We have fabricated high-density arrays of individually isolated semispherical nanocapacitors consisting of porous anodic aluminum oxide (AAO) layers as dielectric materials and carbon nanotubes (CNTs) as electrodes. It is shown that the nanocapacitors made with the CNT electrodes exhibit much better C-V behaviors than those without the CNT electrodes. The improved electrical behavior is explained in terms of the use of the CNT electrodes deposited within the porous AAO layers. The capacitance calculated using semispherical capacitor formula is in agreement with the experimental value.
The relationship between the structural properties of Sn nano-dots embedded in a Si electrode synthesised by co-sputtering and their electrochemical performance during a lithium insertion and extraction process has been investigated.
In Al-3 wt pct Mg/Al 2 O 3p (or SiC p ) composites fabricated by the pressureless infiltration method, the infiltration behavior of molten metal, the mechanical properties, and the interfacial reactions were investigated. The spontaneous infiltration of the molten Al-3 wt pct Mg alloy into the powder bed occurred at a relatively low temperature (700 ЊC for 1 hour under a nitrogen atmosphere). Spontaneous infiltration of the molten metal is related to the formation of Mg 3 N 2 by the reaction of Mg and nitrogen. The tensile strength and 0.2 pct offset yield strength and elongation tend to decrease with increasing infiltration temperature and time, because of an increased interfacial reaction. In Al-3Mg/Al 2 O 3 composites, MgAl 2 O 4 was observed at interfaces between Al 2 O 3 and the matrix, as well as at oxide films of the Al powder surface. In addition, MgO was observed at interfaces between Al 2 O 3 and the matrix. On the other hand, Al 4 C 3 was formed at interfaces between SiC and the matrix in Al-3Mg/SiC composites. In addition, MgAl 2 O 4 was observed as a reaction product at the interfaces between oxide films of SiC and the matrix, as well as at oxide films of the Al powder surface. Since the Si released as a result of the interfacial reaction is combined with Mg, age hardening can occur by the precipitation of Mg 2 Si via T6 treatment.
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