Influence of silver ion reduction on electrical modulus parameters of solid polymer electrolyte based on chitosan-silver triflate electrolyte membrane

Abstract

Abstract. The electric modulus properties of solid polymer electrolyte based on chitosan: AgCF3SO3 from 303 to 393 K have been investigated by using impedance spectroscopy. The shift of the M″ peak spectra with frequeny depends on the dissociation and association of ions. The lowest conductivity relaxation time τσ, was found for the sample with the highest conductivity. The real part of electrical modulus shows that the material is highly capacitive. The asymmetric peak of the imaginary part of electric modulus M″, predicts a non Debye type relaxation. The distribution of relaxation times was indicated by a deformed arc form of Argand plot. The increase of M′ and M″ values above 358 K can be attributed to the transformation of silver ions to silver nanoparticles. The complex impedance plots and ultraviolet-visible (UV-vis) absorption spectroscopy indicate the temperature dependent of silver nanoparticles in chitosan-silver triflate solid electrolyte. The formation of silver nanoparticles was confirmed by transmission electron microscopy (TEM). The scaling behavior of M″ spectra shows that the dynamical relaxation processes is temperature independent for aparticular composition. The β exponent value indicate that the conductivity relaxation is highly non exponential.

New Method for the Development of Plasmonic Metal-Semiconductor Interface Layer: Polymer Composites with Reduced Energy Band Gap

“…This is due to the strong absorption property of silver nanoparticles in the visible region as a result of the SPR phenomenon [21]. It is well established that the absorption band, which is peaked between 420 nm and 520 nm, can be related to the silver metal particles formation [16,18,22]. Furthermore, the intensity of SPR peak of the composite samples is found to be higher than that of CS : AgTf system.…”

“…Such AgO adsorptions are believed to be responsible for the shrinkage of the band gap. From Figure 6, the large amount of silver particles appears as a dark color spot [16,22]. Similarly, TEM method was also used by Vimala et al to observe the formation and distribution of silver nanoparticles in chitosan : AgNO 3 nanocomposite [32].…”

“…Polymers, such as CS, poly(ethylene oxide) (PEO), poly(2-ethyl-2-oxazoline) (POZ), and poly(vinyl pyrrolidone) (PVP), containing polar 2 Journal of Nanomaterials groups have been introduced as a polymer solvent for the silver salts to be dissolved [12]. Earlier works established that lone-pair electrons on the functional groups of polar polymers are responsible for the complexation and reduction of silver ions to silver nanoparticles [13][14][15][16]. This phenomenon (i.e., Ag + → AgO) limits the application of silver-based ionconducting polymer electrolytes in electrochemical devices [17,18].…”

Investigation of correlation between dielectric parameters and nanostructures in aqueous solution grown poly(vinyl alcohol)-montmorillonite clay nanocomposites by dielectric relaxation spectroscopy

“…Interpretation of relaxation phenomena via electric modulus formalism offers some advantages upon permittivity and conductivity relaxation treatments since large variation in the ε′ and ε″ values at low frequencies and high temperature are minimized [23,26,[29][30][31]37]. Further, difficulties occurring in the analysis of dielectric spectra from the electrode nature (electrode material), the electrodespecimen electrical contact and the injection of space charges and absorbed impurities can be neg- lected in the electric modulus spectra.…”

“…Complex impedance spectroscopy is commonly used to separate the electrode polarization (EP) effect and bulk material properties, which is distinguished by the appearance of two different arcs in the complex impedance plane plots (Z″ vs. Z ′) [12,37,[38][39][40]. The EP phenomena occur due to formation of electric double layer (EDL) capacitances by the free charges that build up at the interface between the dielectric material and electrode surfaces in plane geometry.…”