Chemical Modification of Ag Nanoparticles Coated Cotton Textile withValdecoxib Derivate and Study of its Electrochemical Behavior

Electrically conductive textiles have been of increasing research interest due to potentialapplication in clothing as well as in the medical and military fields, as sensors, actuators,electromagnetic shields etc. In this study, conductive cotton textile was prepared by in situsynthesis of Ag nanoparticles using inkjet printing on surface textile. For preparation of flexibleelectrode, conductive textiles was coated with hydrophobic agent contain potassium trimethoxymethyl silane, then with waterproof glue (PVA) was attached on plastic film. Different printingprocedures for achievement of highest conductivity were examined, that its results are presentedin Table 1. Electrochemical experiments were performed with a m-Autolab potentiostat (Eco ChemieUtrecht) with GPES 4.9 software. The cell was equipped with a flexible electrode as a workingelectrode, a platinum electrode as an auxiliary electrode and a Ag/AgCl /3 M KCl as a referenceelectrode. The prepared flexible electrodes was immersed in 0.1 M phosphate buffer solution (pH7.0) and cyclic voltammetry (CV) experiments was conducted in − 0.4 to 1.1 V at a sweep rate of20 mV/S. The resulted CVs were compared to confirm the performance of the every printingprocedures (Fig. 1). Redox characteristic peaks is not observed in of the graphs of a, b and c,however, in graph (d), an oxidation peak and a reduction peak is observed at 0.58 V and - 0.073 V, which are related to the redox of silver. Thus AAAASS procedure as proper design to preparea flexible electrode is chosen. The Valdecoxib derivative modified Flexible Electrode (VFE) wasprepared by the self-assembling technique, just by placing 20.0 mL of a 1.0 mM Valdecoxibderivative solution directly onto the FE surface and drying it at room temperature. The CVs of VFE in a 0.1 M phosphate buffer (pH = 7.0) at various scan rates (10-70 mV/S) areshown in Fig. 2. As shown in Fig. 2, the ratio of cathodic-to-anodic peak currents obtained atvarious scan rates is almost constant. Furthermore, the cathodic and anodic currents increaselinearly with the scan rate in the whole worked scan rate potentials as predicted theoretically for asurface-immobilized redox couple. The linear dependence indicates that the nature of the redoxprocess is diffusionless and controlled.

کلیدواژه ها:

Flexible sensor ، Valdecoxib ، ink jet print ، silver nanoparticle ، conductive textile