Numerical elimination methods of ITO cell contribution to dielectric spectra of ferroelectric liquid crystals

2011 ◽  
Vol 19 (2) ◽  
Author(s):  
P. Perkowski
Keyword(s):  
Liquid Crystal ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
High Frequency ◽  
Ito Cell ◽  
Ferroelectric Liquid Crystals ◽  
Cell Behaviour ◽  
Ito Cells ◽  
High Frequencies ◽  
Rc Circuit

AbstractIndium tin oxide (ITO) electrodes are widely used for liquid crystal applications as well as for measuring cells. Unfortunately, ITO layer possesses its own non zero resistivity R which produces (with the capacity C) the cut-off frequency f0 of RC circuit. Dielectric spectroscopy cannot be performed for high frequencies because of high frequency losses caused by the cell behaviour. Four procedures for estimating and extracting high frequency losses in ITO cells are presented and compared in this paper. Their limitations and viability are discussed.

How to determine parameters of soft mode from dielectric spectroscopy performed using cells with ITO electrodes?

2011 ◽  
Vol 19 (1) ◽  
Author(s):  
P. Perkowski
Keyword(s):  
Liquid Crystal ◽  
Tin Oxide ◽  
Dielectric Spectroscopy ◽  
Indium Tin Oxide ◽  
High Frequency ◽  
Soft Mode ◽  
Classical Method ◽  
New Method ◽  
High Frequencies ◽  
First Time

AbstractIndium tin oxide (ITO) electrodes are widely used for liquid crystal applications as well as for measuring cells. Unfortunately, ITO layer possesses its own non zero resistivity R, which produces (with the cell capacity C0) the cut-off frequency f0 of RC0 circuit. From this reason, dielectric spectroscopy for high frequencies cannot be performed directly. The limits of classical method of extracting high frequency losses are shortly discussed. The new method of extracting high frequency losses is used for the first time for the experimental data. The new method can also evaluate the shrinkage of measuring cell gap after filling with liquid crystal.

Development of a carboxyl-terminated Indium Tin Oxide electrode for improving cell adhesion and facilitating low noise, real-time impedance measurements

2021 ◽  
Author(s):  
A.M. Ilyas ◽  
Md Kowsar Alam ◽  
Jamal-Deen Musah ◽  
Lin Oo SAW ◽  
Chi-Chung Yeung ◽  
...  
Keyword(s):  
Cell Adhesion ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Time Course ◽  
Low Noise ◽  
Collective Cell Migration ◽  
Signal Loss ◽  
Ito Cell ◽  
Cell Substrate ◽  
Multiple Cells

The working electrode's surface property is crucial to cell adhesion and signal collection in electric cell-substrate impedance spectroscopy (ECIS). To date, the indium tin oxide (ITO) based working electrode is of interest in ECIS study due to its high transparency and biocompatibility. Of great concern is the impedance signal loss, distortion, and data interpretation conflict profoundly created by the movement of multiple cells during ECIS study. Here, a carboxyl- terminated-ITO substrate was prepared by stepwise surface amino silanization, with N-Hydroxy succinimide (NHS), and (1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide hydrochloride) (EDC) treatment, respectively. We investigated the stepwise changes in the property of the treated ITO, cell-substrate adhesion, collective cell mobility, and time course of change in absolute impedance from multiple CHO cells ((Δt-Δ|Z|)CELLS). The carboxyl-terminated ITO substrate with a surface roughness of 6.37 nm shows enhanced conductivity, 75% visible light transparency, improved cell adherence, reduced collective cell migration speed by ~2 fold, and diminished signal distortion in the ((Δt-Δ|Z|)CELLS). Thus, our study provides an ITO surface-treatment strategy to reduce multiple cell movement effects and to obtain essential cell information from the ECIS study of multiple cells through undistorted (Δt-Δ|Z|)CELLS

Application of ultra-thin indium–tin–oxide film in liquid crystal lens

2019 ◽  
Vol 119 ◽  
pp. 105603 ◽  
Author(s):  
Che Ju Hsu ◽  
Kaushlendra Agrahari ◽  
Pravinraj Selvaraj ◽  
Wei Fan Chiang ◽  
Chia Yi Huang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Oxide Film ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Liquid Crystal Lens

scholarly journals Reference-Electrode Free pH Sensing Using Impedance Spectroscopy

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 742 ◽  
Author(s):  
Laura Folkertsma ◽  
Lennart Gehrenkemper ◽  
Jan Eijkel ◽  
Karin Gerritsen ◽  
Mathieu Odijk
Keyword(s):  
Impedance Spectroscopy ◽  
Double Layer ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Reference Electrode ◽  
Ph Sensing ◽  
Low Frequencies ◽  
High Frequencies ◽  
Double Layer Capacity ◽  
Proof Of Principle

We present a reference-electrode free sensor able to measure both pH and conductivitybased on impedance spectroscopy. The electrode is made of a layer of indium-tin-oxide (ITO). Theimpedance of this electrode at low frequencies depends on its double layer capacity, which varieswith pH due to modification of oxide groups at the ITO surface. At high frequencies, the impedanceis determined by the resistance in the system, which corresponds to the inverse conductivity of thesolution. Because no reference electrode is needed for this technique, miniaturization of the pHsensor is simple. We demonstrate a proof-of-principle experiment of the sensor for human plasmapH measurements.

Liquid crystal (LC) monolayer on Indium Tin Oxide (ITO): structural and electrochemical characterization

RSC Advances ◽  
2014 ◽  
Vol 4 (32) ◽  
pp. 16409-16417 ◽  
Author(s):  
S. Umadevi ◽  
V. Ganesh ◽  
Sheela Berchmans
Keyword(s):  
Liquid Crystal ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Electrochemical Characterization

Superior quality, stable monolayers of LC compounds on ITO substrates are found to be very effective in orienting bulk LC samples.

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