期刊论文详细信息
SENSORS AND ACTUATORS B-CHEMICAL 卷:141
Sensing properties of organised films based on a bithiophene derivative
Article
Rodriguez-Mendez, M. L.1,6  Apetrei, C.2  Nieto, M.1  Hernandez, V.3  Lopez Navarrete, J. T.3  Effenberger, F.4  de Saja, J. A.5,6 
[1] Univ Valladolid, ETS Ingenieros Ind, Dptm Quim Inorgan, E-47011 Valladolid, Spain
[2] Dunarea de Jos Univ Galati, Fac Sci, Dpt Chem, Galati, Romania
[3] Univ Malaga, Dptm Quim Fis, E-29071 Malaga, Spain
[4] Univ Stuttgart, Inst Organ Chem, D-7000 Stuttgart, Germany
[5] Univ Valladolid, Fac Sci, Dptm Condensed Matter Phys, E-47011 Valladolid, Spain
[6] Inst Estruct Mat CSIC, UVA, Unidad Asociada FMC, Madrid, Spain
关键词: Bithiophene;    Langmuir-Blodgett;    Sensor;    Electrochromism;   
DOI  :  10.1016/j.snb.2009.06.018
来源: Elsevier
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【 摘 要 】

Highly reproducible optic and electrochemical sensors have been developed using organised films from a polar bithiophene derivative, the 5-(dimethylamino)-5'-nitro-2,2'-bithiophene (Me2N-T-2-NO2). The strength of the molecular dipole moment of this push-pull end-capped bithiophene has permitted to obtain highly ordered, homogeneous and reproducible films by using both the Langmuir-Blodgett and the casting techniques. The organisation of the molecules in LB films and cast films has been established by means of UV-vis, infrared and Raman spectroscopy and by AFM. Me2N-T-2-NO2 thin films possess appealing optical and electrochemical sensing capabilities. UV-vis spectra can be modified in the presence of a variety of volatile organic compounds and the sensitivity is related to the polarity of the gas analysed. Films can also be used as electrochemical sensors because the characteristics of the current/potential curves are sensitive to the nature of the electrolytic solution. The spectral changes accompanying the applied voltage could be used to produce ionochromic sensor electrodes. The structure of the films has an important impact in the sensing properties of the films and in their stability. The optical and electrochemical sensing properties of Langmuir-Blodgett films are more reproducible than those observed in cast films. This makes films prepared using the LB technique to be preferred as sensing devices. However the casting technique provides a fast method to obtain cheap and highly ordered sensors. (C) 2009 Elsevier B.V. All rights reserved.

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