Search results for: W.F. Zhang

Items from 1 to 20 out of 53 results

article

Unipolar resistance switching behavior of Pr4O7-Pr2CuO4-δ thin films

J.T. Yin, X.S Liu, L. Wei, Y.F. Yin, more

Thin Solid Films > 2016 > 619 > C > 174-178

Pr₄O₇-Pr₂CuO_4-δ (PCO) thin films were grown on Pt (Pt/Ti/SiO₂/Si) substrates by pulsed laser deposition and their resistive switching behavior was investigated. The resistance ratio RH/L (R_high/R_low) could be larger than 10⁴, which can be maintained up to 50cycles and 10⁴s without detectable degradation. The results show that the Pt/Pr₄O₇-PCO/Pt device possesses excellent endurance and retention properties...

article

Effect of top electrodes and light sources on photovoltaic properties of polycrystalline Bi4Ti3O12 film

K. Wang, H.W. Zheng, X.J. Li, G.L. Yuan, more

Materials Letters > 2016 > 179 > C > 182-185

Polycrystalline Bi₄Ti₃O₁₂ (BTO) film was deposited by a sol-gel method. Piezoelectric force microscopy measurement confirmed the local ferroelectricity of the BTO film. The band gap of the BTO film is estimated to be 3.45eV and the absorption intensity of Ag/BTO/FTO is larger than that of Pt/BTO/FTO. The photovoltaic (PV) properties of the two structures were measured under the illumination of white...

article

Photovoltaic effect of a bilayer film with Bi4Ti3O12/BiFeO3 heterostructure

J.X. Zhang, H.W. Zheng, Y.G. Zhang, G.L. Yuan, more

Materials Letters > 2015 > 156 > Complete > 98-100

Bi ₄ Ti ₃ O ₁₂ /BiFeO ₃ (BTO/BFO) heterostructure bilayer film is prepared on fluorine-doped tin oxide conductive glass by a sol–gel process. The X-ray diffraction result shows that no additional phase can be found besides the characteristic diffraction peaks of BTO and BFO. Piezoelectric force microscopy measurement confirms the complete domain switching and local...

article

Epitaxial properties of ZnO thin films on LaAlO3 substrates by pulsed laser deposition

C.H. Jia, S. Wang, Y.H. Wu, Y.H. Chen, more

Journal of Crystal Growth > 2015 > 421 > Complete > 19-22

Wurtzite ZnO thin films with different epitaxial relationships have been grown on (001)-, (011)-, and (111)LaAlO ₃ (LAO) single-crystal substrates by pulsed laser deposition. Nonpolar (112¯0)ZnO films with two orthogonal domains were obtained on (001) LAO, in which the in-plane orientation relationship is demonstrated to be 〈0001〉 _ZnO //〈110〉 _LAO . For ZnO on (011)- and (111)LAO...

article

Optical properties of MgxZn1−xO thin films deposited on silicon and sapphire substrate by rf magnetron sputtering

W.L. Guan, J. Lian, Y.X. Yu, Z.Z. Sun, more

Optik - International Journal for Light and Electron Optics > 2014 > 125 > 18 > 5167-5170

The index dispersion at UV–VIS range for polycrystalline Mg _x Zn _1−x O films on silicon with different Mg concentration was obtained by spectroscopic ellipsometry (SE) method. It decreases with the increase of the Mg content. Above the relative peak wavelength, they are well fitted by the first-order Sellmeier relation. The band gap of films on sapphire of different Mg content was...

article

Photovoltaic effects in Bi4Ti3O12 thin film prepared by a sol–gel method

Y.G. Zhang, H.W. Zheng, J.X. Zhang, G.L. Yuan, more

Materials Letters > 2014 > 125 > Complete > 25-27

Bi ₄ Ti ₃ O ₁₂ (BTO) film has been successfully fabricated on fluorine-doped tin oxide conductive glass substrate by the sol–gel technique. The optical band gap of 3.37eV can be estimated from the UV–vis absorption spectrum. Piezoelectric force microscopy measurement confirms the local ferroelecitity of the BTO film. Seen from the J–V curve, the short circuit photocurrent density...

article

Structural and electrical properties of four-layers Aurivillius phase BaBi3.5Nd0.5Ti4O15 ceramics

C.L. Diao, H.W. Zheng, Y.Z. Gu, W.F. Zhang, more

Ceramics International > 2014 > 40 > 4 > 5765-5769

A new compound of barium bismuth neodymium titanate BaBi _3.5 Nd _0.5 Ti ₄ O ₁₅ was synthesized using the traditional solid-state reaction method. X-ray diffraction analysis confirmed the compound to be a layered tetragonal structure and Raman spectrum indicated that Nd ions occupy the A site. The plate-like morphology with average grain size about 2–4μm was observed...

