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  • 1
    Language: English
    In: Journal of Colloid And Interface Science, March 1, 2013, Vol.393, p.92(5)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jcis.2012.10.065 Byline: Lihua Gao (a), Qingling Sun (a), Kezhi Wang (b) Keywords: Polyoxometalate; Hemicyanine; Self-assembled film; Photoelectrochemical property Abstract: Display Omitted Author Affiliation: (a) Department of Chemistry, School of Science, Beijing Technology and Business University, Beijing 100048, China (b) College of Chemistry, Beijing Normal University, Beijing 100875, China Article History: Received 4 September 2012; Accepted 25 October 2012
    ISSN: 0021-9797
    Source: Cengage Learning, Inc.
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  • 2
    Language: English
    In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, April 20, 2013, Vol.423, p.162(8)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.colsurfa.2013.02.006 Byline: Lihua Gao (a), Qingling Sun (a), Xiaoyan Lin (a), Jianmin Qi (a), Kezhi Wang (b) Abstract: Three electrostatically self-assembled films made of [P.sub.2W.sub.18Zn.sub.4(H.sub.2O).sub.2O.sub.68].sup.10- (P.sub.2W.sub.18Zn.sub.4) and a hemicyanine dimer linked by varied alkyl chain lengths, were uniformly prepared with large bathochromic shifts compared to the hemicyanine aqueous solutions. A 3-layer film gave stable, large cathodic photocurrent densities of 13.7[mu]A/cm.sup.2 at an applied potential of -0.3V vs. saturated calomel electrode. Display Omitted Author Affiliation: (a) Department of Chemistry, School of Science, Beijing Technology and Business University, Beijing 100048, People's Republic of China (b) College of Chemistry, Beijing Normal University, and Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing 100875, People's Republic of China Article History: Received 9 December 2012; Revised 27 January 2013; Accepted 2 February 2013
    Keywords: Alkyl Groups -- Analysis
    ISSN: 0927-7757
    Source: Cengage Learning, Inc.
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  • 3
    Language: English
    In: Journal of colloid and interface science, 2013, Vol.393, pp.92-96
    Description: A series of photoelectric conversion films consisting of sandwich-type polyoxometalates [P₂W₁₈M₄(H₂O)₂O₆₈]¹⁰⁻ (P₂W₁₈M₄, M=Ni, Cu, Zn) and a bichromophore hemicyanine of (E)-1,1′-(hexane-1,6-diyl)bis(4-(4-(dimethylamino)styryl)pyridinium) bromide (H⁶) were prepared on quartz and indium–tin–oxide (ITO)-coated glass substrates by electrostatic self-assembly. The UV–visible absorption spectroscopy showed that the films were uniformly deposited with the visible absorption bands for H⁶ in the films exhibiting different extents of bathochromic shifts with respect to H⁶ aqueous solution. The (P₂W₁₈M₄/H⁶)ₙ films exhibited cathodic photocurrents as irradiated with white light. The photocurrent action spectra were found to match with the absorption spectra of the films, indicating that the cathodic photocurrents were generated based on intramolecular charge transfer excitation of the H⁶ in the films. The photocurrents were found to strongly depend on the transition metal ions M in (P₂W₁₈M₄/H⁶)ₙ films. The effects of applied bias voltages, electron acceptor added in the electrolyte, and layer numbers of the films on photocurrent generation of (P₂W₁₈M₄/H⁶)ₙ films were also examined, and photoelectric mechanism discussed. ; p. 92-96.
    Keywords: Zinc ; Electric Power ; Absorption ; Copper ; Metal Ions ; Glass ; Quartz ; Electrolytes ; Aqueous Solutions ; White Light ; Spectroscopy
    ISSN: 0021-9797
    Source: AGRIS (Food and Agriculture Organization of the United Nations)
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  • 4
    Language: English
    In: Journal of Colloid And Interface Science, 01 March 2013, Vol.393, pp.92-96
    Description: ► Electrostatically self-assembled films from polyoxometalates and hemicyanine. ► Transition metals in polyoxometalates strongly affected large cathodic photocurrents. ► Bathochromic shift in the visible absorption band of the films. A series of photoelectric conversion films consisting of sandwich-type polyoxometalates [P W M (H O) O ] (P W M , M = Ni, Cu, Zn) and a bichromophore hemicyanine of ( )-1,1′-(hexane-1,6-diyl)bis(4-(4-(dimethylamino)styryl)pyridinium) bromide (H ) were prepared on quartz and indium–tin–oxide (ITO)-coated glass substrates by electrostatic self-assembly. The UV–visible absorption spectroscopy showed that the films were uniformly deposited with the visible absorption bands for H in the films exhibiting different extents of bathochromic shifts with respect to H aqueous solution. The (P W M /H ) films exhibited cathodic photocurrents as irradiated with white light. The photocurrent action spectra were found to match with the absorption spectra of the films, indicating that the cathodic photocurrents were generated based on intramolecular charge transfer excitation of the H in the films. The photocurrents were found to strongly depend on the transition metal ions M in (P W M /H ) films. The effects of applied bias voltages, electron acceptor added in the electrolyte, and layer numbers of the films on photocurrent generation of (P W M /H ) films were also examined, and photoelectric mechanism discussed.
