ИСТИНА

Metal nanoparticles, possessing Localized Surface Plasmon Resonance (LSPR), are one of the most promising building blocks for nanooptics. Large-scale self-assembly of metallic nanoparticles (NPs) with tunable optical response on various substrates (Z.A. Khan et al., J.Mater.Sci., 2011) and interfaces (E.F. Borra et al., Nature, 2007) is the most attractive strategy for production of ultrathin filters and mirrors. Recently we have developed a novel, scalable and simple method to obtain highly stable continuous gold nanofilms at various liquid-liquid interfaces (E.Smirnov et al., ACSNano, 2014). The method allows creating both sub- and multilayer self-healing assemblies of AuNPs at liquid-liquid interfaces. In this work we investigate optical responses – both extinction and reflection – of nanofilms in situ with stepwise increasing of AuNPs concentration. Obtained results are intriguing and indicate non-linear behavior of assemblies with accumulating AuNPs. This effect is most likely caused by morphological changes: 2D closed-packed films transfers into 3D thick layer.