Photodielectric Properties of C60 Solution in the Ferroelectric Liquid Crystal

• Published in: Molecular crystals and liquid crystals (Philadelphia, Pa. : 2003) Vol. 496; no. 1; pp. 269 - 277
• Main Authors: Koval'chuk, A. V., Koval'chuk, T. N.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 2008
• Subjects: dielectric spectroscopy; ferroelectric liquid crystal; fullerene
• ISSN: 1542-1406; 1563-5287; 1543-5318
• DOI: 10.1080/15421400802451865

Within the range of 10
−3
-10
6
 Hz, we investigated the frequency dependences of capacity C and resistance R of a 3 wt% solution of C
60
with attached molecules of 1,8-octanediamine in a ferroelectric liquid crystal (FLC/C60-Ok). The measurements were carried out in darkness and on the exposure to focused white light. The basic feature of the electric properties of solutions of FLC/C
60
-Oc is a reduction of the ac conductivity σ
AC
at the transition from the cholesteric to smectic phase. The measurements have shown that the ratio C
P
/C
D
(the subscripts D and P correspond, respectively, to measurements in darkness and under illumination) has a peak at a frequency of ≈ 3.5 Hz, and the ratio R
D
/R
P
increases monotonously up to a constant value within the range of 10
−3
-10
3
 Hz. These data indicate that the volumetric photoelectric processes are more essential than the near-electrode ones in the solution FLC/C
60
-Oc as compared with the colloidal mixture C
60
 + C
70
/FLC.