Electrodeposition-Anodization Preparation of Nanocrystalline Nickel Ferrite Films From Aqueous Sulfate Solutions: A Material for Sensing of Toxic Household Gases and Health Monitoring

Abstract

В данной работе была исследована тонкая пленка нанокристаллического феррита никеля NiFe2O4, синтезированная методом электроосаждения-анодирования. Электроосажденные сплавы NiFe2 получали из водной сульфатной ванны. В водном (1 М КОН) растворе при комнатной температуре данные сплавы подвергали электрохимическому оксидированию (анодированию) до соответствующих гидроксидов и затем выдерживали на воздухе при 400 °С в течение 2 часов. Были оптимизированы следующие параметры, влияющие на электроосаждение сплавов NiFe2: температура ванны, методика перемешивания и плотность тока. Кристаллическая структура, размеры кристаллов и микроструктура полученных ферритов были исследованы методами рентгенодифракции и сканирующей электронной микроскопии. Рентгенодифракция показала, что NiFe2O4 имеет структуру шпинели, и размер кристаллов составляет 16 нм. Сканирующая электронная микроскопия полученных ферритовых частиц показала наличие искаженной прямоугольной структуры и полуквадратичной морфологии.

Electrochemical Performance of Nanocrystalline Zinc Ferrite Films Synthesized Using Electrodeposition

“…On agitating the solution at 500 rpm, the deposition potential of the cathodic peak (C1) was shifted to peak (C2) at potential -1.58 V. Moreover, the current density was increased from -60 to -90 mA cm -2 . Furthermore, on agitating the solution from 500 to 1000 rpm, the current density was increased from -90 to -105 mA cm -2 , and the cathodic peak(C1) was shifted to peak (C3) at potential -1.7 V. This may be due to the fact that, increasing the solution agitation rate reduces the thickness of the adjacent cathodic layer, which in turn shortness the diffusion path of the deposition metals [10][11]. On the other hand, anodic peaks (A1, A2, A3) were appeared in the scan in positive direction.…”

“…The increment of bath temperature enhances the rate of diffusion and ionic nobilities which enhances the conductivity of deposition bath. The decrease in deposition potential with increasing temperature might be due to the increase in the content of more noble metal in the deposited alloy [11]. The film deposited at room temperature was adherent, homogeneous and coherent.…”

“…The anodization current density was 10 mA cm -2 for 5 minutes at 1 M KOH. The conversion of MFe2 alloy to the corresponding ferrite (MFe 2 O 4 ) via the hydroxide form can be explained with conversion of MFe2 to MFe2O4 [8][9][10][11][12] • Physical characterization of deposited film of ZnFe 2 O 4…”

Preparation and characterization of cobalt ferrite CoFe2O4 thin films from alcoholic medium and their application restrictions

“…Spinel ferrite components have attracted attention recently due to its potential technological applications, MFe2O4 nanoparticles (M denotes metal with two valences ion e.g., Cu, Mg, Mn, Ni, Fe, etc.) such as in multilayer chip inductors, EMI overpowering, gas detection, transformer cores, antenna rods, inductors, magnetic loudspeakers, radio frequency paths, highquality filters, power transformers in microelectronics, and read/write heads for high-speed digital tape [1][2][3][4][5][6][7][8][9][10][11]. High magnetic properties distortion, which is created in the spin-orbit (L-S) coupled with crystal frames, is the principal reason for the use of Co-ferrite for medical applications.…”