| AVS 62nd International Symposium & Exhibition | |
| Thin Film | Tuesday Sessions |
| Session TF-TuA |
| Session: | ALD for Emerging Applications |
| Presenter: | Rong Chen, State Key Laboratory of Digital Manufacturing Equipment and Technology, China |
| Authors: | K. Cao, State Key Laboratory of Material Processing and Die & Mould Technology, China Q.Q. Zhu, State Key Laboratory of Material Processing and Die & Mould Technology, China B. Shan, State Key Laboratory of Material Processing and Die & Mould Technology, China R. Chen, State Key Laboratory of Digital Manufacturing Equipment and Technology, China |
| Correspondent: | Click to Email |
Bimetallic nanoparticles (NPs) have attracted great attention due to their unique properties for catalytic applications. Compared with the physical mixture of monometallic NPs or the alloyed bimetallic NPs, the formation of core shell NPs could further enhance the activity, selectivity and stability. The enhanced properties of core shell structure may originate from the lattice strain, bonding interaction and electron transfer due to the core shell interface. Synthesizing core shell nanoparticles (NPs) with well controlled shell thickness and composition is of great importance in optimizing their reactivity.
Here we report the successful synthesis of core shell NPs using an area-selective ALD technique. The selective ALD approach utilizes pinholes on the unsaturated ODTS SAMs layer to achieve selective core shell structure growth. The size, shell thickness, and composition of the NPs can be precisely controlled by varying the ALD cycles. The catalytic performance of Pd@Pt core shell NPs with different Pt shell thickness have been tested towards preferential oxidation of CO under excess H2 (PROX) reaction. The results show that the core shell structured NPs exhibit both great selectivity and enhanced activity. Core shell NPs with a completely covered monolayer of Pt shell shows optimized selectivity and activity. Density functional theory simulations have been carried out to explain such behavior of the core shell NPs system towards PROX reactions.