Beilstein J. Nanotechnol.2017,8, 2357–2362, doi:10.3762/bjnano.8.235
visible spectrum through a fit of the acquired spectra to a model based on the Fresnel law.
Keywords: complex refractive index; franckeite; optical contrast; optical identification; vanderWaalsheterostructure; Introduction
Mechanical exfoliation is a very powerful technique to produce a large variety
is one of the few known examples of a naturally occurring vanderWaalsheterostructure (another example of these materials is the cylindrite [19], see Supporting Information File 1). Unlike most of the studied heterostructures (that are manually assembled layer-by-layer) franckeite, in its natural
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Figure 1:
Crystal structure of franckeite where the two different stacked layers, the SnS2-like and the PbS-l...