The peculiar electrical response of liquid crystal-carbon nanotube systems as seen by impedance spectroscopy

García García, Amanda; Vergaz, Ricardo; Algorri Genaro, José Francisco; Geday, Morten Andreas y Otón Sánchez, José Manuel (2015). The peculiar electrical response of liquid crystal-carbon nanotube systems as seen by impedance spectroscopy. "Journal of Physics D: Applied Physics", v. 48 (n. 37); pp. 1-8. ISSN 0022-3727. https://doi.org/10.1088/0022-3727/48/37/375302.

Descripción

Título: The peculiar electrical response of liquid crystal-carbon nanotube systems as seen by impedance spectroscopy
Autor/es:
  • García García, Amanda
  • Vergaz, Ricardo
  • Algorri Genaro, José Francisco
  • Geday, Morten Andreas
  • Otón Sánchez, José Manuel
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Physics D: Applied Physics
Fecha: Agosto 2015
Volumen: 48
Materias:
Palabras Clave Informales: Impedance spectroscopy, carbon nanotube, liquid crystal, electric equivalent circuit, electrical response
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Tecnología Fotónica y Bioingeniería
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Conductive nanoparticles, especially elongated ones such as carbon nanotubes, dramatically modify the electrical behavior of liquid crystal cells. These nanoparticles are known to reorient with liquid crystals in electric fields, causing significant variations of conductivity at minute concentrations of tens or hundreds ppm. The above notwithstanding, impedance spectroscopy of doped cells in the frequency range customarily employed by liquid crystal devices, 100 Hz?10 kHz, shows a relatively simple resistor/capacitor response where the components of the cell can be univocally assigned to single components of the electrical equivalent circuit. However, widening the frequency range up to 1 MHz or beyond reveals a complex behavior that cannot be explained with the same simple EEC. Moreover, the system impedance varies with the application of electric fields, their effect remaining after removing the field. Carbon nanotubes are reoriented together with liquid crystal reorientation when applying voltage, but barely reoriented back upon liquid crystal relaxation once the voltage is removed. Results demonstrate a remarkable variation in the impedance of the dielectric blend formed by liquid crystal and carbon nanotubes, the irreversible orientation of the carbon nanotubes and possible permanent contacts between electrodes.

Proyectos asociados

TipoCódigoAcrónimoResponsableTítulo
Comunidad de MadridS2013/ MIT-2790Sin especificarSin especificarSin especificar
Gobierno de EspañaTEC2013-47342-C2Sin especificarSin especificarSin especificar

Más información

ID de Registro: 40704
Identificador DC: http://oa.upm.es/40704/
Identificador OAI: oai:oa.upm.es:40704
Identificador DOI: 10.1088/0022-3727/48/37/375302
URL Oficial: http://iopscience.iop.org/article/10.1088/0022-3727/48/37/375302/meta
Depositado por: Memoria Investigacion
Depositado el: 06 Jun 2016 18:50
Ultima Modificación: 01 Sep 2016 22:30
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