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Size- and composition-controlled Pt–Sn bimetallic nanoparticles prepared by atomic layer deposition

机译:通过原子层沉积制备的尺寸和成分受控的Pt-Sn双金属纳米粒子

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Pt–Sn bimetallic nanoparticles (BMNPs) are used in a variety of catalytic reactions and are widely accepted as a model system for Pt-based bimetallics in fundamental catalysis research. Here, Pt–Sn BMNPs were prepared via a two-step synthesis procedure combining atomic layer deposition (ALD) and temperature programmed reduction (TPR). In situ X-ray diffraction measurements during TPR and ex situ X-ray absorption spectroscopy at the Pt LIII-edge revealed the formation of Pt–Sn bimetallic alloys with a phase determined by the Pt/(Pt + Sn) atomic ratio of the as-deposited bilayer. The size of the BMNPs could be tuned by changing the total thickness of the bilayers, while keeping the Pt/(Pt + Sn) atomic ratio constant. Due to the exceptional control over BMNP size and crystalline phase, the proposed method will enable highly systematic studies of the relation between the structure and the performance of Pt–Sn bimetallic catalysts.
机译:Pt-Sn双金属纳米颗粒(BMNP)用于多种催化反应,在基础催化研究中被广泛用作Pt基双金属的模型系统。在此,通过结合原子层沉积(ALD)和程序升温还原(TPR)的两步合成程序, 制备了Pt-Sn BMNP。在Pt L III 边缘进行TPR期间的原位 X射线衍射测量和异位X射线吸收光谱揭示了Pt的形成–Sn双金属合金,其相由沉积的双层的Pt /(Pt + Sn)原子比决定。可以通过改变双层的总厚度来调整BMNP的大小,同时保持Pt /(Pt + Sn)原子比恒定。由于对BMNP尺寸和结晶相的特殊控制,所提出的方法将能够对Pt-Sn双金属催化剂的结构与性能之间的关系进行高度系统的研究。

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