Yidong Zhang

Xuchang University, Syuychan, Henan Sheng, China

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Publications (26)43.06 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, Pt-Co3O4 nanocomposite was synthesized by a sol-gel process combined with electrodeposition method. Its electrocatalytic activity towards methanol oxidation was investigated at room temperature using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and current density-time curve. It is found that the resultant Pt-Co3O4 catalysts with minute amount of Pt exhibite at tractive electrocatalytic activity for methanol oxidation reaction (MOR) but with a high resistance CO poisoning due to the synergistic effects from Pt and Co3O4. Together with the low manufacturing cost of Co3O4, the reported nanostructured Pt-Co3O4 catalyst is expected to be a promising electrode material for direct methanol fuel cells (DMFC).
    11/2013; 5(4). DOI:10.5101/nml.v5i4.p296-302
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    ABSTRACT: CdS nanostructured thin films have been directly fabricated on indium-tin oxide (ITO) glass substrates through a one-step solvothermal process involving a cadmium nanocrystal layer and sulfur powder in N,N-dimethyl formamide (DMF). Poly(3-hexylthiophene) (P3HT) was then infiltrated into the CdS framework. The CdS film and the CdS–P3HT hybrid film were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), photoluminescence spectroscopy (PL) and UV-vis spectroscopy. CdS–P3HT hybrid film exhibited a wider absorption in the solar spectrum and stronger photo-current response and external quantum efficiency than a pure CdS and P3HT film. Hybrid solar cell devices have been constructed based on the CdS–P3HT hybrid film with structure ITO–CdS–P3HT–Au. The effects of sulfur sources, solvent and thickness of elemental cadmium films on the photovoltaic performance of CdS–P3HT hybrid solar cells were assessed.
    New Journal of Chemistry 09/2013; 37(10). DOI:10.1039/C3NJ00538K · 3.16 Impact Factor
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    ABSTRACT: In this paper, we described how WO3 microspheres have been synthesized by a simple hydrothermal treatment from the precursor of Na2WO4 and CO (NH2)2 at 160 °C for 3 h. The sample was characterized by X-ray diffraction (XRD), energy dispersive spectrum (EDS), scanning electronic microscopy (SEM), transmission electronic microscopy (TEM), high resolution transmission electronic microscopy (HRTEM), selected area electron diffraction (SAED), and X-ray photoelectron spectroscopy (XPS). Obtained results indicated that the average diameter of the as-prepared WO3 microspheres is ∼1 μm with orthorhombic phase. The WO3 microspheres are constructed of polycrystalline WO3 nanoparticles. The thickness of the WO3 coating of the gas sensor is ∼2 μm. The WO3-based gas sensor exhibited a good sensitivity and high selectivity to acetone vapor at 200 °C. A possible mechanism for the acetone vapor gas sensing was proposed.
    Vacuum 09/2013; 95:30–34. DOI:10.1016/j.vacuum.2013.02.005 · 1.43 Impact Factor
  • Yidong Zhang, Weiwei He, Huimin Jia
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    ABSTRACT: In this work, CuInS2 (CIS) particles were prepared by a simple hydrothermal method using the precursors of Cu(NO3)2, In(NO3)3 and CS(NH2)2 in aqueous solution at 160 °C for 2 h, followed by a spin coating process on the quartz substrate, so a CIS thin film was obtained. The CIS film was analyzed by means of a transmission electron microscope, an atomic force microscope, x-ray diffraction, energy dispersive spectroscopy, x-ray photoelectron spectroscopy and UV–visible absorption spectroscopy. The results show that the even and compact CIS thin film is composed of particles with a regular morphology and a uniform size distribution, with chalcopyrite structure. The crystalline quality of CIS film is significantly improved, growing along the (112) orientation. Its composition is close to the stoichiometric ratio (1:1:2) of the single CIS phase. Besides, the CIS thin film has an obvious absorption in the visible light region, and the band gap energy of the CIS film is approximately 1.40 eV. The method provides a potential new approach to fabricating CIS thin film applied in the field of solar cells.
