Fabrication and characterization of highly ordered Au nanowire arrays

Abstract

In this paper, we report the electrochemical fabrication of highly ordered Au nanowire arrays within hexagonal close-packed nanochannel alumina (NCA) templates with pore diameters ranging from 35 nm to 100 nm. The observations of TEM, SAED, and HRTEM show that single crystal Au nanowires have been obtained within the templates with 45 nm diameters. The growth mechanism of the single crystal Au nanowires is also discussed.

Gold Nanostructures Prepared on Solid Surface

“…Such top-down approaches, however, are cumbersome and have a low yield, which hinders practical applications. High throughput approaches for the synthesis of metallic nanowires are thus intensely searched [44][45][46][47][48]. In general, the production of arrays of nanostructures on substrates by lithographic techniques presents the disadvantage of high cost and a restriction in the number of materials to which it can be applied.…”

Atomistic modeling of nanowires, small-scale fatigue damage in cast magnesium, and materials for MEMS

“…Fatigue cracks growing in the vacuum generally grew much more slowly, i.e., more cyclic damage was required to accumulate ahead of the crack tip (Figure 2.14). Previous studies have shown that long fatigue cracks grow more slowly in lower humidity environments [13, 141. The small fatigue cracks in the vacuum environment were found to propagate preferentially through persistent slip bands formed ahead of the crack tip as has been previously observed in cast Mg [18] and other alloys [25]. Fatigue cracks prefer to propagate along the persistent slip bands because these regions have been weakened by intense dislocation activity and cracking.…”

“…Local chemical composition was determined with Energy Dispersive X-ray (EDX) analysis. In-situ tests conducted in the SEM do not provide significantly more resolution as compared to other techniques such as replica methods [18], but allow both EDX analysis and imaging using backscattered electrons that can provide additional microstructural information. Completely reversed (R = Gmin/Gmax = -1) fatigue tests were performed at a displacement rate of 20 p d s .…”

“…Recent work on free-standing metallic thin films is more applicable to bimaterial microcantilevers since the films have been studied in the asdeposited state at lower temperatures and stresses [ 16, 25, 261. Previous studies have examined the nonlinear thermo-elastic behavior [44], thermomechanical cyclic response [27, 451, and creep behavior [18, 191 of AdSi microcantilevers and microplates. Prior creep and stress relaxation studies on AdSi microstructures have examined creep in plates and beams after an annealing temperature of 190 "C and a hold temperature of 120 "C [18,191. The effect of different annealing temperatures or hold temperatures was not considered.…”

“…A contraction of the Au, either due to a differential thermal expansion between Au and Si or a time-dependent inelastic strain in the Au, leads to an increase in curvature of the bimaterial beam (Figure 3.1 Bimaterial cantilevers containing a metallic layer may be vulnerable to creep and/or stress relaxation. Several researchers have observed creep and stress relaxation in metallic materials for MEMS including fieestanding thin films and bimaterial microcantilevers [16][17][18][19][20][21][22][23][24][25][26][27]. In bimaterial microcantilevers, moderate creep strain in the metallic layer can lead to a significant change in the position of the transducer over time (Figure 3.1).…”