Vidal Cynthia, Wang Dong, Schaaf Peter, Hrelescu Calin, Klar Thomas A
Institute of Applied Physics, Johannes Kepler University Linz , 4040 Linz, Austria.
Institute of Materials Engineering and Institute of Micro- and Nanotechnologies MacroNano, Technische Universität Ilmenau , 98693 Ilmenau, Germany.
ACS Photonics. 2015 Oct 21;2(10):1436-1442. doi: 10.1021/acsphotonics.5b00281. Epub 2015 Sep 8.
The search for novel plasmonic nanostructures, which can act simultaneously as optical detectors and stimulators, is crucial for many applications in the fields of biosensing, electro- and photocatalysis, electrochemistry, and biofuel generation. In most of these areas, a large surface-to-volume ratio, as well as high density of active surface sites, is desirable. We investigate sponge-like, that is, fully porous, nanoparticles, called nanosponges, where both the gold and the air phase are fully percolated in three dimensions. We correlate, on a single nanoparticle basis, their optical scattering spectra (using dark field microscopy) with their individual morphology (using electron microscopy). We find that the scattering spectra of nanosponges depend only weakly on their size and outer shape, but are greatly influenced by their unique percolation, in qualitative agreement with numerical simulations.
寻找能够同时作为光学探测器和刺激器的新型等离子体纳米结构，对于生物传感、电催化和光催化、电化学以及生物燃料生成等领域的许多应用至关重要。在这些领域中的大多数，都需要大的表面积与体积比以及高密度的活性表面位点。我们研究了海绵状的，即完全多孔的纳米颗粒，称为纳米海绵，其中金和空气相在三维空间中完全渗透。我们在单个纳米颗粒的基础上，将它们的光学散射光谱（使用暗场显微镜）与其个体形态（使用电子显微镜）相关联。我们发现纳米海绵的散射光谱仅微弱地依赖于它们的尺寸和外形，但受到其独特渗透的极大影响，这与数值模拟在定性上是一致的。
