We demonstrate the growth, assembly, and characterization of ultrahigh quality polaritonic systems based on α-MoO3 microplates and nanoribbons. These micro- and nanostructures are bottom-up-synthesized single crystals with minimal impurities. By optimizing the growth conditions, we also realize morphology control of the α-MoO3 structures. We observe highly confined polariton modes in the individual structures by using scattering-type scanning near-field optical microscopy. These highly confined polariton modes are of fundamental and technological interest.
We report a simple, versatile, and wafer-scale water-assisted transfer printing method (WTP) that enables the transfer of nanowire devices onto diverse nonconventional substrates that were not easily accessible before, such as paper, plastics, tapes, glass, polydimethylsiloxane (PDMS), aluminum foil, and ultrathin polymer substrates. The WTP method relies on the phenomenon of water penetrating into the interface between Ni and SiO2. The transfer yield is nearly 100%, and the transferred devices, including NW resistors, diodes, and field effect transistors, maintain their original geometries and electronic properties with high fidelity.
This paper describes a simple and yet rapid flame synthesis method to produce one dimensional metal oxide
nanostructures by directly oxidizing metals in the post-flame region of a flat flame. α-Fe2O3 nanoneedles grow in the
post-flame region by a solid diffusion mechanism, are highly crystalline, and are aligned perpendicularly to the substrate,
with a large surface coverage density. The growth rate of the nanostructures is almost two orders of magnitude larger
than those demonstrated previously in furnaces or on hotplates. The rapid growth rate is attributed to the large initial
heating rate of the metal substrate in the flame, which generates thin and porous oxide layers that greatly enhance the
diffusion of the deficient species to the nanostructure growth site.
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