Generation of Ni-Si3N4 nanocomposites by DC, PC and PRC electrodeposition methods

Ni-Si3N4 nanocomposite thin films were fabricated by direct current (DC), Pulse current (PC) and Pulse reverse current (PRC) electrodeposition methods. The structure and surface morphology of thin films were analysed by XRD, Scanning Electron Microscopy and Atomic Force Microscope. Corrosion protection performance of the Ni-Si3N4 nanocomposite on mild steel in 3.5% NaCl corrosive medium was assessed by electrochemical method. Texture coefficient and microhardness of the thin films were determined and discussed. Comparisons and performance of corrosion resistance of these coatings obtained by DC electrodeposition, PC electrodeposition and with PRC electrodeposition were investigated

Grown of highly porous ZnO-nanoparticles by pulsed laser ablation in liquid technique for sensing applications

Pulsed laser ablation technique in deionized water with low laser fluency has been explored to prepare uniform dispersed porous ZnO nanoparticles for sensing applications. Surface morphology, particle size, porous structure, roughness, elemental distribution, and chemical bonding of the synthesized ZnO are analyzed by TEM, FESEM, AFM, EDX, and FTIR spectroscopy, respectively. Sensing behavior is observed by UV–Vis absorption measurements. TEM and FESEM analysis show that the prepared ZnO-coated film has homogeneous, dispersed, highly porous, and crack-free surface; the average particle size are observed ~ 24.72 ± 2.97 nm. The porous structure is responsible for appropriate sensing behavior. Low roughness value ~ 1.52 nm which is analyzed by AFM is advantageous for sensing behavior. EDX spectrum and elements mapping clearly show the uniform Zn and O distribution. XRD analysis confirms the hexagonal wurtzite structure of ZnO. FTIR reveals the Zn and O chemical bonding successfully. UV-Visible analysis exhibits that the prepared ZnO matrix has good incorporation with multi-dyes solutions at pH values 10–12 with significant changes in color behavior. The highest pKa value ~ 9.77 at a wavelength of 598.28 nm was calculated for multi-dyes immobilized ZnO matrix. So, it can be concluded that prepared ZnO nanostructures are potential candidates for sensing application