A photoelectrochemical device with a nanostructured SnO2 electrode modified with composite clusters of porphyrin-modified silica nanoparticle and fullerene
A photoelectrochemical device with a nanostructured SnO2 electrode modified with composite clusters of porphyrin-modified silica nanoparticle and fullerene
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DOI：
10.1021/jp061524
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发表时间：
2006-06-15
影响因子：
3.3
通讯作者：
Ito, Osamu
中科院分区：
文献类型：
--
作者：
Imahori, Hiroshi;Mitamura, Keigo;Ito, Osamu
二氧化硅纳米颗粒已经成功地作为纳米支架在纳米结构的SnO2电极上自组装了卟啉和C-60分子。二氧化硅纳米颗粒上的卟啉激发单重态的猝灭被显著抑制，这表明二氧化硅纳米颗粒是在纳米尺度上三维组织光活性分子的有前途的支架。与用金核代替二氧化硅纳米颗粒作为卟啉支架的参比系统相比，本系统的光电流产生得到了显著的增强。与使用二氧化硅微粒的类似光电化学器件相比，较小的入射光子电流效率可能是由于复合薄膜中较差的电子和空穴迁移率造成的，这是因为卟啉修饰的二氧化硅纳米颗粒与微米级的C-60的复合团簇之间的连接较差。
A silica nanoparticle has been successfully employed as a nanoscaffold to self-organize porphyrin and C-60 molecules on a nanostructured SnO2 electrode. The quenching of the porphyrin excited singlet state on the silica nanoparticle is suppressed significantly, showing that silica nanoparticles are promising scaffolds for organizing photoactive molecules three-dimensionally in nanometer scale. Marked enhancement of the photocurrent generation was achieved in the present system compared with the reference system, where a gold core was employed as a scaffold of porphyrins instead of a silica nanoparticle. The rather small incident photon-to-current efficiency relative to a similar photoelectrochemical device using a silica microparticle may result from poor electron and hole mobility in the composite film due to poor connection between the composite clusters of a porphyrin-modified silica nanoparticle and C-60 in micrometer scale.