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

doi:10.3724/SP.J.1077.2011.00785

Abstract

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.

Key words: multi-walled carbon nanotubes, copper phthalocyanine, photoelectric property

CLC Number:

O614

WU Zhen-Yi, YANG Sheng-Yan. Synthesis, Characterization and Photoelectric Properties of the Copper Phthalocyanine-modied Multi-walled Carbon Nanotubes[J]. Journal of Inorganic Materials, 2011, 26(8): 785-791.

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