Synthesis, Characterization and Photoelectric Properties of the Copper Phthalocyanine-modied Multi-walled Carbon Nanotubes
- 化学化工－已发表论文 
[中文文摘]采用氯磺酸作为磺化试剂,在多壁碳纳米管上接枝氯磺酰基,之后通过乙二胺的胺解反应,制备出胺基修饰的多壁碳纳米管MWCNT-NH2,并进一步与氯磺酰基酞菁铜反应制备出MWCNT-Pc复合物.产物采用红外光谱,紫外可见,拉曼光谱,X射线光电子能谱,循环伏安,热重分析等进行了表征.结果表明,MWCNT-NH2上磺酰胺基接枝在MWCNT表面,而MWCNT-Pc上的酞菁基团是通过MWCNT-NH2上的酰胺基团与Pc形成复合物,碳纳米管上约38个碳原子结合一个磺酸基酞菁分子;该MWCNT-Pc复合物的热稳定性较MWCNT-NH2低;利用喷涂法构筑了ITO/MWCNT-Pc光电极,光电性能的研究结果表明在AM1.5光照条件下,光电压及光电流分别为0.434V和0.158mA/cm2;在320nm处的IPCE达19.8%,具有较优良的光电转化性能.根据测得的MWCNT-Pc的能带结构,推知MWCNT-Pc的光诱导电子转移过程是Pc端基发生光激发电子跃迁,此后电子转移到MWCNTs上并进一步传递到ITO,完成电荷分离.[英文文摘]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.