Solution-processed thin films based on sandwich-type mixed (phthalocyaninato)(porphyrinato) europium triple-deckers: Structures and comparative performances in ammonia sensing
- 作者：Jian Gaoa ; [Author Vitae] ; Guifen Luc ; [Author Vitae] ; Jinglan kana ; d ; [Author Vitae] ; Yanli Chena ; chm_chenyl@ujn.edu.cn ; [Author Vitae] ; Marcel Bouvetb ; ; [Author Vitae]
- 关键词：Phthalocyanine ; Porphyrin ; Rare earth triple-decker complex ; Solution-processed thin films ; Structure ; Ammonia sensing
- 刊名：Sensors and Actuators B ; Chemical
- 出版年：2012
- 期刊代码：161_09254005
- 类别：et
- 出版时间：20 May, 2012
- 卷：166-167
- 期：Complete
- 页码：500-507
- 文件大小：1186 K
摘要
The solution-processed thin films of a series of three sandwich-type mixed (phthalocyaninato)(porphyrinato) europium complexes with different numbers of hydroxyl groups at the meso-substituted phenyl groups of porphyrin ligand 1-3 were prepared by a quasi-Langmuir-Sh盲fer (QLS) method. Examination by spectroscopic methods revealed that J-type aggregates have been formed with the increasing degree of order of molecular stacking 1 < 2 < 3 films. The IR and XRD results reveal that, a dimeric supramolecular structure was formed depending mainly on the 蟺-蟺 interaction between the tetrapyrrole cores of neighboring triple-decker molecules, which, as the building blocks, self-assembled into the target nanostructures through intermolecular hydrogen bonds. Competition and cooperation between the intermolecular 蟺-蟺 interaction and hydrogen bonding for different compounds were revealed to result in thin-film microstructure with a different morphology from nano-grains for 1 and 2 and nano-sheets for 3. An increasing sensitivity to NH3 at varied concentrations in the range of 15-800 ppm, follows the order 3 < 1 < 2, revealing the effect of film structure/morphology on sensing performance. In particular, excellent sensitivity, nearly complete reversibility and reproducibility to NH3 even at room temperature are obtained for the ultra-thin solution processed films from 2.