2024-03-29T12:00:45Zhttps://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/307892022-07-06T21:15:19Zcom_10324_1186com_10324_931com_10324_894col_10324_1404
00925njm 22002777a 4500
dc
Rodríguez Méndez, María Luz
author
Apetrei, Constantin
author
Nieto, M.
author
Hernandez, V.
author
López Navarrete, J.T.
author
Effenberger, F.
author
Saja Sáez, José Antonio de
author
2009
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–T2–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–T2–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.
Sensors and Actuators B vol. 141 p. 625-633
0925-4005
http://uvadoc.uva.es/handle/10324/30789
https://doi.org/10.1016/j.snb.2009.06.018
Sensing Properties of organised films based on a bithiophene derivative