Nankai University

About: Nankai University is a education organization based out in Tianjin, China. It is known for research contribution in the topics: Catalysis & Enantioselective synthesis. The organization has 42964 authors who have published 51866 publications receiving 1127896 citations. The organization is also known as: Nánkāi Dàxué.

Analysis of etched long-period fibre grating and its response to external refractive index

Abstract: Analytical formulas are presented for the first time to describe the shift in the resonance wavelength of a long-period fibre grating (LPFG) in response to etching of the fibre cladding or a change in the external refractive index. The accuracy of the formulas is confirmed by comparison with numerical simulations and experimental results. It is shown that the resonance wavelengths of an etched LPFG are more sensitive to the external refractive index than those of an unetched grating.

Preparation and lithium storage performances of mesoporous Fe₃O₄@C microcapsules.

Abstract: Fe3O4@C microcapsules were prepared using carbon-coated α-FeOOH nanorods as precursors, which were synthesized via two-step hydrothermal reactions. During the subsequent sintering procedure, α-FeOOH was reduced to Fe3O4 by carbon, accompanied by the formation of mesopores. In Fe3O4@C microcapsules, mesoporous Fe3O4 nanorods are coated with amorphorous carbon layers. The Fe3O4/C composites with such special structures demonstrate high specific capacity and good cyclic stability as anode materials in Li test cells.

Coding Acoustic Metasurfaces

Abstract: Coding acoustic metasurfaces can combine simple logical bits to acquire sophisticated functions in wave control. The acoustic logical bits can achieve a phase difference of exactly π and a perfect match of the amplitudes for the transmitted waves. By programming the coding sequences, acoustic metasurfaces with various functions, including creating peculiar antenna patterns and waves focusing, have been demonstrated.

Au nanoparticle-decorated porous SnO2 hollow spheres: a new model for a chemical sensor

Abstract: Au nanoparticle-decorated porous SnO2 hollow spheres, which are different from the conventional noble metal-doped thick or thin semiconductor films, are prepared and systematically investigated as a new model for chemical gas sensors. The synthesized Au-decorated porous SnO2 hollow spheres are characterized by means of X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy and inductively coupled plasma-optical emission spectroscopy. The Au content in the SnO2 support was determined as 5.63 wt% by XPS and 5.90 wt% by ICP, respectively, indicating the homogeneous dispersion of Au nanoparticles on SnO2 hollow spheres. Experimental results show that, by using ethanol as a probe molecule, this new model exhibits excellent sensing performances in terms of high response, fast response-recovery, superior selectivity and good stability. The enhanced sensing features are attributed to the improved gas diffusion and mass transport induced by the unique porous structure, the formation of conjugated electron depletion layers on both the outer and inner surfaces of the SnO2 hollow spheres and the catalytic effect of the Au nanoparticles. It is believed that the strategy of combining the porous nanostructure and catalytic activity of noble metals can further provide potential for other applications.