期刊
ANALYTICA CHIMICA ACTA
卷 434, 期 2, 页码 231-237出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0003-2670(01)00835-2
关键词
surface plasmon resonance; volatile organic compounds; nematic liquid crystals; phase transition; threshold sensing
Homogeneously aligned nematic liquid crystals have been tested for the sensing of volatile organic compounds using surface plasmon resonance (SPR). Oriented nematic liquid crystals are birefringent materials. A loss of birefringence of these nematic liquid crystals can be achieved by raising the temperature or by sorption of analyte. At a certain temperature, the so-called clearing point, or at a certain analyte concentration, a phase transition from the nematic to the isotropic state takes place, and the birefringence of the liquid crystal is completely lost. Within this transition, the sensor signal becomes extremely sensitive to small changes in analyte's concentration. Therefore the set-up can be used for threshold sensing. (C) 2001 Elsevier Science B.V. All rights reserved.
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