Pt heterostructures can have distinctly different physical and chemical properties to their single-phase components. Herein, a smart approach was developed for the large-scale production of graphitic C3N4-Pt (gC3N4-Pt) heterostructures on three-dimensional (3D) graphene sheet networks for highly efficient methanol oxidation. Because the gC3N4-Pt heterostructures on the conductive 3D graphene network support provide the methanol molecules good accessibility to the active sites, the obtained catalyst exhibits excellent electrocatalytic performance, including high catalytic activity, unusual CO tolerance, and good stability, and is superior to commercial Pt/C and Pt/graphene catalysts for methanol oxidation.

Four-state non-volatile memory functions are demonstrated in all-oxide multiferroic tunnel junctions (MFTJs), composed of La0.7Sr0.3MnO3 and La0.7Sr0.3Mn0.8Ru0.2O3 ferromagnetic electrodes and a SrTiO3/BaTiO3 dielectric/ferroelectric composite barrier. Compared with MFTJs with a single BaTiO3 barrier, the insertion of a SrTiO3 dielectric barrier is shown effective to enhance both the electroresistance and the magnetoresistance of the MFTJs. In particular, the tunneling electroresistance ratio is greatly improved by two orders. This is discussed in terms of the enhanced asymmetry in the electrostatic modulation on the barrier profile with respect to the ferroelectric polarization direction.

Doping Ln atom can manipulate the magnetic moment in phosphorene in the range from 1 μBto 7 μB, which could be a next-generation candidates of potential dilute magnetic semiconductor.

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