RT info:eu-repo/semantics/article
T1 Sensing Properties of organised films based on a bithiophene derivative
A1 Rodríguez Méndez, María Luz
A1 Apetrei, Constantin
A1 Nieto, M.
A1 Hernandez, V.
A1 López Navarrete, J.T.
A1 Effenberger, F.
A1 Saja Sáez, José Antonio de
AB 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.
SN 0925-4005
YR 2009
FD 2009
LK http://uvadoc.uva.es/handle/10324/30789
UL http://uvadoc.uva.es/handle/10324/30789
LA eng
NO Sensors and Actuators B  vol. 141 p. 625-633
NO Producción Científica
DS UVaDOC
RD 24-nov-2024