Mahr Christoph, Dworzak Alexandra, Schowalter Marco, Oezaslan Mehtap, Rosenauer Andreas
Institute of Solid State Physics, University of Bremen, Otto-Hahn-Allee 1, 28359Bremen, Germany.
MAPEX Center for Materials and Processes, University of Bremen, Bibliothekstr. 1, 28359Bremen, Germany.
Microsc Microanal. 2021 Aug;27(4):678-686. doi: 10.1017/S1431927621000519.
Quantitative structural characterization of nanomaterials is important to tailor their functional properties. Corrosion of AgAu-alloy nanoparticles (NPs) results in porous structures, making them interesting for applications especially in the fields of catalysis and surface-enhanced Raman spectroscopy. For the present report, structures of dealloyed NPs were reconstructed three-dimensionally using scanning transmission electron microscopy tomography. These reconstructions were evaluated quantitatively, revealing structural information such as pore size, porosity, specific surface area, and tortuosity. Results show significant differences compared to the structure of dealloyed bulk samples and can be used as input for simulations of diffusion or mass transport processes, for example, in catalytic applications.
纳米材料的定量结构表征对于定制其功能特性至关重要。银金合金纳米颗粒（NPs）的腐蚀会导致多孔结构，这使得它们在催化和表面增强拉曼光谱等领域的应用中备受关注。在本报告中，通过扫描透射电子显微镜断层扫描技术对脱合金化纳米颗粒的结构进行了三维重建。对这些重建结果进行了定量评估，揭示了诸如孔径、孔隙率、比表面积和曲折度等结构信息。结果表明，与脱合金化块状样品的结构相比存在显著差异，并且可作为扩散或质量传输过程模拟的输入，例如在催化应用中。
