Baker Andrew, Vishnubhotla Sai Bharadwaj, Karpe Sanjana, Yang Yahui, Veser Götz, Jacobs Tevis D B
Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States of America.
Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States of America.
Nano Lett. 2025 Apr 30;25(17):6903-6909. doi: 10.1021/acs.nanolett.5c00076. Epub 2025 Apr 15.
The adhesion of nanoparticles to their supports is key to their performance and stability. However, scientific advances in this area have been hampered by the difficulty of experimentally probing adhesion. To date, only a single technique has been developed that can measure nanoparticle adhesion, and this technique is inherently limited to monometallic systems. We present a versatile technique for the direct measurement of adhesion for bimetallic nanoparticle systems. This technique combines the spatial resolution of transmission electron microscopy with the force resolution of an atomic force microscope to probe individual, well-characterized nanoparticles. A first study of supported bimetallic nanoparticles provides new insights into the complex impact of alloying on nanoparticle adhesion, explained by charge transfer between constituent metals. The new experimental technique is readily extensible to study other multimetallic nanoparticle systems, including the effects of particle size, shape, and orientation, thus enabling advances in our understanding of nanoparticle physics.
纳米颗粒与载体的粘附力是其性能和稳定性的关键。然而，该领域的科学进展因实验探测粘附力的困难而受阻。迄今为止，仅开发出一种能够测量纳米颗粒粘附力的技术，并且该技术本质上仅限于单金属体系。我们提出了一种用于直接测量双金属纳米颗粒体系粘附力的通用技术。该技术将透射电子显微镜的空间分辨率与原子力显微镜的力分辨率相结合，以探测单个特征明确的纳米颗粒。对负载型双金属纳米颗粒的首次研究为合金化对纳米颗粒粘附力的复杂影响提供了新见解，这可以通过组成金属之间的电荷转移来解释。这种新的实验技术很容易扩展到研究其他多金属纳米颗粒体系，包括颗粒尺寸、形状和取向的影响，从而推动我们对纳米颗粒物理学的理解取得进展。