    Keywords: Polyoxometalate ; Hemicyanine ; Self-Assembled Film ; Photoelectrochemical Property ; Engineering ; Chemistry
    ISSN: 0021-9797
    E-ISSN: 1095-7103
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  • 5
    Language: English
    In: Journal of Applied Polymer Science, Feb, 2014, Vol.131(4), p.n/a(8)
    Description: Byline: Xiaoyan Lin, Lihua Gao, Xi Chen, Jianmin Qi, Kezhi Wang Keywords: films; optical and photovoltaic applications; optical properties ABSTRACT In this article, we report on electrostatically self-assembled thin films prepared by the alternative immersion of quartz-coated and indium tin oxide coated glass substrates in aqueous solutions of a copolymer of poly(4-styrenesulfonic acid-co-maleic acid) (PSSMA) and a hemicyanine of (E)-1,1a[sup.2]-(propane-1,3-diyl)bis{4-[4-(dimethylamino)styryl]pyridinium} bromide (H.sub.3Br.sub.2). The films were studied by means of ultraviolet-visible absorption and X-ray photoelectron spectroscopies, scanning electron microscopy, and photoelectrochemical measurements. When irradiated with white light, the PSSMA/H.sub.3 monolayer film gave a stable cathodic photocurrent. The effects of the applied bias voltages, layer numbers of the (PSSMA/H.sub.3).sub.n films (where n stands for the number of bilayer films on both sides of the substrates), light intensities, pH value, and electron acceptor on the photocurrent generation of the (PSSMA/H.sub.3).sub.n film were examined. [c] 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39871. Supporting information: Additional Supporting Information may be found in the online version of this article Additional Supporting Information may be found in the online version of this article. CAPTION(S): Supporting Information
    Keywords: Biphenyl (Compound) -- Optical Properties ; Thin Films -- Optical Properties ; Bromine Compounds -- Optical Properties ; Copolymers -- Optical Properties
    ISSN: 0021-8995
    E-ISSN: 10974628
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  • 6
    Language: English
    In: Applied Surface Science, Jan 1, 2013, Vol.264, p.133(6)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.apsusc.2012.09.140 Byline: Jun He (a), Lin Sun (a), Kezhi Zhang (a), Weijun Wang (a), Jinchun Jiang (b), Ye Chen (a), Pingxiong Yang (a), Junhao Chu (a)(b) Keywords: Cu.sub.2ZnSnS.sub.4 thin films; Sputtering; Post-sulfurization; Composition; Structure; Optical properties Abstract: a* CZTS films were deposited directly from a CZTS target by sputtering process. a* The internal compressive stress relaxes in post-annealed CZTS films. a* The band gaps of post-annealed CZTS films are smaller than those of as-deposited. Author Affiliation: (a) Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai 200241, China (b) Shanghai Center for Photovoltaics, Shanghai 201201, China Article History: Received 7 August 2012; Revised 25 September 2012; Accepted 26 September 2012
    Keywords: Thin Films -- Optical Properties ; Thin Films -- Analysis
    ISSN: 0169-4332
    Source: Cengage Learning, Inc.
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  • 7
    In: Journal of Applied Polymer Science, 15 February 2014, Vol.131(4), pp.n/a-n/a
    Description: In this article, we report on electrostatically self‐assembled thin films prepared by the alternative immersion of quartz‐coated and indium tin oxide coated glass substrates in aqueous solutions of a copolymer of poly(4‐styrenesulfonic acid‐‐maleic acid) (PSSMA) and a hemicyanine of ()−1,1′‐(propane‐1,3‐diyl)bis{4‐[4‐(dimethylamino)styryl]pyridinium} bromide (HBr). The films were studied by means of ultraviolet–visible absorption and X‐ray photoelectron spectroscopies, scanning electron microscopy, and photoelectrochemical measurements. When irradiated with white light, the PSSMA/H monolayer film gave a stable cathodic photocurrent. The effects of the applied bias voltages, layer numbers of the (PSSMA/H) films (where stands for the number of bilayer films on both sides of the substrates), light intensities, pH value, and electron acceptor on the photocurrent generation of the (PSSMA/H) film were examined. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. , , 39871.
