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Release time: 2018 - 03 - 14
Ultrathin AAO template was carefully transferred onto the target substrate. Au catalysts were then deposited by using ion beam evaporation technique. The AAO membrane was then peeled off by a tape, remaining only as an ordered Au nanodot array. Taking the Au nanodots as catalyst, nanowire growth can be carried out by many techniques such as pulsed laser deposition (PLD) and chemical vapor deposition (CVD). Fabrication of variety nanowire arrays like MgO, ZnO, GaAs and carbon nanotube have been reported. Fig. 1 Schematic illustration of the proposed process to fabricate sublithographic scale VLS nanowires by using attached AAO freestanding membrane mask.Reference: RSC Advance 2, 10618–10623 (2012);Materials Letters, 154, 40–43 (2015);Applied Physics Letters 81, 5177-5179 (200...
source:
Release time: 2018 - 03 - 14
AAO template is an ideal tool for the fabrication of an array of multiple dots. Here is the schematic drawing of the preparation of the array of multiple dots using ultrathin AAO template.Fig. 1 (left) Schematic drawing of the preparation of the array of multiple dots using ultrathin AAO template. (up, right) SEM images of an array of multiple dots of Au. (bottom, right) scanning Auger microprobe image of the array of bimetallic dots of Au and Ag. The signals from Au, Ag, and Si are shown in green, red, and blue, respectively.In Fig. 1, an idealized schematic of the fabrication of an array of multiple dots is shown. After the mask had been placed on the substrate, the metal was evaporated at an appropriate off normal incident angle. The appropriate angle for the spatially resolved dep...
source:
Release time: 2018 - 03 - 14
Core-shell nanoparticles have been the subject of extensive research due to their potential application in many areas such as microelectronics, optoelectronics, catalysis, and optical devices. In 2005, Yong Lei and Wai-Kin Chim reported the fabrication of highly ordered indium oxide coated indium highly ordered indium oxide coated indium on Si substrates using a three-step oxidation process. First is the preparation of an AAO on the surface of the substrate (Fig. 1a). After the deposition of In (Fig. 1b), the AAO is removed, leaving a highly ordered In nanoparticle array on the substrate. Then, the transformation of In nanoparticles to In/In2O3 Core-shell nanoparticles and In2O3 nanoparticles was realized by a three-step oxidation process (Fig. 1c,d).Fig. 1 Schematic outline of t...
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Release time: 2018 - 03 - 14
Template method for fabrication of ferroelectric nanocapacitor arrays via ultrathin AAO templates, also called ultrathin AAO membranes. AAO template is ideal for fabrication of various ordered nanomaterials.Fig. 1 Fabrication of ferroelectric nanocapacitor arrays via ultrathin AAO templates. Fig.1 shows the pulsed laser deposition of the ferroelectric material Pb(Zr0.20Ti0.80)O3 (PZT) through an ultrathin AAO mask onto a Pt layer on a substrate, followed by the deposition of Pt and then lift-off of the mask to leave an extended array of nanocapacitors. Typical SEM micrograph of the ultrathin AAO mask and as-prepared PZT nanoisland array with the AAO mask visible at the top of the image are also shown. The nanoisland density can be estimated by assuming that the pores are arr...
source:
Release time: 2018 - 03 - 14
Fig.1 Schematic diagrams of the AAO membrane (a) and cross-sectional structure (b)Porous AAO membranes are made up of numerous hexagonal unit cells (Fig. 1a). Each unit cell contains three different distinct parts: (1) A hexagonal inner layer, also called the “skeleton”, which is made up of the common internal walls between the unit cells.(2) An outer layer, between the central pore and the inner layer.(3) An interstitial rod inside the inner layer, at the triple cell junction. Interpore distance (Dint), pore diameter (Dp), barrier layer thickness (tb), pore wall thickness (tw), pore density (ρp), and porosity (P) are important structural parameters (Fig. 1b). For porous AAO membranes with highly ordered pore arrangement, the relationship among these parameters can be expres...
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