Articles you may be interested inPreparation of α -Al 2 O 3 thin films by electron cyclotron resonance plasma-assisted pulsed laser deposition and heat annealing
Polystyrene (PS) core–TiO2 shell composite particles and TiO2 hollow spheres were fabricated using the liquid phase deposition (LPD) method. Composite particles were prepared using PS particles as templates. Calcination of the composite particles resulted in TiO2 hollow spheres. Uniform TiO2 hollow spheres were obtained when the reaction time of the LPD process was between 4 and 8 h. Furthermore, we fabricated TiO2 hollow spheres whose inner surfaces were functionalized by Pt particles after platinized PS particles were used as templates. The Pt particles were immobilized on the inner surfaces of the hollow spheres.
Carbon nitride films were prepared on a Si(100) substrate by an electron cyclotron resonance plasma sputtering method using a carbon target and a nitrogen atmosphere. The maximum value of the N/C ratio in the film deposited at a substrate bias potential of about −55 V and ambient temperature was 1.35, which is close to the stoichiometric composition of C3N4. The surface morphology observed with scanning electron microscopy of the film deposited at 600 °C showed a crystalline structure with a 500 nm average grain diameter. The x-ray diffraction pattern of the film deposited at 600 °C and a substrate bias potential of −50 V indicates no amorphous phase in the film, which is composed of β- and α-C3N4 phases containing an unidentified C–N phase.
The chemisorption of sulphur at the (110) face of nickel induces drastic changes in the multilayer relaxation: the oscillatory relaxation of the first and second interlayer distances at the clean surface (-8.4 2 0.8% and +3 2 1%, respectively) changes in sign and increases slightly ( + l o 2 2% and -3.5 2 1.5%) upon sulphur chemisorption.The sulphur atoms are in the hollow adsorption site at 0.84 2 0.03 A above the top nickel layer. This position is in good agreement with previous results obtained from angularresolved Auger emission of sulphur or from Rutherford backscattering (RBS) with mediumenergy ions. We also agree with the sign reversal of the relaxation of the top layer reported from RBS experiments, but we find that it is larger (+ 10% instead of +6%) and discover, in addition, a substantial contraction of the second interlayer spacing.
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