    Physica Scripta 06/2013; 88(1):015705. DOI:10.1088/0031-8949/88/01/015705 · 1.03 Impact Factor
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    ABSTRACT: In this study, a three-dimensional (3D) nano/micropeony-like hierarchical Cu2 − xSe has been synthesized by a one-step solvothermal method with ethylenediamine and ethylene glycol as mixed solvents. The 3D copper foam was selected as sacrificial template, and the aqueous solution of mixture Na2SeO3 and Na2Se was chosen as a suitable selenium source for this reaction. Note that 3D Cu2 − xSe nano/micro architectures are rarely reported in previous studies. Meanwhile, the 3D template can provide a more stable environment and huge specific surface area, which lead to more stable and regular Cu2 − xSe grown in situ. Every nanoflake of the uniform Cu2 − xSe hierarchical structures is about 5 μm in diameter and 50 nm in thickness. These nanoflakes can be used as a Fenton-like catalyst for the degradation of Methylene Blue and Rhodamine B dye solution without any kind of light source and thus obtain good effect.
    Thin Solid Films 05/2013; 534:22–27. DOI:10.1016/j.tsf.2013.01.005 · 1.87 Impact Factor
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    ABSTRACT: CuS–ZnO nanocomposite films were prepared by a simple sol–gel process. The microstructure, morphology, and tribological properties of the prepared films were investigated via X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), scanning electron microscopy (SEM), and by an UMT-2 tribometer. Results show that the films are uniform and compact with hexagonal ZnO phase. The films display excellent wear resistance and friction-reduction performance. Particularly, the molar ratio of 5% CuS of sample “c” obtains the best result. Frictional trace observation suggests that the wear mechanism of the film has slight scuffing, adhesion, and abrasion.
    Tribology International 02/2013; 58:7–11. DOI:10.1016/j.triboint.2012.09.004 · 2.12 Impact Factor
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    ABSTRACT: In this work, ZnO coatings were fabricated by the RF-sputtering method on quartz substrates in an inert gas ambient of Ar followed by a thermal oxidation process in air at different temperatures. The effect of thermal oxidation temperatures on the structures and photoluminescence (PL) properties of the coatings were studied. The structural characteristics of the samples were analyzed by X-ray diffraction (XRD) and atomic force microscope (AFM). The PL spectra were obtained by using a Xe laser as a light source with an excitation wavelength of 325 nm at room temperature. The force-curves were obtained by AFM. The results show that all the prepared ZnO coatings have a compact hexagonal wurtzite structure. With the increasing annealing temperature from 400 °C to 600 °C, the particle size, surface RMS roughness, photoluminescence intensity and adhesion force of the prepared ZnO coatings were increased as well.
    Optics Communications 10/2012; 285(s 21–22):4290–4293. DOI:10.1016/j.optcom.2012.06.068 · 1.54 Impact Factor
  • Yidong Zhang, Liwei Mi
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    ABSTRACT: A superhydrophobic ZnS film was successfully fabricated by a simple solvothermal method using Zn foil and S powder as raw materials in an absolute ethanol solution at 160 degrees C for 8 h. The products were characterized by X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and contact angle (CA) measurements. The results show that the obtained ZnS film was hexagonal phase, composed of many dense and uniform interconnected nanoflakes of average thickness ca. 120 nm. A possible reaction mechanism was proposed and discussed. It was found that the ZnS film exhibits superhydrophobicity owing to its special nanoflake structure.
