Search

Zinc oxide (ZnO) nano rods modified with gold (Au) nanoparticles were prepared by magnetron sputtering and hyd rot he rm al method, and characterized by field emission scanning electron microscope, transmission electron microscope, X-ray diffractometer and fluorescence spectrometer at different sputtering powers. The experimental results show that the ZnO nano rods at different sputtering powers are hexagonal wurtzite structure, grow along the crystal surface (002), and have high crystallinity. The UV excitation intensity of modified ZnO nano rods can be effectively enhanced by attaching Au nanoparticles to the surface. When the RF sputtering power is 80 W, ZnO nano rods show the best UV detection performance. Compared with unmodified ZnO nano rods, Au nanoparticles can inhibit the persistent photoconductivity (PPC) effect of ZnO nano rod s, and the response/recovery time of UV detection is reduced by 6.05 s and 4,54 s, respectively. The photodark current ratio is increased from 9.31 to 32.40, and the photo responsiveness is up to 1.94 A / W, which significantly enhances the UV detection capability of ZnO nano rods. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Functional Materials / Gongneng Cailiao is the property of Chongqing Functional Materials Periodical Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this paper, high purity Ta-Ru alloy was prepared by powder metallurgy hot press sintering. Tantalum ruthenium powder with high purity was mixed in different composition ratio on planetary ball mill, and hot pressed for 3 h at 1 700 ℃ and 20 MPa in vacuum hot pressing sintering furnace. The effect of different Ru contents on the phase composition, microstructure and mechanical properties of Ta-Ru alloys were investigated by XRD, SEM, EDS, tensile strength test and other analytical methods. The results show that, with increasing Ru content, several intermetallic compounds such as TaRu, Ta3Ru, and TaRu4 were successively formed in the alloy. The density and tensile strength of the alloy increased gradually, and the microhardness increased first and then decreased. The fracture mode changed from cleavage fracture to intergranular fracture and ductile fracture. [ABSTRACT FROM AUTHOR]