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

被引：0
|
作者：
Liu, Panmei [1 ]
Ma, Shuo [1 ]
Mou, Zetao [1 ]
Liu, Yongchang [1 ]
Wang, Zumin [1 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China
来源：
SCRIPTA MATERIALIA | 2025年 / 256卷
基金：
中国国家自然科学基金;
关键词：
Metal nanoparticles; Grain growth; Thermal stability; Thermodynamics; Activation energy; THERMODYNAMIC STABILITY; SURFACE; INTERFACES; SYSTEM; MODEL; AU; AG;
D O I：
10.1016/j.scriptamat.2024.116436
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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 PtAl2O3 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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页数：7
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