Fabrication of nanostructure via self-assembly of nanowires within the AAO template

The novel nanostructures are fabricated by the spatial chemical modification of nanowires within the anodic aluminum oxide (AAO) template. To make the nanowires better dispersion in the aqueous solution, the copper is first deposited to fill the dendrite structure at the bottom of template. During the process of self-assembly, the dithiol compound was used as the connector between the nanowires and nanoparticles by a self-assembly method. The nanostructures of the nano cigars and structure which is containing particles junction are characterized by transmission electron microscopy (TEM). These kinds of novel nanostructure will be the building blocks for nanoelectronic and nanophotonic devices

Oxidation Kinetics Of Nickel Solar Absorber Nanoparticles

The alumina matrix of an electrolytically deposited solar absorber coating was etched away leaving nickel nanorods standing on an aluminium support. The oxidation kinetics of the nickel nanorods, with an approximate diameter of 30 nm and a height of approximately 300 nm, was determined by Infrared (IR) spectroscopy. The IR absorption by longitudinal optical (LO) phonons in NiO was measured before and after exposure to pure oxygen at 260, 280, 300, 320 and 350∞C for different times. The absorptance peak height was determined and used as a measure of the degree of oxidation. The five different isotherms showed power law behaviour with an exponent varying between 0.52 and 0.69. A fit to the homogeneous linear diffusion equation, derived for spherical geometry, gave parabolic rate constants, which are in agreement with data for larger nickel particles and bulk nickel. The deviations in the exponent from that of the parabolic law are discussed in terms of particle geometry and particle agglomeration. The apparent activation energy was determined by the use of a master plot technique to be 1.73 eV