    Chemistry Letters 09/2012; 41(9):915-916. DOI:10.1246/cl.2012.915 · 1.30 Impact Factor
  • Yidong Zhang, Liwei Mi, Qingyu Li, Zhi Zheng
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    ABSTRACT: In the work, the ZnO films were fabricated using the glucose-assisted sol–gel method under different precursor concentrations. The ZnO films were composed of many ZnO nanoparticles with polycrystalline hexagonal wurtzite structure. Its frictional, adhesive properties and interface contact types between the atomic force microscope tip and the samples were investigated based on Amonton's laws and the general Carpick's transition equation, respectively. The results showed that the tip–sample contacts corresponded to the Johnson–Kendall–Robert/Derjaguin–Muller–Toporov (DMT) transistion model for ZnO films. Frictional forces for the four samples were linearly dependent on external loads and adhesive forces at higher loads and lower loads, respectively. Frictional tests showed that sample “b” exhibited the highest nano-frictional coefficient due to the highest capillary force formed on the ZnO surface. The ZnO sol–gel film might be promising for applications in the lubrication of nano/micro electromechanical systems.
    Wear 07/2012; s 294–295:313–318. DOI:10.1016/j.wear.2012.07.012 · 1.86 Impact Factor
  • Yidong Zhang, Liwei Mi, Zhi Zheng
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    ABSTRACT: Zn1−xCuxO thin films (x=0, 1.0, 3.0, 5.0%) are prepared on quartz substrate by sol–gel method. The structure and morphology of the samples are investigated by X-ray diffraction (XRD) and atomic force microscopy (AFM). The results show that Cu ions were effectively penetrated into the ZnO crystal lattices with substitutional and interstitial impurities to form stable solid solutions without changing the polycrystalline wurtzite structure. Two peaks at 420 nm (2.95 eV, violet), 485 nm (2.56 eV, blue) have been observed from the photoluminescence (PL) spectra of the samples. It is concluded that the violet peak may correspond to the exciton emission; the blue emission corresponds to the electron transition from the bottom of the conduction band to the acceptor level of zinc vacancy. The optical test shows that the optical band gap Eg is decreased with the increase amount of Cu doping in ZnO. The band gap decrease from 3.40 eV to 3.25 eV gradually. It is also found that the transmission rate is increased rapidly with the increase of Cu ions concentration.
    Physica B Condensed Matter 06/2012; 407(12):2254–2257. DOI:10.1016/j.physb.2012.03.009 · 1.28 Impact Factor
  • Yidong Zhang, Qingyu Li
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    ABSTRACT: Zinc oxide microrods (MRs) were successfully prepared without the addition of template and additive by a simple hydrothermal route using only Zn(CH3COO)2·2H2O as a precursor at 160 °C for 3 h. Interestingly, the ZnO MRs can be transformed to ZnS microspheres (MSs) with the sulfur source of thiourea under the same conditions. The products were characterized by X-ray diffraction (XRD), energy-dispersive spectrum (EDS), and scanning electron microscopy (SEM). Results show that the obtained ZnO MRs and ZnS MSs belonged to hexagonal phase and cubic phase, respectively. A possible reaction mechanism is proposed and discussed.
    Chemistry Letters 05/2012; 41(5):493-494. DOI:10.1246/cl.2012.493 · 1.59 Impact Factor
  • Xinmin Wang, Chengqun Yu, Junxi Wu, Yidong Zhang
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    ABSTRACT: Zinc oxide microrods with controlled diameter were prepared without the addition of template and additive by a simple hydrothermal route only using Zn(CH3COO)2·2H2O as a precursor. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and electron diffraction (ED). The crystal structure of prepared ZnO microrods is hexagonal phase polycrystalline with zincite structure. With the increase of the precursor concentration from 0.05 M to 0.6 M, the diameter of the ZnO microrods increased from 1 μm to 5 μm. A localized oriented attachment mechanism was prepared to account for the formation of ZnO microrods. The gas-sensing performance experiments indicated that the prepared ZnO microrods exhibited highly sensitive, selective gas-sensing properties, and good stability to acetone vapor. The response and recovery time of ZnO-based gas sensor to 100 ppm acetone vapor are 12 s and 18 s, respectively. The mechanism of the ZnO-based sensor was investigated.
