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Qi G.,Tianjin University of Technology | Zhang L.,Tianjin University of Technology | Yuan Z.,Tianjin University of Technology | Yuan Z.,Tianjin Key Laboratory for Photoelectric Materials and Devices
Physical Chemistry Chemical Physics | Year: 2014

To avoid a spontaneous reaction between ZnO gas sensing materials and detected H2S gas, ZnO nanorods decorated with a several nm ZnS thin layer were designed. The ZnS-decorated layer was prepared by passivating oriented ZnO nanorods in a H2S atmosphere. The effect of the passivation processes on the H2S sensing properties was investigated. It was found that ZnO nanorods decorated with a 2 nm-thick ZnS layer possessed a repeatable and superior response to ppm-level H2S at room temperature. Moreover, a confinement effect was proposed to explain the improved sensing properties of the decorated ZnO nanorods. © 2014 The Owner Societies.

Liu A.-H.,Tianjin University of Technology | Yang L.-Y.,Tianjin University of Technology | Yang L.-Y.,Tianjin Key Laboratory for Photoelectric Materials and Devices
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2012

A double layer NPB/Alq 3 heterojunction organic light emitting device using Ag/4-FTP(SAM)/m-MTDATA as combined hole-injecting layer was fabricated. The device performance was studied and compared with the control device. The effect of the Ag layer thickness on the device performance is also investigated. The variation of the spectral narrowing and intensity enhancement can be explained with microcavity effects. The results revealed that indium tin oxide (ITO) anode modified with Ag(5 nm)/ 4-FTP(SAM) demonstrated good transparency, enhanced hole injection ability and smooth interface morphology, which result in an improved device performance. The highest luminance of 34680 cd/m 2 at 12 V and a luminous efficiency of 6.9 cd/A were achieved for the device with the structure of ITO/Ag/4-FTP(SAM)/m-MTDATA/NPB/Alq 3/LiF/Al. However, the control device showed 25300 cd/m 2 at the same bias.

Wang X.W.,Tianjin University of Technology | Wang X.W.,Tianjin Key Laboratory for Photoelectric Materials and Devices | Yuan Z.H.,Tianjin University of Technology | Fang B.C.,Tianjin University of Technology
Materials Chemistry and Physics | Year: 2011

Ni nanotube arrays with different diameters were fabricated in the pores of the porous anodic alumina membranes by direct current electrodeposition. The crystal structure and micrograph of Ni nanotube arrays were characterized by X-ray diffraction, transmission electron microscopy, and field-emission scanning electron microscopy. The results indicate that Ni nanotubes have no preferred orientation and are polycrystalline structure. The magnetic behaviors of Ni nanotube arrays with different diameters are investigated, and the coercivity of Ni nanotubes depends strongly on their diameters. The size-dependent behavior of the coercivity is qualitatively explained in terms of localized magnetization reversal. © 2010 Elsevier B.V. All rights reserved.

Ye X.,Tianjin University of Technology | Chen M.,Tianjin University of Technology | Chen M.,Tianjin Key Laboratory for Photoelectric Materials and Devices | Yang M.,Tianjin University of Technology | And 2 more authors.
Journal of Materials Science: Materials in Medicine | Year: 2010

Due to good biocompatibility and mechanical properties, magnesium (Mg) and its alloys are considered promising degradable materials for orthopedic applications. In this work, a Mg metal matrix composite (MMC) was fabricated using Mg-2.9Zn-0.7Zr alloy as the matrix and 1 wt% nano-hydroxyapatite (n-HA) particles as reinforcements. In vitro corrosion behavior and cytocompatibility of a Mg-Zn-Zr/n-HA composite and a Mg-Zn-Zr alloy were investigated. In contrast with the Mg-Zn-Zr alloy, the MMC has better properties. The average corrosion rate of MMC is 0.75 mm/yr after immersion in simulated body fluid (SBF) for 20 days, and the surface of MMC is covered with white Ca-P precipitates. The electrochemical test results show that the corrosion potential (E corr) of MMC increases to -1.615 V and its polarization resistance (R p) is 2.56 KΩ with the addition of n-HA particles. The co-cultivation of MMC with osteoblasts results in the adhesion and proliferation of cells on the surface of the composite. The maximum cell density is calculated to be (1.85±0.15) × 104/l after 5 days of co-culture with osteoblasts. The average cell numbers for two groups after culturing for 3 and 5 days (P<0.05) are significantly different. All the results demonstrate that the Mg-Zn-Zr/n-HA composite can be potentially used as biodegradable bone fixation material. © 2009 Springer Science+Business Media, LLC.

Guo S.-Q.,Nankai University | Jing T.-Z.,Nankai University | Zhang X.,Nankai University | Yang X.-B.,Nankai University | And 2 more authors.
Nanoscale | Year: 2014

In this work, we report the synthesis of mesoporous Bi2S3 nanorods under hydrothermal conditions without additives, and investigated their catalytic activities as the CE in DSCs by I-V curves and tested conversion efficiency. To further improve their power conversion efficiency, we added different amounts of reduced graphene by simple physical mixing. With the addition of 9 wt% reduced graphene (rGO), the short-circuit current density, open-circuit voltage and fill factor were Jsc = 15.33 mA cm-2, Voc = 0.74 V and FF = 0.609. More importantly, the conversion efficiency reached 6.91%, which is slightly inferior to the commercial Pt counter electrode (7.44%). Compared to the conventional Pt counter electrodes of solar cells, this new material has the advantages of low-cost, facile synthesis and high efficiency with graphene assistance. To the best of our knowledge, this Bi2S3 + 9 wt% rGO system has the best performance ever recorded in all Bi2S3-based CEs in the DSCs system. © The Royal Society of Chemistry 2014.

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