氧化物中铂纳米粒子的生长机制研究：金属-氧化物相互作用的作用

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2024-11-01 DOI:10.1016/j.scriptamat.2024.116436

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引用次数: 0

摘要

金属纳米粒子（NPs）与氧化物基质之间的强烈相互作用可显著提高金属 NPs 的热稳定性。然而，金属与氧化物之间的相互作用如何控制金属 NPs 的生长仍不清楚。在此，通过将铂 NPs 封装在不同的 Al2O3 和 SiO2 氧化物中，研究了金属-氧化物相互作用对铂 NPs 生长的影响。封装在 Al2O3 中的铂 NPs 比封装在 SiO2 中的铂 NPs 表现出优异的热稳定性。定量热力学计算显示，金属与氧化物之间的相互作用在很大程度上决定了铂在 Al2O3 和 SiO2 中凝聚的驱动力。动力学分析进一步表明，较强的 Pt-Al2O3 相互作用通过限制 Pt 原子在氧化物中的扩散，控制了 Pt NPs 的奥斯特瓦尔德熟化，导致 Pt 在 Al2O3 中的生长活化能高于 SiO2。这些发现解释了金属 NPs 在不同氧化物中的不同烧结阻力，为提高金属 NPs 的热稳定性提供了宝贵的见解。

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Study on the growth mechanism of Pt nanoparticles in oxides: Role of metal-oxide interactions

Strong interactions of metal nanoparticles (NPs) with oxide matrices can dramatically enhance the thermal stability of metal NPs. However, how metal-oxide interactions control the growth of metal NPs remains unclear. Here, the growth of Pt NPs with respect to metal-oxide interactions was investigated by encapsulating them in different Al₂O₃ and SiO₂ oxides. Pt NPs encapsulated in Al₂O₃ exhibited excellent thermal stability than those in SiO₂. Quantitative thermodynamic calculations revealed that metal-oxide interactions strongly governed the driving force for the coalescence of Pt in Al₂O₃ and SiO₂. The kinetic analysis further showed that stronger Pt-Al₂O₃ interactions controlled the Ostwald ripening of Pt NPs by restricting the diffusion of Pt atoms in oxides, leading to a higher growth activation energy of Pt in Al₂O₃ than SiO₂. These findings explain the different sinter resistance of metal NPs when encapsulated in different oxides, providing valuable insights for enhancing the thermal stability of metal NPs.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.