Conductive AFM study of the electronic properties of vertical GaN nanowires

V.A.S. thanks for support of the heterostructures characterization and K.Yu.S. thanks for support of the experimental data analysis the Ministry of Science and Higher Education of the Russian Federation (Grants 16.2593.2017/4.6 and 3.9796.2017/8.9, correspondingly), V.V.F. and A.M.M. thanks for support of the growth processes the Russian Federation President Council for grants (MK-1204.2019.2 and SP-2324.2018.1, correspondingly)

Study of inelastic electron tunneling in the Pt-Au tunnel junction in ultra-high vacuum STM

This work was carried out with the support of the Russian Science Foundation (Grant 17-19-01532)

Fabrication of Omniphobic‐Omniphilic Micropatterns using GPOSS‐PDMS Coating

Surfaces with special wettability properties, such as omniphobicity or omniphilicity, are essential for functional devices that use both aqueous and organic media. Micropatterning of omniphobic and omniphilic properties can provide a wide range of applications, including miniaturized experiments using both aqueous and organic media. Herein, an approach for creating omniphobic-omniphilic micropatterns based on selective photoacid polymerization of octa(3-glycidyloxypropyl) polyhedral oligomeric silsesquioxane modified with mono-aminopropyl-terminated polydimethylsiloxane is reported. The composition of the polymeric coatings using infrared spectroscopy; patterning accuracy using atomic force microscopy and scanning electron microscopy; wettability characteristics of the omniphobic, and omniphilic surfaces using contact angle measurements are studied. The proposed approach allows for single-step micropatterning (sub-10 µm) or macropatterning (3 mm). Liquids with surface tensions >22.8 mN m−1 can be confined to the omniphilic areas by the omniphobic borders. C2C12 cells are successfully cultivated in omniphilic areas, demonstrating their cell compatibility. The cells adhere to and grow on the entire surface of the pattern, without any signs of cytotoxicity. However, the strongest adhesion is observed in the omniphilic areas, making it possible to create cell micropatterns in a single step. The proposed method for the fabrication of omniphobic-omniphilic transparent, mechanically robust, biocompatible patterns can find applications in microfluidics, biotechnology or miniaturized biological screening experiments

Electronic properties of thin GaP layers grown on silicon wafers

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