Nanoporous gold (NPG) has numerous applications in (electro)catalysis, (bio)sensing, actuation, and photonics. The economic viability, however, remains a barrier to its widespread applicability. In this study, lean noble alloys (5 at. % Au) were designed and fabricated while aiming for the minimum gold content to ensure a fully Au covered surface after electrochemical dealloying. Moreover, the morphological effects of alloying with Pt were elucidated via electrochemical, microscopical, and tomographical characterization. The true surface area after dealloying was found to increase by a factor of 240 and 900 in the case of the binary (Ag₉₅Au₅) and the ternary (Ag₉₄Au₅Pt₁) systems, respectively. To enable atom probe tomography (APT) on such highly porous samples, the nanoporous structures were filled by Cu electrochemical depositon. APT data analysis provided various composition profiles according to which Au enrichment on ligament edges, which was more pronounced in the case of the binary samples, was detected. Future experiments on monolayer Au covered model samples are planned to obtain conclusive atomic-scale insight into the near surface composition of lean nanoporous gold structures.

纳米多孔金（NPG）在（电）催化，（生物）传感，驱动和光子学中有许多应用。然而，经济可行性仍然是其广泛应用的障碍。在这项研究中，设计和制造了稀有贵金属（5 at。％Au），同时力求最小化金含量，以确保电化学脱合金后完全覆盖Au的表面。此外，通过电化学，微观和断层表征来阐明与Pt合金化的形态学影响。发现在二元（Ag ₉₅ Au ₅）和三元（Ag ₉₄ Au ₅ Pt ₁）情况下，脱合金后的真实表面积分别增加了240和900倍。）系统。为了能够在这种高度多孔的样品上进行原子探针层析成像（APT），通过Cu电化学沉积填充纳米孔结构。APT数据分析提供了各种组成特征，根据这些特征，可以检测到韧带边缘的金富集，这在二元样品的情况下更为明显。计划在Au覆盖的单层模型样品上进行进一步的实验，以获得对贫化的纳米多孔金结构的近表面组成的结论性原子尺度见解。