Daosen Jin

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (9)22.04 Total impact

  • Yufang Xiao, Zhongqi Yao, Daosen Jin
    The Journal of Physical Chemistry 04/2002; 97(32). · 2.78 Impact Factor
  • Yufang Xiao, Zhongqi Yao, Daosen Jin
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    ABSTRACT: A tetrathiafulvalene derivative — tetrabenzylthiotetrathiafulvalene (TBT-TTF) — is a new material for a conducting Langmuir-Blodgett film. A 1:1 molar mixture with stearic acid was built up to obtain a conducting LB film. The conductivities of this mixed LB film were calculated from experimental results before and after iodine oxidation. To understand the increase in conductivity after iodine oxidation, the IR electronic absorption spectra and X-ray diffraction were investigated. The IR results suggest that the system undergoes continuous free chemical reactions after iodine oxidation. TBT-TTF forms the radical cation dimers associated with I3−. Finally, interaction of this new charge transfer complex (TBT-TTF)x(I3−)1−x (x < 1), gives rise to a new conducting LB film with the highest conductivity (4.7 × 10−2 S cm−1). However, the conducting phase is unstable. The LB film can be oxidized repeatedly by iodine vapour. This is a possible application for gas sensors. The result of X-ray diffraction demonstrates that the molecular reorganization occurs because of tri-iodine chains in the bilayer.
    Thin Solid Films 09/1994; 249(2):210-214. · 1.87 Impact Factor
  • Yufang Xiao, Zhongqi Yao, Daosen Jin
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    ABSTRACT: A new TTF derivative tetrakis(hexadecylthio)-tetrathiafulvalene (THT-TTF) as a Langmuir-Blodgett film material is synthesized. The molecular behavior at the air-water interface is studied by admixture different molar numbers of stearic acid (SA) and a possible molecular reorganization is discussed according to the occupied area per THT-TTF molecule at different SA molar numbers. THT-TTF molecules form dimers, monolayer and intermediate. The ultraviolet (UV) spectra prove this point quantitatively. After iodine oxidation, THT-TTF is not oxidized completely to the cation radical THT-TTF+ from Raman spectra. The formation of triiodide chains has been proved by Raman spectra and UV absorption spectra. Intercalation of the triiodide chain in the bilayers induces the alkyl chains rearrangement and a large reduction in layer thickness. The investigation of conductivities shows that the conductivities are proportional to the THT-TTF molar fraction and that there is a small percolation threshold at Φ∗ = 0.50, which means that THT-TTF is a 2D molecular system. The maximum conductivity reaches 0.9 S cm−1.
    Thin Solid Films 08/1994; 248(1):118–125. · 1.87 Impact Factor
  • Yufang Xiao, Zhongqi Yao, Daosen Jin
    Langmuir 06/1994; 10(6):1848-1850. · 4.38 Impact Factor
  • Yufang Xiao, Zhongqi Yao, Daosen Jin
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    ABSTRACT: In this paper, the pure C[sub 60] Langmuir-Blodgett (LB) film was built up successfully at a surface pressure of 0 and 25 mN/m. High-resolution electron microscopy and electron diffraction were used to examine the LB film. When surface pressure is 25 mN/m, the electron diffraction pattern of pure C[sub 60] LB film appears highly-symmetric in six spots. According to the calculated results, the C[sub 60] crystallites in the LB film are [r angle]111[l angle] zone of fcc structure with a[sub 0] = 14.14 [angstrom]. 10 refs., 5 figs., 1 tab.
    The Journal of Physical Chemistry 05/1994; 98:21. · 2.78 Impact Factor
  • Yufang Xiao, Zhongqi Yao, Daosen Jin
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    ABSTRACT: A conducting Langmuir-Blodgett (LB) film of tetrabenzylthiotetrathiafulvalene-Ni(dmit)2 (TBT-TTF-Ni(dmit)2, where H2dmit is 4,5-dimercapto-1,3-dithiol-2-thione) with stearic acid (SA) was fabricated. The monolayer of (TBT-TTF-Ni(dmit)2)-SA at the air-water interface was studied. The thickness per layer obtained from X-ray diffraction was 2.29 nm. The conductivity of mixed LB films was measured without or with iodine oxidation. Anisotropy of conductivity was observed in the film. After iodine oxidation, with a 0.1 molar fraction of SA the maximum conductivity perpendicular to LB film was 10-2 S cm-1 and parallel to LB film was 40 S cm-1.
    Thin Solid Films 09/1993; 232(2):261-264. · 1.87 Impact Factor
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    ABSTRACT: In this work, a mixed Langmuir-Blodgett (LB) film was built up using C[sub 60] mixed with arachidic acid (AA) and investigated by FT-IR, UV, Raman, and ESR spectroscopies without or with iodine vapor doping at 60[degrees]C for 18-42 h. The positions of peaks in IR and Raman spectra did not change before and after iodine doping. But the positions of electronic absorption in the UV spectra were shifted by ca. 2-4 nm and six hyperfine splitting lines appeared in ESR signals after iodine doping. According to the experimental results, two possible mechanisms for the interaction of C[sub 60] with I[sub 2] were proposed. 28 refs., 5 figs.
    The Journal of Physical Chemistry 07/1993; 97(27):7072-7074. · 2.78 Impact Factor
  • Yufang Xiao, Zhongqi Yao, Daosen Jin
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    ABSTRACT: Conductive Langmuir-Blodgett (LB) films were fabricated with a mixture of semiamphiphilic charge transfer complex tetrabenzylthiotetrathiafulvalene-tetracyanoquinodimethane (TBTTTF-TCNQ) with stearic acid (SA). The monolayer of (TBTTTF-TCNQ)-SA at the air-water interface was studied, and the collapse pressure increased with an increase in the molar fraction of SA. The thickness per layer obtained from the results of X-ray diffraction is 2.22 nm. The conductivities of mixed LB films are measured without iodine doping and with iodine doping; the SA content has an effect on the conductivities of mixed LB films. Anisotropy of conductivity was observed in the film. The maximum conductivity of the mixed LB film is 10−2 S cm−1 with a 0.1 molar fraction of SA.
    Thin Solid Films 03/1993; 224(2):237-241. · 1.87 Impact Factor
  • Yufang Xiao, Zhongqi Yao, Daosen Jin
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    ABSTRACT: A conducting Langmuir-Blodgett (LB) film containing a charge transfer complex, tetrabenzylthiotetrathiafulvalene-Zn (dmit)2 (TBTTTF-Zn(dmit)2), where H2(dmit) is 4,5-dimercapto-1,3-dithiol-2-thione, is described. Monolayers at the air-water interface were formed by adding stearic acid (SA) to the semiamphiphilic complex. This was transferred onto solid substrates with SA for IR, UV and conductivity measurements. The thickness per layer was 2.51 nm. The LB films were oxidized with iodine. The maximum conductivities parallel and perpendicular to the LB film were 4.3×10−1 S cm−1 and 10−3 S cm−1 respectively. The LB film exhibited anisotropy of conductivity..
    Thin Solid Films 01/1993; 223(1):173–177. · 1.87 Impact Factor

Publication Stats

44 Citations
22.04 Total Impact Points

Institutions

  • 1993–1994
    • Chinese Academy of Sciences
      • Lanzhou Institute of Chemical Physics
      Peping, Beijing, China