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Tai'an, China

Shi Z.-Q.,Nanjing University | Shi Z.-Q.,Taishan University | Guo Z.-J.,Nanjing University | Zheng H.-G.,Nanjing University
Chemical Communications | Year: 2015

Two luminescent Zn(ii) metal-organic frameworks were prepared from a π-conjugated thiophene-containing carboxylic acid ligand. These two MOFs show strong luminescene and their luminescence could be quenched by a series of nitroaromatic explosives. Importantly, they exhibit very highly sensitive and selective detection of picric acid compared to other nitroaromatic explosives. © 2015 The Royal Society of Chemistry.

Zheng Z.-B.,Beijing Normal University | Zheng Z.-B.,Taishan University | Duan Z.-M.,Beijing Normal University | Ma Y.-Y.,Beijing Normal University | Wang K.-Z.,Beijing Normal University
Inorganic Chemistry | Year: 2013

The anion-interaction properties of a Ru(II) complex of [Ru(bpy) 2(Htppip)](ClO4)2·H2O· DMF (RuL) {bpy =2,2′-bipyridine and Htppip =2-(4-(2,6-di(pyridin-2-yl) pyridin-4-yl)phenyl)-1H-imidazo[4,5-f][1,10]phenanthroline} were thoroughly investigated in CH3CN and CH3CN/H2O (50:1, v/v) solutions by UV-visible absorption, emission, and 1H NMR spectra. These analyses revealed that RuL acts as an efficient "turn on" emission sensor for H2PO4 -, and a "turn off" sensor for F- and OAc-; in addition, RuL exhibited slightly disturbed emission spectra in the presence of the other anions studied (Cl-, Br-, I-, NO 3 -, and ClO4 -). The cation-sensing properties of RuL were also studied in both neat CH3CN and aqueous 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid buffer (pH = 7.2)/CH 3CN (71/1, v/v) solutions. RuL was found to exhibit a colorimetric sensing ability that was highly selective for Fe2+, as evidenced by an obvious color change from pale yellow to light red-purple to the naked eye over the other cations studied (Na+, Mg2+, Ba 2+, Mn2+, Fe3+, Co2+, Ni 2+, Cu2+, Zn2+, Cd2+, Hg 2+, and Ag+). To obtain insights into the possible binding modes and the sensing mechanisms, 1H NMR spectral analysis, luminescence lifetime measurements, and density functional theoretical calculations were also performed. © 2013 American Chemical Society.

Wang L.,CAS Changchun Institute of Applied Chemistry | Wang L.,University of Chinese Academy of Sciences | Zhuo L.,Taishan University | Zhang C.,CAS Changchun Institute of Applied Chemistry | Zhao F.,CAS Changchun Institute of Applied Chemistry
Chemistry - A European Journal | Year: 2014

A composite of highly dispersed Fe3O4 nanoparticles (NPs) anchored in three-dimensional hierarchical porous carbon networks (Fe 3O4/3DHPC) as an anode material for lithium-ion batteries (LIBs) was prepared by means of a deposition technique assisted by a supercritical carbon dioxide (scCO2)-expanded ethanol solution. The as-synthesized Fe3O4/3DHPC composite exhibits a bimodal porous 3D architecture with mutually connected 3.7 nm mesopores defined in the macroporous wall on which a layer of small and uniform Fe3O 4 NPs was closely coated. As an anode material for LIBs, the Fe 3O4/3DHPC composite with 79 wt % Fe3O 4 (Fe3O4/3DHPC-79) delivered a high reversible capacity of 1462 mA h g-1 after 100 cycles at a current density of 100 mA g-1, and maintained good high-rate performance (728, 507, and 239 mA h g-1 at 1, 2, and 5 C, respectively). Moreover, it showed excellent long-term cycling performance at high current densities, 1 and 2 A g-1. The enhanced lithium-storage behavior can be attributed to the synergistic effect of the porous support and the homogeneous Fe 3O4 NPs. More importantly, this straightforward, highly efficient, and green synthetic route will definitely enrich the methodologies for the fabrication of carbon-based transition-metal oxide composites, and provide great potential materials for additional applications in supercapacitors, sensors, and catalyses. Expansion plan: A simple, efficient, and green strategy for the synthesis of Fe3O4 nanoparticles anchored in three-dimensional hierarchical porous carbon networks with the assistance of CO2-expanded ethanol has been developed. The composites exhibited high reversible capacity, good long-term stability, and good rate capability for Li-ion batteries (see figure). © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Ma S.,Taishan University
International Journal of Modern Physics B | Year: 2015

The theoretical calculations indicate that the metal-doped boron nitride (BN) sheets are potential materials to store the hydrogen and tune the bandgap. It is all known that the BN sheet is a nonmagnetic wide-bandgap semiconductor. Using density function theory (DFT), the lattice parameters of Cr-doped BN sheets are optimized, which are still kept on two-dimensional (2D) planar geometry, and the bandgap and H2 storage are studied. The simulation results show that the H2 molecule can be easily absorbed by Cr-doped N in BN sheet. As the adsorption energy was greatly decreasing with the increasing number of Cr-doped N, B had an affinity for adsorption of H2. With the increase of Cr doping, the bandgap of Cr-doped BN sheet is decreasing. The bandgap decreases from 4.705 eV to 0.08 eV. So Cr-doped BN sheet is a promising material in storing H2 and tuning the bandgap. © 2015 World Scientific Publishing Company.

Cobblestone-like ZnO/Au nanocomposites have been synthesized via a simple and practical nonaqueous synthetic strategy at room temperature. The structure, composition, morphology, and optical properties were characterized by X-ray diffraction, energy-dispersive X-ray spectroscopy, electron microscopy, and spectroscopic techniques. The results showed that the products were composed of metallic Au and ZnO components; spherical Au nanoparticles were attached to the ZnO supports; ZnO/Au hybrid nanostructures exhibited tunable optical properties. Moreover, these ZnO/Au nanohybrids were found to possess more efficient photocatalytic activity toward photodegradation of RhB than that of pure ZnO structure, which holds promise for applications in environmental remediation and water treatment. © 2014 Elsevier B.V. All rights reserved.

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