نتایج جستجو برای: insulating layer
تعداد نتایج: 289916 فیلتر نتایج به سال:
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The high dispersion found in the literature for the conductivity of Reduced Graphene Oxide (RGO) layers makes it highly desirable to develop fast and non-invasive methods for their characterization. Here we show that Electrostatic Force Microscopy (EFM) is an in situ, fast, and contactless technique to evaluate the conductivity of chemically derived graphene layers. The dielectric response of R...
Considerable progress has been made recently, using scanning tunnelling microscopy (STM), scanning tunnelling spectroscopy (STS) and local density functional theory (DFT), in examining the atomic structure and electronic properties of ultrathin insulating films. This article reviews pertinent results to date with special emphasis on ultrathin MgO films on Ag(001) surfaces. Using STS, the layer-...
In this work, we report on the synthesis and the electrical properties of ZnO nanoparticles, which differ in their organic shell. The introduction of a 2-ethylhexanoate shell instead of a common acetate shell has an impact on the accessible size of the ZnO nanoparticles and changes the electrical properties of thin films in transistors. While acetate covered ZnO particles behave as a semiconduc...
We report experimental signatures of plasmonic effects due to electron tunneling between adjacent graphene layers. At subnanometer separation, such layers can form either a strongly coupled bilayer graphene with a Bernal stacking or a weakly coupled double-layer graphene with a random stacking order. Effects due to interlayer tunneling dominate in the former case but are negligible in the latte...
A theory is developed for calculating vertical tunneling current between two sheets of bilayer graphene separated by a thin, insulating layer of hexagonal boron nitride, neglecting many-body effects. Results are presented using physical parameters that enable comparison of the theory with recently reported experimental results. Observed resonant tunneling and negative differential resistance in...
A new formalism to calculate the transmission coefficient t of electrons from a material L into the same material L through a barrier B is presented. The barrier B is arbitrary and can be metallic, semiconducting or insulating. The important feature of this formalism is that it starts from the electronic structure of a periodic L/B superlattice. The electronic stucture of such a superlattice is...
OBJECTIVES This study was designed to investigate the effect on skin temperature of different methods of use of a hydrogel dressing. METHODS Twelve volunteers had temperature measured under a hydrogel dressing with different combinations of air movement and bandaging. RESULTS A large drop in skin temperature was only achieved when the dressing was left exposed with air movement over the sur...
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