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In this paper, homogenous gold nanoparticles (AuNPs) with a high density and a narrow size distribution were successfully fabricated on titanate nanowires (TNWs) sca®olds in the absence of organic capping agents. An ameliorated low-temperature hydrothermal method was used to prepare the TNWs sca®olds like bird's nest on the Ti substrate, and the nanowires diameter was about 30-80nm. Then, AuNPs were synthesized on the TNWs sca®olds with a depositionprecipitation urea (DPU) method. The TEM and XRD measurements indicated that well-crystallized face-centered cubic (fcc) AuNPs were homogeneously dispersed on TNWs, and AuNPs with average sizes of 2.7 nm and 4 nm were obtained, respectively for the theoretical gold loading 5 wt.% and 8 wt.%. Inspiringly, the 8%-AuNPs/TNWs catalyst could reduce 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) within 210 s, and exhibited better catalytic reduction performance than that of 5%-AuNPs/TNWs.

Three different low-temperature plasma-based methods for hydrophilicity improvement of polyethylene films at atmospheric pressure * Chen Guang-Liang(陈光良) a) † , Zheng Xu(郑 旭) a) , Huang Jun(黄 俊) a) , Si Xiao-Lei(司晓蕾) a) , Chen Zhi-Li(陈致力) a) , Xue Fei(薛 飞) a) , and Sylvain Massey b) a)

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In this paper, a highly catalytic and nanosized Ag/Co 3 O 4 composite for rhodamine B (RhB) degradation was fabricated by using the co-precipitation method at room temperature. The Ag/ Co 3 O 4 structure and catalytic properties were characterized through scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) gassorption measurements, X-ray di®raction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-Vis spectroscopy. The results showed that the Co 3 O 4 nanosheets prepared by hydrothermal synthesis mainly exposed (2 2 0) and (1 1 1) facets, which played an important role in determining its catalytic oxidation performance. The Co 3 O 4 nanosheets doped with Ag nanoparticles by a simple silver-mirror reaction exhibited a stable and well-dispersed property in dye solution. Compared to the Ag and Co 3 O 4 nanostructure, the Ag nanoparticles with bigger diameter (10 nm) on Co 3 O 4 surface also readily produced surface-active oxygen species and exhibited a higher catalytic activity for the degradation of RhB solution (5 mg Á L À1 ) under the visible light. The kinetic constant K of Ag/Co 3 O 4 catalyst for RhB degradation reaction was evaluated to 0.02724 min À1 , which is relatively higher than those reported in the literatures.