Nickel Nanopillar Arrays Electrodeposited on Silicon Substrates Using Porous Alumina Templates

Abstract

Nickel nanopillar arrays were electrodeposited onto silicon substrates using porous alumina membranes as a template. The characterization of the samples was done by scanning electron microscopy, X-ray diffraction, and alternating force gradient magnetometry. Ni nanostructures were directly grown on Si by galvanostatic and potentiostatic electrodeposition techniques in three remarkable charge transfer configurations. Differences in the growth mechanisms of the nanopillars were observed, depending on the deposition method. A high correlation between the height of the nanopillars and the charge synthesis was observed irrespective of the electrochemical technique. The magnetization measurements demonstrated a main dependence with the height of the nanopillars. The synthesis of Ni nanosystems with a controllable aspect ratio provides an effective way to produce well-ordered networks for wide scientific applications.

A Prospective Study: Highlights of Hippocampal Spectroscopy in Cognitive Impairment in Patients with Type 1 and Type 2 Diabetes

“…Cao et al investigated brain metabolites in the frontal and parietal cortex in 33 patients with diabetes and hypertension and noted the significant decrease in NAA/Cr and Cho/Cr ratios [ 21 ]. In our study, hypertension was an important determinant of changes in the hippocampal region.…”

Impedance Spectroscopy of Hierarchical Porous Nanomaterials Based on por-Si, por-Si Incorporated by Ni and Metal Oxides for Gas Sensors

“…Electrochemical etching of silicon wafers was carried out in a 2-chamber cell of the Unno-Imai type; the scheme of the installation is given elsewhere [38][39][40]. The choice of technological conditions for etching is due to the results of previous studies [27,31,41]. With such a crystallographic orientation of silicon (Si (111)) and relatively low anodization current densities, the anodic dissolution of silicon will occur along the directions of the fastest etching (for silicon, this is a family of directions <100>).…”

“…The por-Si substrate with a large specific area was a sensor matrix and graphene was a catalyst material. Compositions based on porous silicon matrices intercalated with nickel and/or nickel oxide are also promising for "multi-response" sensor structures [27][28][29][30][31]. In this case, the properties (catalytic, magnetic, electrophysical, optical, etc.)…”