Optical properties of conjugated polymer-ZnSe nanocrystal nanocomposites

doi:10.1088/1674-1056/19/1/017304

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.

Keywords: nanocomposites interface time-resolved photoluminescence spectrum excitons separation

Received: 15 July 2009
Revised: 04 August 2009
Accepted manuscript online:

PACS:	78.67.Bf	(Nanocrystals, nanoparticles, and nanoclusters)
	78.30.-j	(Infrared and Raman spectra)
	78.40.-q	(Absorption and reflection spectra: visible and ultraviolet)
	81.07.Bc	(Nanocrystalline materials)
	81.16.-c	(Methods of micro- and nanofabrication and processing)
	82.35.Cd	(Conducting polymers)

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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Optical properties of conjugated polymer-ZnSe nanocrystal nanocomposites

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