    Keywords: Films ; Optical And Photovoltaic Applications ; Optical Properties
    ISSN: 0021-8995
    E-ISSN: 1097-4628
    Source: John Wiley & Sons, Inc.
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  • 8
    Language: English
    In: Journal of Materials Science, 2015, Vol.50(24), pp.8064-8072
    Description: A series of electrostatically self-assembled films have successfully been prepared by alternating adsorption of transition element-monosubstituted tungstoborate anions [BW 11 M(H 2 O)O 39 ] 7− (BW 11 M, M = Ni, Cu, Cd) and a bichromophore hemicyanine cation of ( E )-1,1′-(hexane-1,6-diyl)bis(4-(4-(dimethylamino)styryl)pyridinium) (H 6 ), respectively. The UV–Visible spectra showed that the films were uniformly deposited and H 6 molecules formed J -aggregations in the films. The (BW 11 M/H 6 ) n films could generate stable cathodic photocurrents of 0.56–1.32 μA/cm 2 as irradiated with white light (100 mW/cm 2 , 730 nm 〉  λ  〉 325 nm) at zero bias voltage versus SCE, and the photocurrent action spectra indicated that the cathodic photocurrents were generated based on charge transfer excitation of the H 6 in the (BW 11 M/ H 6 ) n films. The composition and structure of polyoxometalate anion in the films have important influences on photocurrents. Moreover, the effects of layer number of (BW 11 M/H 6 ) n film, applied potentials, and electron acceptor in the electrolyte on photocurrent generation of the (BW 11 M/H 6 ) n films have been examined, and photoelectric mechanism is also discussed
    Keywords: Anions ; Copper ; Cadmium ; Nickel ; Electrolytes ; Adsorption ; Nanocomposites ; White Light;
    ISSN: 0022-2461
    E-ISSN: 1573-4803
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  • 9
    Language: English
    In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, 05 March 2016, Vol.492, pp.119-126
    Description: A electrostatic thin film of an europium-substituted tungstoborate anion with a dinuclear ruthenium(II) complex cation is prepared layer-by-layer as evidenced by ultraviolet–visible absorption spectroscopy. The surface confined good redox behaviors of the cation and anion in the films were observed. The films showed stable and large cathodic photocurrent with a maximum photocurrent density of 2.66 μA cm was achieved for 4 layer film at an applied potential of −0.3 V versus SCE, which is 2.28 folds as great as that of similar film with an inert polymer layer instead of the anion layer. A new electrostatically self-assembled hybrid film consisting of alternating layers of europium-substituted tungstoborate anion of [Eu(BW O ) ] (EuBW) and dinuclear ruthenium(II) polypyridyl complex cation of [(bpy) Ru(BPBH)Ru(bpy) ] {in which bpy = 2,2′-bipyridine and BPBH = 1,6-bis-(2-(2-phenyl)benzimidazoyl)hexane, RuBPBH} was successfully prepared. UV–vis absorption spectroscopy provided the evidences for the layer-by-layer deposition of EuBW anion and RuBPBH cation on quartz substrate. The (EuBW/RuBPBH) films showed stable electrochemical and photoelectrochemical properties with a photocurrent density of 2.66 μA/cm being found for a 4-layer film of (EuBW/RuBPBH) , while irradiated with polychromatic light (325 nm 〈 〈 730 nm) at an applied potential of −0.3 V versus saturated calomel electrode. The enhanced photocurrent generation by presence of the EuBW layer in this hybrid film has also been demonstrated as compared to the (PSS- -MS/RuBPBH) film by using a photoelectrochemical inactive polyanion of PSS- -MS instead of the EuBW anion.
    Keywords: Thin Film ; Ruthenium ; Polyoxometalate ; Photoelectrochemical Property ; Engineering ; Chemistry
    ISSN: 0927-7757
    E-ISSN: 1873-4359
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  • 10
    Language: English
    In: Materials Science & Engineering A, Dec 15, 2011, Vol.530, p.57(6)
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.msea.2011.09.038 Byline: Hailiang Li (a), Hejun Li (a), Jinhua Lu (a), Can Sun (a), Yongjie Wang (a), Dongjia Yao (a), Kezhi Li (a), Haipeng Wang (b) Keywords: Light microscopy; Mechanical characterization; Composites; Fracture Abstract: Display Omitted Author Affiliation: (a) State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi' an, 710072, PR China (b) Department of Applied Physics, Northwestern Polytechnical University, Xi' an, 710072, PR China Article History: Received 17 May 2011; Accepted 8 September 2011
    Keywords: Composite Materials Industry
    ISSN: 0921-5093
    Source: Cengage Learning, Inc.
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