An Array of Concentric Composite Nanostructures of Zirconia Nanotubules/Cobalt Nanowires: Preparation and Magnetic Properties

Abstract

Zirconia nanotubules, filled with crystalline cobalt rods (see Figure), were prepared in a reaction sequence of sol–gel crystallization of ZrO2 from zirconyl chloride octahydrate around a template of commercial porous anodic alumina, followed by electrodeposition of cobalt from CoSO4 solution and template removal with 6 N NaOH. The composite shows uniaxial magnetic anisotropy and a coercivity exceeding that of bulk cobalt.

Fabrication parameter-dependent morphologies of self-organized ZrO2 nanotubes during anodization

“…Anodic zirconia (ZrO 2 ) nanotubes have high surface areas which may improve their properties in certain applications [9,10], such as gas sensors [11], fuel cells [12], thermal barrier coatings [13], refractory materials [14], and catalysts [15]. As a result, great efforts have been made to prepare ZrO 2 nanotubes by anodization in fluoride or chlorine ion-containing electrolytes [5,[16][17][18][19][20].…”

Nanolithography and Nanomanipulation

“…Arrays of concentric composite nanowires of ZrO 2 with Co cores were made in an alumina template by the sol-gel method from ZrO 2 sol [48]. The sol was made from ZrOCl 2 Á8H 2 O, ethanol, HNO 3 and acetylacetone.…”

Cataluminescence and Catalysis Properties of CO Oxidation Over Porous Network of ZrO2 Nanorods Synthesized by a Bio-Template

“…ZrO 2 has been widely applied as structural materials, thermal barriers coatings, gas-sensing, solid oxide fuel cell, and catalysts [5][6][7][8]. A variety of anisotropic ZrO 2 particles, e.g., nanotubes [9][10][11][12][13][14][15], nanorods [16][17][18] and nano-laminae [19], have been researched. Compared with artificial templates, biological templates are generally cheap, abundant, and environmentally benign [20].…”