With the help of density functional theory (DFT) approach the electronic properties of Al and Si doped (2, 2) graphyne nanotube (GNT) has been investigated. We have chosen two doping positions. In one situation we have replaced one carbon atom by Al/Si atom in the chain position of the GNT and in other case we have substituted the carbon atom in the hexagonal ring by Al/Si atom. The result of t...

Al-doped ZnO has attracted much attention as a transparent electrode. The graphene-like ZnO monolayer as a two-dimensional nanostructure material shows exceptional properties compared to bulk ZnO. Here, through first-principle calculations, we found that the transparency in the visible light region of Al-doped ZnO monolayer is significantly enhanced compared to the bulk counterpart. In particul...

Many potential applications of graphene require its precise and controllable doping with charge carriers. Being a two-dimensional material graphene is extremely sensitive to surface adsorbates, so its electronic properties can be effectively modified by deposition of different atoms and molecules. In this paper, we review two mechanisms of graphene doping by surface adsorbates, namely electroni...

Two types of single crystal Bi2Se3 samples are prepared which allow us to span the surface doping range investigated in the main text. For the high doping level samples where ED = 0.28 eV below EF , stoichiometric mixture of Bi and Se are used. And for the low doping level samples where ED = 0.06 eV, the initial mixture of Bi:Se = 2:4.06 are used. ED in between these two levels are tuned throug...

OBJECTIVE To explore use and attitudes toward drugs and dietary supplements (DS) and knowledge concerning doping in cycling. DESIGN Retrospective cross-sectional study. SETTING Professional cycling. PARTICIPANTS Elite under-23 male cyclists. INTERVENTION Anonymous semistructured questionnaire administered during race periods. MAIN OUTCOME MEASURES Use and attitudes toward DS and drugs...

YBCO bulk single-grain samples with the nominal composition Y1.5Ba2(Cu1-xAlx)3Oy were fabricated by the Top – Seeded Melt – Growth process. Aluminium was found to be a suitable chemical dopant in Y1Ba2(Cu1-xAlx)3O7/Y2BaCuO5 bulk superconductors, which introduces effective nanosized pinning centres. An increase of the critical current density, Jc, and the appearance of a peak effect were observe...

In LaTiO₃/SrTiO₃ and LaAlO₃/SrTiO₃ heterostructures, the bending of the SrTiO₃ conduction band at the interface forms a quantum well that contains a superconducting two-dimensional electron gas (2-DEG). Its carrier density and electronic properties, such as superconductivity and Rashba spin-orbit coupling can be controlled by electrostatic gating. In this article we show that the Fermi energy l...

A pure ZnO sample and a sample containing 3 mol% Al were prepared by (co)-precipitation as model materials for the oxidic support phase in Cu/ZnO/Al(2)O(3) methanol synthesis catalysts. The samples were characterized with respect to their crystal, defect and micro-structure using various methods (XRD, TEM, XPS, UV-vis spectroscopy, EPR, NMR). It was found that a significant fraction of the Al i...