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Yuan Y.,Key Laboratory for Soft Chemistry and Functional Materials | Xu H.,Nanjing University of Science and Technology | Meng X.,Key Laboratory for Soft Chemistry and Functional Materials | Han Q.,Key Laboratory for Soft Chemistry and Functional Materials
Materials Science- Poland | Year: 2015

Highly dispersed olive-like NiS particles were synthesized in a liquid-liquid biphasic system at room temperature, where nickel xanthate in organic solvents (toluene and benzene) and sodium sulfide in water solution were used as nickel and sulfide sources, respectively. NiS particles were formed at the stabilized phase interface. The structures, chemical composition and optical characteristics of the products were investigated by transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy and ultraviolet-visible spectroscopy. The organic solvents obviously influenced the morphology of the NiS particles. The olive-like NiS with smooth surface and sharp ends was obtained at benzene/water interface, while spindle-like NiS particles with rough surface and circle ends were formed when using toluene as a solvent. Analogously, chainlike Bi2S3 nanowires were produced at chloroform/water interface. The effect of the experiment parameters including reaction time, solvent and concentration of reactants on the size and morphology of the products was discussed in detail and a possible formation mechanism was suggested. © Wroclaw University of Technology.


Wu L.,Key Laboratory for Soft Chemistry and Functional Materials | Xu H.,Nanjing University of Science and Technology | Han Q.,Key Laboratory for Soft Chemistry and Functional Materials | Wang X.,Key Laboratory for Soft Chemistry and Functional Materials
Journal of Alloys and Compounds | Year: 2013

The double cauliflower-like Sb2S3 superstructures assembled by nanorods were prepared using SbCl3 and Na 2S×9H2O as raw materials, dodecyltrimethylammonium bromide (DTAB, C15H31BrN) as surfactant under acidic condition at 180 C for 30 h. The structure, morphology and composition of the product were characterized by X-ray diffraction pattern (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy diffraction spectroscopy (EDS). The effect of reaction conditions including temperature, reaction time and surfactants on the sample morphology was discussed and a possible mechanism for the formation of cauliflower-like Sb2S3 was proposed. The cauliflower-like Sb2S3 microcrystallines revealed broad spectrum response, which may have a good application prospect in solar energy utilization and photoelectric conversion fields. © 2013 Elsevier B.V. All rights reserved.


Meng X.,Key Laboratory for Soft Chemistry and Functional Materials | Zhu J.,Key Laboratory for Soft Chemistry and Functional Materials | Bi H.,Key Laboratory for Soft Chemistry and Functional Materials | Fu Y.,Key Laboratory for Soft Chemistry and Functional Materials | And 2 more authors.
Journal of Materials Chemistry A | Year: 2015

Graphene and its functionalized derivatives like graphene oxide (GO) have become handy and convenient building blocks for self-assembly to fabricate graphene-based functional materials with three-dimensional (3D) macroscopic structures. Herein, a convenient one-step hydrothermal method for preparing Ni(OH)2/graphene composite hydrogels (NGHs) with interconnected networks is described. This procedure includes the reduction of GO sheets by hydrazine and the in situ deposition of Ni(OH)2 nanoplates on graphene sheets. Notably, the obtained NGH7.5 (the calculated mass ratio of formed Ni(OH)2 with GO is 7.5:1) can offer a high specific capacitance of 1125.4 F g-1 at a charge/discharge rate of 0.5 A g-1, which is almost 2.2 times and 8.1 times higher than Ni(OH)2 and graphene, respectively. Meanwhile, the NGHs also present stable cycling performances with 87.3% capacitance retention after 1000 cycles, which are significantly higher than that of its counterparts of Ni(OH)2. More interestingly, the 3D structure of the NGH can be easily transmitted to NiO/graphene (NiO/G) composites utilizing a facile thermal treatment procedure. The electrode based on the NiO/G composite delivers a discharge capacity of 1349 mA h g-1 and a charge capacity of 992 mA h g-1 at the 1st cycle with a coulombic efficiency of about 73.5%. This work opens a considerable way to fabricate functional graphene-based 3D structures and their composite materials, and makes a significant contribution to energy storage/conversion from alternative energy sources. © 2015 The Royal Society of Chemistry.

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