Impedance spectroscopic investigation of the effect of thin azo-calix[4]arene film type on the cation sensitivity of the gold electrodes

Mlika, R.; Rouis, A.; Bonnamour, Isabelle; Ouada, H. Ben

doi:10.1016/j.msec.2011.05.017

Cited by 19 publications

(12 citation statements)

References 27 publications

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“…On the other hand, we notice that the basic component γincreases after the modification of ITO surface by the β-CD from (8.3 mJ /m 2 ) to (35 mJ /m 2 ), due to the presence of basic groups (OH) ( Table 1). This clearly proves that the alignment layers were well deposited 22 . Ө°water : water contact angle (°) ; Ө°For : formamide contact angle (°) ; Ө°DIM : diiodomethane contact angle (°); γ s = γ d + γ p : surface energy; γ d : dispersive energy; γ p =( 2 γ + γ -) 1/2 : polar energy; γ + : acid energy component; γ -:basic energy component 9,12 .…”

Section: Contact Angle Measurementsupporting

confidence: 64%

“…This result proves that the surface became more hydrophilic. The reduction of the surface hydrophobicity can be attributed to the presence of the hydroxyl groups (OH: Hydrophilic functional) on the surface of the membrane 22 . On the other hand, we notice that the basic component γincreases after the modification of ITO surface by the β-CD from (8.3 mJ /m 2 ) to (35 mJ /m 2 ), due to the presence of basic groups (OH) ( Table 1).…”

Section: Contact Angle Measurementmentioning

confidence: 99%

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Dielectric relaxation behavior of nematic liquid crystal cell using β-cyclodextrin as an alignment layer

Sahraoui

Abderrahmen²,

Mlika³

et al. 2016

Mediterr.J.Chem

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In the present investigation, we report the dielectric properties of a symmetric Nematic Liquid Crystal (NLC) cell using Beta Cyclodextrins (β-CD) as alignment layers. These layers were deposited onto Indium Tin Oxide (ITO) surface by thermal evaporation and then characterized using contact angle measurement. This revealed a hydrophilic character attributed to the presence of hydroxyl groups. Morphological study was carried out by Scanning Electronic Microscopy (SEM).The dynamic impedance study of the Liquid Crystal (LC) cell in a wide frequency range from 1mHz to 13MHz was reported. It was found that the β-CD alignment layer had a blocking effect on the NLC cell at a high frequency range. We also report the relaxation mechanism of NLC cell which is modeled by an appropriate equivalent circuit in order to understand the electrical properties of the liquid crystal cell and to investigate the processes taking place at different interfaces.

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Section: Contact Angle Measurementsupporting

confidence: 64%

Section: Contact Angle Measurementmentioning

confidence: 99%

Dielectric relaxation behavior of nematic liquid crystal cell using β-cyclodextrin as an alignment layer

Sahraoui

Abderrahmen²,

Mlika³

et al. 2016

Mediterr.J.Chem

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“…The two constant phase elements CPE1 and CPE2 are non-ideal capacitances and can be expressed by [44][45][46][47][48][49]:…”

Section: Modelisation Of the Resultsmentioning

confidence: 99%

“…Finally, the experimental EIS measurements were fitted using the Frequency Response Analysis (FRA) software. The different fits were made with a total error value of v 2 % 10 À2 [46,47].…”

Section: Modelisation Of the Resultsmentioning

confidence: 99%

Development of a perchlorate sensor based on Co-phthalocyanine derivative by impedance spectroscopy measurements

Braik

Dridi

Ali

et al. 2015

Organic Electronics

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“…3.3.1 NiPc film behaviour at applied potentials: EIS is a sensitive method used to explore the interface properties between electrode and solution [36,37]. In order to establish the optimised conditions in terms of voltage and frequencies, the influence of applied potentials were investigated.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Studies on the electrochemical properties of nickel phtalocyanine for impedimetric detection of environment pollutants: hydroquinone and bisphenol A

Zahou

Mlika

BenChaabane

et al. 2015

IET Science, Measurement & Technology

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International audienceA self-assembled film of nickel phtalocyanine (NiPc) has been immobilised onto gold (Au) substrate to develop a new impedimetric method for environmental pollutants detection. NiPc/Au electrode was first characterised using contact angle measurements and cyclic voltammetry to investigate the adhesion and the kinetic behaviour of the self-assembled film. Results demonstrated the interaction between Au and benzene group and at the same time showed the formation of a completely covered NiPc layer on the Au surface. In addition, the NiPc film seems to exhibit reversible redox behaviour and is found to act as an electronic conductor which allows rapid electron transfer. The electrochemical impedance spectroscopy spectra of the NiPc/Au electrode, as a function of hydroquinone (HQ) and Bisphenol A (BPA) concentration, reveal that the value of the charge transfer resistance increases with increased concentration. The electrical behaviour of the structure was studied according to an equivalent circuit by fitting the experimental spectra. Moreover, this technique demonstrates that this membrane exhibits a high sensitivity towards the toxic pollutants HQ and BPA. The differences in selectivity are clearly displayed by variations in the membrane resistance (R-m) and in the charge transfer resistance (R-tc) of the interface

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Impedance spectroscopic investigation of the effect of thin azo-calix[4]arene film type on the cation sensitivity of the gold electrodes

Cited by 19 publications

References 27 publications

Dielectric relaxation behavior of nematic liquid crystal cell using β-cyclodextrin as an alignment layer

Dielectric relaxation behavior of nematic liquid crystal cell using β-cyclodextrin as an alignment layer

Development of a perchlorate sensor based on Co-phthalocyanine derivative by impedance spectroscopy measurements

Studies on the electrochemical properties of nickel phtalocyanine for impedimetric detection of environment pollutants: hydroquinone and bisphenol A

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