Huiqin An, Xiaojing Hu, Baolin Zhu, Juanjuan Song, Weiling Zhao, Shoumin Zhang and Weiping Huang
CS2-modified titanate nanotubes (CS2/TiO2-NTs) are fabricated by reaction of CS2 and Ti-O−Na+ species on titanate nanotubes. Pb2+ ions are coated on the modified nanotubes by ion exchange (Pb/CS2/TiO2-NTs). The products are characterized by means of nitrogen adsorption-desorption isotherms at 77 K (BET method), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), X-ray diffraction (XRD), atomic absorption spectrometry (AAS), and diffuse reflectance spectroscopy (DRS). The photocatalytic performances of the products are evaluated by monitoring their catalytic activities for degradation of methyl orange under UV light irradiation. The effects of calcination temperature and atmosphere on the photocatalytic performance are investigated. The results reveal that the photocatalytic activities of CS2/TiO2-NTs and Pb/CS2/TiO2-NTs are far higher than that of primary nanotubes, and the optimum calcination temperature is 500 °C under N2 atmosphere. It is also discovered that physically adsorbed Pb2+ ions affect the photocatalytic activity of Pb/CS2/TiO2-NTs obviously. The photocatalytic activity of washed Pb/CS2/TiO2-NTs is higher than that of the unwashed one under the same thermal treatment and reaction conditions.
Electro-optic (EO) polymers, possessing high EO coefficient and low dielectric constant, are considered to be a new generation of nonlinear optical materials that have great application prospect in photo-communication, information storage, and data processing. The host-guest structure of EO polymers is the most typical one in this field. However, the phase separation during polarization between the host polymer and the guest nonlinear optical molecule (NLO) limits potential applications of the material. To solve the problem, a new synthetic method was designed in this paper. First, 2,4-dinitroaniline was grafted to phenol polyphosphazene by chemical method for polar improvement of the main chain. Then, another small NLO molecule was mixed into the polymer by physical method for further improvement of EO coefficient. The preparation process was studied and the structure of the product was characterized. The effects of different NLO mixing proportions and different polarizing temperatures on EO coefficient were investigated in details. Orientation stability of the sample was tested. Experimental results show that our products possess not only high EO coefficient but also good phase stability, which makes them good candidates for the application in information technology.
He Zhang, Haiyan Wang, Hongyu Zhu, Hongtao Li, Taichao Su, Shangsheng Li, Meihua Hu and Haotian Fan
high power factor (S 2 σ) and low thermal conductivity is an effective way to achieve high-performance thermoelectric materials.
The rocksalt-structured lead-based chalcogenides, have been extensively studied as promising thermoelectric materials [ 1 , 6 - 9 ]. Especially lead telluride (PbTe), as one of the most frequently investigated materials in this system, remains the top-performing thermoelectric at midtemperature range (600 K to 900 K) [ 10 ]. However, Te is a scarce element in the crust of the earth (0.001 ppm by weight). Lead sulfide (PbS) is much less
In past decades, with increasing usage of various dangerous gases in many areas, a lot of efforts have been made for development of highly sensitive gas sensors in order to deal with security problems existing in environment, industry and daily life. The crucial works are exploring novel materials with excellent gas-sensing performance to meet these demands. Oxide semiconductor is a suitable material for gas sensor fabrication due to its low cost, physical and chemical stability, easy synthesis, environment-friendliness, high sensitivity and
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-Aguilar C., Alfonso I.: Elastic Modulus Estimation for Copper Syntactic Foams Reinforced with Iron Hollow Spheres of Different Wall Thicknesses. Journal of Materials Engineering and Performance, 28/1. (2019) 100–106. doi.org/10.1007/s11665-018-3827-3
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 Fiedler T., Taherishargh M., Krstulovic-Opara L., Vesenjak M
Cotton-like CoS cluster has been successfully synthesized via a simple one-step hydrothermal route assisted by diethylenetriamine (DETA) as a ligand and structure-directing agent. The structure and morphology of the product were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM) and N2 adsorption-desorption isotherm. The CoS sample which has a hexagonal phase without any impurities possesses a microscopic morphology made by cotton-like clusters. The as-fabricated CoS as a supercapacitor electrode presents desirable supercapacitive performance with a high specific capacitance (664 F∙g-1 at 0.5 A∙g-1), remarkable rate capability and excellent cycling stability (85.7 % specific capacitance retention after 1000 cycles), making it applicable as an electrode for high-performance supercapacitors.