Tailoring Molecular Architectures with Cobalt Tetrasulfonated Phthalocyanine: Immobilization in Layer-by-Layer Films and Sensing Applications

被引:20
作者
Centurion, L. M. P. C. [1 ]
Moreira, W. C. [2 ]
Zucolotto, V. [1 ]
机构
[1] Univ Sao Paulo, IFSC, Nanomed & Nanotoxicol Lab, BR-13560970 Sao Carlos, SP, Brazil
[2] Univ Fed Sao Carlos, DQ, BR-13565905 Sao Carlos, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
Metallophthalocyanines; Self-Assembly; Sensors; Electrical Measurements; THIN-FILMS; MULTILAYER FILMS; SENSORS; METALLOPHTHALOCYANINES; DEPOSITION; DENDRIMERS;
D O I
10.1166/jnn.2012.5782
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In the field of organic thin films, manipulation at the nanoscale can be obtained by immobilization of different materials on platforms designed to enhance a specific property via the layer-by-layer technique. In this paper we describe the fabrication of nanostructured films containing cobalt tetrasulfonated phthalocyanine (CoTsPc) obtained through the layer-by-layer architecture and assembled with linear poly(allylamine hydrochloride) (PAH) and poly(amidoamine) dendrimer (PAMAM) polyelectrolytes. Film growth was monitored by UV-vis spectroscopy following the Q band of CoTsPc and revealed a linear growth for both systems. Fourier transform infrared (FTIR) spectroscopy showed that the driving force keeping the structure of the films was achieved upon interactions of CoTsPc sulfonic groups with protonated amine groups present in the positive polyelectrolyte. A comprehensive SPR investigation on film growth reproduced the deposition process dynamically and provided an estimation of the thicknesses of the layers. Both FTIR and SPR techniques suggested a preferential orientation of the Pc ring parallel to the substrate. The electrical conductivity of the PAH films deposited on interdigitated electrodes was found to be very sensitive to water vapor. These results point to the development of a phthalocyanine-based humidity sensor obtained from a simple thin film deposition technique, whose ability to tailor molecular organization was crucial to achieve high sensitivity.
引用
收藏
页码:2399 / 2405
页数:7
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