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Synthesis, Characterization and Photoelectric Properties of the Copper Phthalocyanine―modied Multi―walled Carbon Nanotubes

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Author(s): WU Zhen-Yi, YANG Sheng-Yan

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 8;
Start page: 785;
Date: 2011;
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Keywords: multi-walled carbon nanotubes; copper phthalocyanine; photoelectric property

ABSTRACT
Multi―walled carbon nanotubes (MWCNTs) were grafted with sulfonyl chloride groups using chlorosulfonic acid as a sulfonation reagent, and then the amino―modified multi―walled carbon nanotubes of MWCNT―NH2 was prepared via the aminolysis reaction. The MWCNT―NH2 was further reacted with copper phthalocyanine sulfonyl chloride to prepared the complex of MWCNT―Pc. The products were fully characterized by various standard analytical techniques, including scanning electron microscope, transmission electron microscope, infrared spectroscope, UV―Vis absorption spectroscope, Raman spectroscope, X―ray photoelectron spectroscope, thermogravimetric analysis, and cyclic voltammetry. The results indicated that the complex of MWCNT―Pc was fabricated through covalent assembly of MWCNT―NH2 with copper phthalocyanine, with a copper phthalocyanine molecule for every 38 MWCNT carbons.The thermal stability of the complex of MWCNT―Pc was lower than that of MWCNT―NH2.The photoelectrode of ITO/MWCNT―Pc fabricated by the method of the spray showed a better photoelectric performance with the photovoltage and the photocurrent were 0.434V and 0.158mA/cm2 respectively, and the internal photoconversion efficiency at 320nm was up to 19.8%. Based on the band structure of the complex of MWCNT―Pc, the photoinduced electron transfer process was proposed as follow: firstly the electronic transitions occured in the Pc moiety of MWCNT―Pc, following electrons transferred to MWCNTs and then further passed to the ITO to achieve the charge separation.
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