    Ionics 02/2012; 19(2). DOI:10.1007/s11581-012-0714-z · 1.84 Impact Factor
  • Yidong Zhang, Weiwei He
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    ABSTRACT: Purpose – The purpose of this paper is to demonstrate the I-V characteristics of ZnO film on Si substrates with Ag buffer layer by conductive atomic force (C-AFM). Design/methodology/approach – An Ag buffer layer and Zn film was first deposited on silicon substrate by RF-sputtering deposition method from high pure Ag and Zn target, respectively. Then, the deposited film was sintered in air at 500°C for 1?h. Findings – The structures and morphologies of the prepared films were characterized by X-ray diffraction (XRD), energy dispersive spectrum (EDS), atomic force microscopy (AFM), and C-AFM. The results show that the prepared ZnO films with Ag buffer layer have a good crystallinity and surface morphology. Interestingly, the I-V curve of ZnO film exhibited typical characteristics of semi-conductive oxide under the conductive Ag buffer layer. Originality/value – The paper demonstrates, by C-AFM, that the ZnO/Ag-buffer/Si exhibits excellent crystal structure, morphology and typical I-V characteristics.
    Microelectronics International 01/2012; 29(1):35-39. DOI:10.1108/13565361211219149 · 0.87 Impact Factor
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    ABSTRACT: Tungsten trioxide (WO3) films with novel dandelion-like structures were prepared by spin-coating a sol of WO3 with CTAB (cetyltrimethyl ammonium bromides) on quartz substrates. The resultant WO3 films were characterized by X-ray diffraction (XRD), FT-IR spectroscopy, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The wettabilities of the WO3 films were evaluated by contact angle (CA) measurements. It was found that the WO3 film exhibited superhydrophilicity under UV light irradiation, whereas after storage in the dark for a certain time, it turned to be superhydrophobic.
    Zeitschrift für anorganische Chemie 01/2012; 638(1):231-235. DOI:10.1002/zaac.201100392 · 1.25 Impact Factor
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    ABSTRACT: In this work, we demonstrate the influence of an Au buffer layer on the structure and photoluminescence (PL) properties of ZnO sol–gel thin films on Si substrates. An Au layer was deposited on the silicon substrate by the evaporation deposition method from highly pure Au (99.99%) wires. Then, a ZnO film was prepared by the sol–gel method with spin-coating technology, followed by calcinations in air at 600 °C for 1 h. The structures and morphologies of the prepared films were characterized by x-ray diffraction, energy dispersive spectrum analysis, atomic force microscopy and PL. The results show that the prepared ZnO thin film with an Au buffer layer exhibits good crystallinity and surface morphology compared with that without an Au buffer layer. Interestingly, different from other previous reports on buffer layers with PL-enhanced properties, the ZnO thin film with Au buffer layer showed an obvious violet PL-quenched property.
    Physica Scripta 09/2011; 84(4):045402. DOI:10.1088/0031-8949/84/04/045402 · 1.03 Impact Factor
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    ABSTRACT: For the first time, ternary CuAgSe dendrites on a Ag foil substrate have been synthesized at room temperature by inheriting the dendritic structures of Ag2Se nanocrystals, and Cu nanoparticles and Se powders were used to feed the growth in aqueous ammonia solution. The new nano approach for the fabrication of CuAgSe dendrites can be regarded as a successful chemical alternative to the recently developed technique for electrochemical atomic layer epitaxy deposition for chalcogenides. The transformation process and mechanism from the binary Ag2Se phase to the ternary CuAgSe phase are discussed along with analysis their of thermodynamic, kinetic, and crystallographic properties.
