期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 70, 期 5, 页码 966-972出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2007.10.012
关键词
nanocomposite; CdTe attached onto poly(amidoamine) modified multi-walled carbon nanotubes; properties of spectra of nanocomposites; fluorescence quenching energy transfer/clectron transfer
类别
资金
- National Natural Science Foundation [20435010, 20205005, 20375012]
- Hunan Provincial Natural Science Foundation [04JJ30047]
A novel nanocomposite of CdTe-PAMAM-MWNT was synthesized by covalently linking CdTe quantum dots (QDs) onto highly water-soluble multi-wall carbon nanotubes (MWNTs) functionalized with dendritic poly(amidoamine) (PAMAM). The IR, UV-vis and TEM methods has been used for the characterization of the composites. A facile method for controlling the density of QDs in the composite by simply changing the ratio of CdTe QDs/PAMAM-MWNT, as was verified by the TEM images. The experiments revealed that PAMAM and PAMAM-MWNT, once covalently linked with CdTe QDs, had remarkable effect on their fluorescence property. The fluorescence intensity of the CdTe-PAMAM hybrid was substantially enhanced as a compared to that of QDs, and the fluorescence was quenched greatly when QDs reacted with PAMAM-MWNT. The experimentally observed phenomena indicate that electron and energy transfer took place efficiently between CdTe QDs, PAMAM and MWNTs in the novel composite. These nanocomposits might hold great potential in photoelectron device and biotechnology applications. (C) 2007 Elsevier B.V. All rights reserved.
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