Zirconium Phosphonate Multilayers of Organic Redox Couples on Nanocrystalline TiO2Semiconductor Electrode
作者:
MyungSoon Lee,
HyunKwan Shim,
YeongIl Kim,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 316,
issue 1
页码: 401-406
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808044537
出版商: Taylor & Francis Group
关键词: metal phosphonate multiplayer;nanocrystalline TiO2;viologen derivative;perylenebis(dicarboximide) derivative
数据来源: Taylor
摘要:
New type of surface modification of redox-couple multilayers on nanoporous TiO2film has been demonstrated. N,N′-bis(ethylphosphonic acid)-4,4′-bipyridinium chloride(VP) and N,N′-bis(ethyl dihydrogen phosphate)-3,4,9,10-perylene bis(dicarboximide)(EPPI) were directly coordinated at surface defect site Ti4+of nanoporous TiO2film electrode. The sequential adsorption by alternating treatment of ZrOCl2and VP or EPPI allows building up zirconium phosphonate multilayers of the redox couples. Cyclic voltammetry and UV-visible absorption measurement have shown the systematic layer-by-layer growing of the multilayers and the heterogeneous electron-transfer from TiO2conduction band to the redox couples multilayers. The estimated average amount of the redox couples in each layer on the electrode was about 1.0 × 10−11mole/cm2which is in agreement with the reported density of states assigned to surface Ti4+sites.
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