CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Optical properties of conjugated polymer-ZnSe nanocrystal nanocomposites |
Yun Da-Qin(云大钦)a), Feng Wei(封伟)b)†, Wu Hong-Cai(吴洪才)a), Liu Xiao-Zeng (刘效增)a), and Qiang Jun-Feng(强军锋)a) |
a School of Electrical and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China; b School of Materials Science and Engineering, Tianjin University, 300072, China and Tianjin Key; Laboratory of Composite and Functional Materials, Tianjin 300072, China |
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Abstract Nanocomposites of poly[(2-methoxy,5-octoxy)1,4-phenylenevinylene]-zinc selenide (MOPPV-ZnSe) are synthesized by mixing the polymerization of 1,4-bis (chloromethyl)-2-methoxy-5-octoxy-benzene in the presence of ZnSe quantum dots. The resulting MOPPV-ZnSe nanocomposites possess a well-defined interfacial contact, thus significantly promoting the dispersion of ZnSe within the MOPPV matrix and facilitating the electronic interaction between these two components. Raman and UV--visible absorption spectra are influenced by the incorporation of ZnSe nanocrystals. High-resolution transmission electron microscopic and tapping-mode atomic force microscopic results show clearly the evidence for phase-segregated networks of ZnSe nanocrystals, which provide a large area of interface for charge separation to occur. Steady-state spectra of MOPPV-ZnSe nanocomposites are markedly quenched by the introduction of intimate polymer/ZnSe junctions. Time-resolved photoluminescence measurements show that the lifetime decays quickly, which further confirms the occurrence of charge transfer in MOPPV-ZnSe nanocomposites.
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Received: 15 July 2009
Revised: 04 August 2009
Accepted manuscript online:
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PACS:
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78.67.Bf
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(Nanocrystals, nanoparticles, and nanoclusters)
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78.30.-j
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(Infrared and Raman spectra)
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78.40.-q
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(Absorption and reflection spectra: visible and ultraviolet)
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81.07.Bc
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(Nanocrystalline materials)
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81.16.-c
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(Methods of micro- and nanofabrication and processing)
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82.35.Cd
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(Conducting polymers)
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Fund: Project supported by the National
Natural Science Foundation of China (Grant No. 50873074), Program
for New Century Excellent Talents in University of Chinese Education
Ministry (Grant No. 060232), Foundation for Key Program of Ministry
of Education, China (Grant No. 108029) and Scientific Research
Foundation of Xi'an Jiaotong University, China (Grant No. 011092). |
Cite this article:
Yun Da-Qin(云大钦), Feng Wei(封伟), Wu Hong-Cai(吴洪才), Liu Xiao-Zeng (刘效增), and Qiang Jun-Feng(强军锋) Optical properties of conjugated polymer-ZnSe nanocrystal nanocomposites 2010 Chin. Phys. B 19 017304
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