nanoparticles.
- To demonstrate the use of self-assembled monolayers (SAMs) for area-selective ALD.
- To achieve uniform core-shell structures with narrow size distribution.
Main Methods:
- Utilized octadecyltrichlorosilane (ODTS) SAMs to modify a surface, creating pinholes as nucleation sites.
- Employed area-selective atomic layer deposition (ALD) for sequential core and shell nanoparticle growth.
- Controlled NP size, shell thickness, and composition by adjusting ALD cycles.
Main Results:
- Successfully synthesized Pd/Pt and Pt/Pd core-shell nanoparticles with uniform structures.
- Demonstrated precise control over nanoparticle size and shell thickness.
- Showcased the blocking effect of ODTS SAMs to prevent new nucleation sites during shell deposition.
Conclusions:
- Developed a SAMs-assisted area-selective ALD method for fabricating core-shell nanoparticles.
- This method significantly expands the applicability of ALD for novel nanostructure fabrication.
- The technique is adaptable for growing core-shell nanoparticles with various compositions.
