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Lu J.,Shaanxi University of Science and Technology | Zhang Y.,Shaanxi University of Science and Technology | Li Z.,Xianyang Research and Design Institute of Ceramics | Huang J.,Shaanxi University of Science and Technology | And 3 more authors.
Ceramics International | Year: 2015

The fast-response humidity sensor based on CoTiO3 thin film was prepared by RF magnetron co-sputtering using TiO2 and Co2O3 targets followed by post-annealing process. The effects of annealing temperature and target sputtering power ratio on the preparation and humidity sensing properties of CoTiO3 films were thoroughly investigated. The results show that an annealing treatment is beneficial for the crystallization and (100) preferred orientation of CoTiO3 film. The sputtering power ratio of Co2O3 to TiO2 affects the phase composition and morphology of the films. The most sensitive CoTiO3 film with fastest response/recovery is prepared by employing co-sputtering power of 100W and 400W for Co2O3 and TiO2, respectively, as well as the post-annealing at 650°C for two hours. The sensitivity value of the as-prepared CoTiO3 film is 17.02 towards 95% RH, and the response/recovery time is as short as 1s. This fast response is attributed to (100) preferred orientation and the fine-established-net morphology. © 2015 Elsevier Ltd and Techna Group S.r.l.


Fengping H.,Shaanxi University of Science and Technology | Shuai W.,Shaanxi University of Science and Technology | Shuang Z.,Shaanxi University of Science and Technology | Yingge F.,Shaanxi University of Science and Technology | And 3 more authors.
Bulletin of the Korean Chemical Society | Year: 2014

The praseodymium-doped TiO2 photocatalyst samples, which could degrade methyl orange under UV irradiation, were prepared by sol-microwave method for improving the photocatalytic activity of TiO2. The resulting materials were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Raman spectra, Fourier transform infrared spectra (FTIR) and Ultraviolet-visible diffuse reflectance spectra (UV-vis DRS). It was found Pr doping retarded the growth of crystalline size and the phase transformation from anatase to rutile, and narrowed the band gap energy. Praseodymium doping brought about remarkable improvement in the photoactivity. The optimal dopant amount of Pr was 2% by molar of cement and the calcination temperature was 500 °C for the best photocatalytic activity. The improvement of photocatalytic activity was ascribed to the occurrence of lattice distortion and the effective containment of the recombination of the electron-hole by Pr3+.


Lu J.,Shaanxi University of Science and Technology | Zhang Y.,Shaanxi University of Science and Technology | Li Z.,Xianyang Research and Design Institute of Ceramics | Huang J.,Shaanxi University of Science and Technology | And 3 more authors.
Ceramics International | Year: 2015

The fast-response humidity sensor based on CoTiO3 thin film was prepared by RF magnetron co-sputtering using TiO2 and Co2O3 targets followed by post-annealing process. The effects of annealing temperature and target sputtering power ratio on the preparation and humidity sensing properties of CoTiO3 films were thoroughly investigated. The results show that an annealing treatment is beneficial for the crystallization and (100) preferred orientation of CoTiO3 film. The sputtering power ratio of Co2O3 to TiO2 affects the phase composition and morphology of the films. The most sensitive CoTiO3 film with fastest response/recovery is prepared by employing co-sputtering power of 100 W and 400 W for Co2O3 and TiO2, respectively, as well as the post-annealing at 650 °C for two hours. The sensitivity value of the as-prepared CoTiO3 film is 17.02 towards 95% RH, and the response/recovery time is as short as 1 s. This fast response is attributed to (100) preferred orientation and the fine-established-net morphology. © 2015 Elsevier Ltd and Techna Group S.r.l. Allrightsreserved.


Wenbin L.,Shaanxi University of Science and Technology | Jianfeng H.,Shaanxi University of Science and Technology | Jie F.,Shaanxi University of Science and Technology | Zhenhai L.,Xianyang Research and Design Institute of Ceramics | And 2 more authors.
Materials and Design | Year: 2016

In order to overcome the poor interfacial bond between carbon fabric and phenolic matrix, carbon fiber powders (CFPs) were obtained by dry ball-milling technique and then the carbon fabric/phenolic composites filled with 0 wt% (C0), 1 wt% (C1) and 2 wt% (C2). CFPs were fabricated by successive filtration method and hot-press technique. Their mechanical and wet tribological properties were investigated based on the characteristics of surface morphology, three-dimensional surface profiles, skeletal density, pore structure and compressibility. Results show that the incorporation of CFPs obviously improves the interfacial bond and further increases the mechanical properties. Meanwhile, the introduction of CFPs increases the friction coefficient and improves the wear resistance. Notably, C1 exhibits the biggest friction coefficient, the smallest wear rate and the biggest flexural, shear and tensile strengths. Besides, SEM observation of worn surfaces suggests that the matrix crack and fiber breakage induced by fiber bending are the main wear mechanisms for C0 and fiber breakage induced by wear debris is the chief wear mechanism for C1 and C2. © 2016 Elsevier Ltd.


Liu S.,Shaanxi University of Science and Technology | Huang J.,Shaanxi University of Science and Technology | Cao L.,Shaanxi University of Science and Technology | Li J.,Shaanxi University of Science and Technology | And 3 more authors.
Materials Science in Semiconductor Processing | Year: 2014

TiO2-WO3 composite crystallites were prepared by a one-pot synthesis via hydrothermal reaction using Ti(SO4)2 and Na2WO4·2H2O as source materials. The samples were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectrometer (EDS) methods. Results reveal that the WO3 particles are uniformly dispersed on the surface of TiO2 particles without any detectable change in crystal structure and morphology of the TiO 2-WO3 composite nanocrystallites. Corresponding photocatalytic properties of the pure TiO2 and TiO 2-WO3 crystallites are found to increase first and then decrease with increasing W/Ti molar ratios. The sample with a W/Ti molar ratio of 1:99 shows the highest photodegradation rate (95.8%) for Rhodamine B under natural sunlight irradiation. © 2013 Elsevier Ltd.

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