Electrophoretic Deposition of Single-Walled Carbon Nanotubes Covalently Modified with Bulky Porphyrins on Nanostructured SnO2 Electrodes for Photoelectrochemical Devices
Electrophoretic Deposition of Single-Walled Carbon Nanotubes Covalently Modified with Bulky Porphyrins on Nanostructured SnO2 Electrodes for Photoelectrochemical Devices
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DOI：
10.1021/jp072075w
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发表时间：
2007-07
影响因子：
3.7
通讯作者：
T. Umeyama;M. Fujita;Noriyasu Tezuka;Naoki Kadota;Y. Matano;Kaname Yoshida;S. Isoda;H. Imahori
中科院分区：
文献类型：
--
作者：
T. Umeyama;M. Fujita;Noriyasu Tezuka;Naoki Kadota;Y. Matano;Kaname Yoshida;S. Isoda;H. Imahori
制备了单壁碳纳米管（SWNTs）与大卟啉分子的共价修饰，并将其与SnO 2纳米结构电极组装成光电化学器件。卟啉连接的单壁碳纳米管的纳米结构的SnO 2电极上的膜表现出的入射光-光电流效率高达4.9%，在0.08 V vs SCE的施加电位下。在卟啉连接的单壁碳纳米管装置中更均匀的膜和适度的光电流产生可以通过在单壁碳纳米管周围产生大的空间位阻的大体积卟啉的剥离能力来合理化。从单壁碳纳米管的激发态到SnO 2电极的导带的直接电子注入负责光电流的产生。尽管卟啉连接的单壁碳纳米管对卟啉的激发单重态有很好的猝灭作用，但光电流作用谱表明，卟啉连接的单壁碳纳米管对卟啉的激发单重态有很好的猝灭作用。
Single-walled carbon nanotubes (SWNTs) covalently modified with large porphyrin molecules have been prepared to construct photoelectrochemical devices with nanostructured SnO2 electrodes on which the multiporphyrin-linked SWNTs are deposited electrophoretically. The film of the porphyrin-linked SWNTs on the nanostructured SnO2 electrode exhibited an incident photon-to-photocurrent efficiency as high as 4.9% under an applied potential of 0.08 V vs SCE. The more uniform film and moderate photocurrent generation in the porphyrin-linked SWNT devices can be rationalized by the exfoliation abilities of the bulky porphyrins that yield large steric hindrance around the SWNTs. Direct electron injection from the excited states of the SWNTs to the conduction band of the SnO2 electrode is responsible for the photocurrent generation. Despite the efficient quenching of the porphyrin-excited singlet state by the SWNTs in the porphyrin-linked SWNTs, the photocurrent action spectra revealed that the excitation of the porp...