    Berichte der deutschen chemischen Gesellschaft 09/2011; 2011(27). DOI:10.1002/ejic.201100440 · 2.97 Impact Factor
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    ABSTRACT: ZnS hollow microspheres were synthesized by a dl-aspartic acid mediated hydrothermal route. dl-aspartic acid plays an important role as crystal growth soft template, which regulates the release of Zn2+ ions for the formation of ZnS hollow spheres. The formation of these hollow spheres was mainly attributed to an Ostwald ripening process. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), electron diffraction (ED), UV/Vis spectroscopy (UV), and photoluminescence (PL). The shells of the microspheres were composed of ZnS quantum dots (QDs) with the average size of 2.31 nm. The average microspheres diameter is 0.5–3.5 μm. The shell thickness of the hollow sphere is ≈300 nm. The optical bandgap energy increased significantly compared to the bulk ZnS material due to the strong quantum confinement effect. Two strong emissions at ≈425 nm and ≈472 nm in the photoluminescence (PL) spectrum of ZnS hollow microspheres indicate strong quantum confinement because of the presence of QDs.
    Zeitschrift für anorganische Chemie 09/2011; 637(11). DOI:10.1002/zaac.201100169 · 1.25 Impact Factor
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    ABSTRACT: The cellulose was grafted homogeneously with acrylic acid by in situ polymerization in an ionic liquid 1-butyl-3-methylimidazolium iodide ([Bmim]I) as reaction medium. This polymer is suitable for quasi-solidification of electrolytes in DSSCs by in situ synthesis because the polymerization reaction proceeds in the ionic liquid containing iodide ion. Using the matrix as polymer host, KI and I2 as ionic conductors, an ionic conductivity of the gel polymer electrolyte was achieved 7.33 mS cm−1. Based on the optimized gel electrolyte, the best result of the quasi-solid state dye-sensitized solar cell (QS-DSSC) was the light-to-electricity conversion efficiency of 5.51% under a light intensity of 100 mW cm−2 (AM 1.5).Highlights► The grafted cellulose was prepared in an ionic liquid as reaction medium. ► The QS-DSSCs were assembled with the gel grafted cellulose electrolytes. ► The general behavior of impedance spectra was similar for gel or liquid electrolyte. ► The best result of the QS-DSSC was the photoelectric conversion efficiency of 5.51%.
    Carbohydrate Polymers 08/2011; 86(3):1216-1220. DOI:10.1016/j.carbpol.2011.06.017 · 3.92 Impact Factor
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    ABSTRACT: In this article, the authors describe how WO3 nanoparticles have been synthesized by sol-gel treatment from the precursor of W powder and H2O2 at room temperature, followed by sintering at 400°C, 600°C, 800°C, and 1000°C for 1 h, respectively. The samples were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Obtained results indicated that the gas-sensing properties to ethanol were decreased with the increasing sintering temperature from 400°C to 1000°C. The effects of sintering temperature on the gas-sensing characteristics of the WO3 ceramics were also investigated. The sensor that sintered at 400°C exhibited the maximum sensitivity to ethanol vapor at the operating temperature of 300°C. A possible mechanism for the influence of sintering temperature on the ethanol-sensing properties of WO3 sensors was proposed.
    Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry 07/2011; Metal-Organic(6-and Nano-Metal Chemistry):639-643. DOI:10.1080/15533174.2011.568454 · 0.52 Impact Factor
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    ABSTRACT: Zinc sulfide (ZnS) microspheres were synthesized by a self-template hydrothermal route using thiourea as sulphur source. The formation of these hollow spheres was mainly attributed to the oriented aggregation of ZnS nanocystals around the gas-liquid interface between gas (H2S, NH3, or CO2) and water followed by an Ostwald ripening process. The gas bubbles of H2S, NH3, or CO2 produced during the reaction might play a soft-template to form ZnS hollow microspheres. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), electron diffraction (ED), and photoluminescence (PL). The crystal structure of prepared ZnS microspheres is hexagonal phase polycrystalline. The average microspheres diameter is 1.5 - 6 µm. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
    Crystal Research and Technology 07/2011; 46(7). DOI:10.1002/crat.201100132 · 1.16 Impact Factor