article

Local structure and magnetic properties of Co-doped 3C-SiC nanowires

H.W. Zheng, T.T. Zhao, Y. Tian, Z.H. Sun, more

Materials Letters > 2014 > 120 > Complete > 13-15

Co-doped 3C-SiC nanowires were synthesized using high-purity SiO, Co and carbon nanotubes as starting materials. The nanowires consist of cubic SiC with diameters ranging from 20 to 200nm and lengths up to tens of micrometers, High resolution transmission electron microscopy reveals that the nanowires preferentially grew along the [111] direction. Extended X-ray absorption fine structure (EXAFS) reveals...

article

Epitaxial growth of non-polar m-plane AlN film on bare and ZnO buffered m-sapphire

H.T. Wang, C.H. Jia, J.K. Xu, Y.H. Chen, more

Journal of Crystal Growth > 2014 > 391 > Complete > 111-115

Non-polar m-plane AlN films were grown epitaxially on bare and ZnO buffered m-plane sapphire by laser molecular beam epitaxy. Based on X-ray θ−2θ and Φ scanning results, the in-plane epitaxial relationships of AlN/sapphire and AlN/ZnO/sapphire are [0001] _AlN ∥[112¯0] _sapphire and [0001] _AlN ∥[0001] _ZnO ∥[112¯0] _sapphire , respectively. A direct epitaxy without...

article

Enhanced electrochemical performance of CoAl-layered double hydroxide nanosheet arrays coated by platinum films

J.P. Cheng, J.H. Fang, M. Li, W.F. Zhang, more

Electrochimica Acta > 2013 > 114 > Complete > 68-75

Three-dimensional network of cobalt and aluminum layered double hydroxide (LDH) nanosheets was synthesized on nickel foam by a simple hydrothermal method. The CoAl-LDH nonosheets were subsequently coated by ion sputtering with thin layers of Pt films to facilitate fast electron transport between current collector and the CoAl-LDH active materials. The optimal thickness of the Pt film acquiring the...

article

Dielectric and piezoelectric properties of cerium modified BaBi4Ti4O15 ceramics

C.L. Diao, J.B. Xu, H.W. Zheng, L. Fang, more

Ceramics International > 2013 > 39 > 6 > 6991-6995

Cerium modified barium bismuth titanate ceramics BaBi₄Ti₄O₁₅-xCeO₂ (wt%) were prepared by a solid-state reaction method. X-ray diffraction patterns showed that the ceramics have a four-layer Aurivillius-type structure with orthorhombic phase at room temperature. The plate-like morphology with average grain size about 2μm was observed by scanning electron microscope (SEM). The effects of cerium modification...

article

Enhanced visible light photocatalytic properties of AgNbO ₃ /AgSbO ₃ composites

G. Li, Y. Bai, W.F. Zhang, H. Zhang

Materials Chemistry and Physics > 2013 > 139 > 2-3 > 1009-1013

(AgNbO ₃ ) ₁ _- _x (AgSbO ₃ ) _x composites with the different molar ratios of AgSbO ₃ to AgNbO ₃ were prepared by a solid state reaction method. Composition dependence on the structure, optical properties and morphology was investigated by X-ray diffractometer, Raman spectroscopy, UV-vis spectroscopy and scanning electron microscope. The Rhodamine...

article

Room temperature ferromagnetism induced by N-ion implantation in 6H-SiC single crystal

Z.C. Lv, X.P. Ma, H.W. Zheng, R. An, more

Materials Letters > 2013 > 93 > Complete > 374-376

6H-SiC single crystal implanted with N ⁺ ions with an energy of 160keV and a dose of 1×10 ¹⁷ cm ⁻² at room temperature was analyzed by atomic force microscopy (AFM), positron annihilation lifetime spectroscopy (PALS) and superconducting quantum interference device (SQUID). AFM analysis results show the morphological characteristics of degraded implanted sample. PALS analysis...

article

Transparent conducting Sb-doped SnO2 thin films grown by pulsed laser deposition

Shihui Yu, Linghong Ding, Chuang Xue, Li Chen, more

Journal of Non-Crystalline Solids > 2012 > 358 > 23 > 3137-3140

Transparent conducting antimony-doped tin oxide (ATO) films have been deposited on quartz glass substrates by pulsed laser deposition. Various process parameters including oxygen partial pressure, substrate temperature, film thickness and Sb-doping level are analyzed for their effects on the structure and optoelectronic characteristics of ATO thin films. Under optimized deposition conditions, electrical...

article

High quality transparent conductive SnO2/Ag/SnO2 tri-layer films deposited at room temperature by magnetron sputtering

S.H. Yu, C.H. Jia, H.W. Zheng, L.H. Ding, more

Materials Letters > 2012 > 85 > Complete > 68-70

SnO ₂ /Ag/SnO ₂ tri-layer films were prepared on quartz glass substrates by RF magnetron sputtering of SnO ₂ and DC magnetron sputtering of Ag. The influence of Ag layer thickness on electrical and optical properties of the tri-layer film was investigated. Several analytical tools such as Hall measurements, four-point probe, field emission scanning electron microscopy (FE-SEM)...

