Abstract
Novel chitosan–zinc copper oxide (Zn1−xCuxO) composites were electrochemically synthesized through galvanostatic deposition. The prepared chitosan-based composite thin films were elaborately investigated to determine their structural, morphological, compositional, impedance, and corrosion properties. X-ray diffraction analysis was performed to reveal their structural orientation of composite thin films. Energy dispersive analysis by X-ray evidently confirmed the existence of Zn, Cu, and O in the composite thin films. Nyquist plots revealed that the chitosan-Zn1−xCuxO thin films had obvious semi-circular boundaries, and higher resistance was observed for chitosan-ZnO due to the grain boundary effect. Corrosion properties were evaluated using both an electrochemical method and the ASTM weight gain method, which revealed good corrosion rates of 34 and 35 × 10−3 mm/y, respectively, for chitosan-ZnO thin film.
Highlights
Organic-inorganic nanocomposite materials are attracting substantial attention because of their combination feasibility in the properties of organic and inorganic components [1–5]
Anodic corrosion was recorded for the electrochemical route prepared for chitosan-zinc oxide (ZnO), chitosan-Zn0.6Cu0.4O, chitosan-Zn0.3Cu0.7O and chitosan-CuO composite thin films on steel electrodes in 3% NaCl (w/v) medium
Composite thin films of chitosan-ZnO, chitosan-Zn0.6Cu0.4O, chitosan-Zn0.3Cu0.7O, and chitosan-CuO were prepared by electrosynthesis in galvanostatic mode
Summary
Organic-inorganic nanocomposite materials are attracting substantial attention because of their combination feasibility in the properties of organic and inorganic components [1–5]. Recent reports have revealed the electrochemical preparation of various natural biomacromolecules such as chitosan [11,12], alginic acid [13], and hyaluronic acid [14,15], and that electrodeposition is a feasible route to fabricate thin and porous structured films [16,17]. Li et al [22] reported the synthesis of chitosan-ZnO thin films using an electrochemical route. NNaannoo--ssllaabb--lliikkee mmoorrpphhoollooggyy wwaass oobbsseerrvveedd iinn tthhee cchhiittoossaann--ZZnnOO ccoommppoossiittee tthhiinn ffiillmm,, aass sshhoowwnn iinn FFiigguurree 33aa,, iinn wwhhiicchh ssoommee ddiissccoonnttiinnuuiittiieess aanndd oovveerrllaappppiinngg wweerree eevviiddeenntt. The resistance decreased obviously for chitosan-Zn0.6Cu0.4O, chitosan-Zn0.3Cu0.7O, and chitosan-CuO composite thin films compared to chitosan-ZnO due to the grain boundary effect. Lee et al [63] observed a decrease in resistance with an increase in Sn cation composition in ZnO
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