article

Difference in valence band top of BiVO4 with different crystal structure

Guoqiang Li, Ying Bai, W.F. Zhang

Materials Chemistry and Physics > 2012 > 136 > 2-3 > 930-934

The BiVO ₄ samples with different crystal forms were selectively synthesized by a coprecipitation route. The XRD and Raman spectra reveal that the samples were crystallized in tetragonal zircon type, tetragonal scheelite type and monoclinic scheelite type. The optical band gaps of BiVO ₄ (t-z), BiVO ₄ (t-s) and BiVO ₄ (m-s) are 2.9, 2.6 and 2.45 eV, respectively. The...

article

Nitrogen and phosphorus use efficiencies and losses in the food chain in China at regional scales in 1980 and 2005

L. Ma, G.L. Velthof, F.H. Wang, W. Qin, more

Science of the Total Environment > 2012 > 434 > Complete > 51-61

Crop and animal production in China has increased significantly during the last decades, but at the cost of large increases in nitrogen (N) and phosphorus (P) losses, which contribute to ecosystem degradation and human health effects. This information is largely based on scattered field experiments, surveys and national statistics. As a consequence, there is as yet no comprehensive understanding of...

article

Microstructure and magnetic properties of Mn-doped 3C-SiC nanowires

Y. Tian, H.W. Zheng, X.Y. Liu, S.J. Li, more

Materials Letters > 2012 > 76 > Complete > 219-221

Single crystalline Mn-doped 3C-SiC nanowires were synthesized by high-purity Si, SiO ₂ , Mn and graphite powders. The scanning electron microscopy (SEM) results indicate that the diameter of the nanowires ranged from 30 to 200nm, with a length up to tens of micrometers. The results of high resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) indicate...

article

Growth of conductive and insulative highly-orientated aluminum nitride thin films using laser molecular beam epitaxy

Yonghui Wu, C.H. Jia, W.F. Zhang

Diamond & Related Materials > 2012 > 25 > Complete > 139-143

Conductive and insulative highly-orientated aluminum nitride thin films were grown on Si (111) and sapphire (0001) substrates using laser molecular beam epitaxy by only changing the nitrogen pressure. The microstructure of AlN films was characterized by X-ray diffraction and scanning electron microscopy, while the electrical and optical properties were measured by current–voltage, capacitance–voltage...

article

Effect of incorporating copper on resistive switching properties of ZnO films

C.H. Jia, Q.C. Dong, W.F. Zhang

Journal of Alloys and Compounds > 2012 > 520 > Complete > 250-254

Undoped and copper-doped ZnO (ZnO:Cu) thin films of wurtzite structure with c-axis orientation were grown on F-doped SnO ₂ (FTO) substrates by pulsed laser deposition. Typical bipolar and reversible resistance switching effects were observed in these films, and the ratio of high and low resistance state (ON/OFF ratio) increases abruptly by introducing Cu. Based on the impedance spectra of...

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INFONA - science communication portal

Search results for: W.F. Zhang

Unipolar resistance switching behavior of Pr4O7-Pr2CuO4-δ thin films

Effect of top electrodes and light sources on photovoltaic properties of polycrystalline Bi4Ti3O12 film

Photovoltaic effect of a bilayer film with Bi4Ti3O12/BiFeO3 heterostructure

Epitaxial properties of ZnO thin films on LaAlO3 substrates by pulsed laser deposition

Optical properties of MgxZn1−xO thin films deposited on silicon and sapphire substrate by rf magnetron sputtering

Photovoltaic effects in Bi4Ti3O12 thin film prepared by a sol–gel method

Structural and electrical properties of four-layers Aurivillius phase BaBi3.5Nd0.5Ti4O15 ceramics

Local structure and magnetic properties of Co-doped 3C-SiC nanowires

Epitaxial growth of non-polar m-plane AlN film on bare and ZnO buffered m-sapphire

Enhanced electrochemical performance of CoAl-layered double hydroxide nanosheet arrays coated by platinum films

Dielectric and piezoelectric properties of cerium modified BaBi4Ti4O15 ceramics

Enhanced visible light photocatalytic properties of AgNbO ₃ /AgSbO ₃ composites

Room temperature ferromagnetism induced by N-ion implantation in 6H-SiC single crystal

Transparent conducting Sb-doped SnO2 thin films grown by pulsed laser deposition

High quality transparent conductive SnO2/Ag/SnO2 tri-layer films deposited at room temperature by magnetron sputtering

Difference in valence band top of BiVO4 with different crystal structure

Nitrogen and phosphorus use efficiencies and losses in the food chain in China at regional scales in 1980 and 2005

Microstructure and magnetic properties of Mn-doped 3C-SiC nanowires

Growth of conductive and insulative highly-orientated aluminum nitride thin films using laser molecular beam epitaxy

Effect of incorporating copper on resistive switching properties of ZnO films

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