Fabrication of Heteronanorod Structures by Dynamic Shadowing Growth

Abstract

Multilayered heterogeneous one-dimensional (1-D) nanostructures are important building blocks for nanodevice applications. A practical nanofabrication technique to produce heterogeneous nanostructures with arbitrary materials must have the ability to control the dimensions and uniformity, to control the alignment, and to control the interfacial properties of the heterogeneous nanostructures. In this paper, we demonstrate a simple but versatile method to fabricate three-dimensional (3-D) heterogeneous nanorod structures by multilayer dynamic shadowing growth (DSG). DSG is a process based on the geometric shadowing effect and substrate rotation in a physical vapor deposition system. By combining DSG and the sputtering technique, we successfully fabricated Au/Si matchstick nanorods which can further be developed as a novel biosensor for Respiratory Syncytial Virus (RSV) detection. By changing the source materials during the deposition, we demonstrate that complicated heterostructured nanorod arrays, such as Si/Ni multilayer nanosprings, can be easily produced, and they exhibit particular magnetic anisotropic behavior. We also use the DSG technique to coat a thin catalyst layer asymmetrically on the side of a nanorod backbone, and therefore design catalytic nanomotors with a variety of geometries capable of performing multiple desired motions in a fuel solution. This fabrication method reveals an optimistic step towards complex heteronanorod array design and fabrication.Index Terms-Au/Si matchstick nanorods, catalytic nanomotor, dynamic shadowing growth, Si/Ni multilayer nanospring.

Design and Characterization of Rotational Multicomponent Catalytic Nanomotors

“…Dynamic shadowing growth4 (DSG) allows alternative catalytic nanomotor designs. DSG utilizes shadowing deposition combined with substrate manipulation11, 12 and a wider range of possible designs exist in comparison to TDEP 4. In this study, we present a multicomponent catalytic nanomotor consisting of a spherical silica colloid with a TiO 2 nanoarm coated asymmetrically with Pt by DSG.…”

Mg Nanostructures Tailored by Glancing Angle Deposition

“…In the mean time, the nucleation sites at (101̅0) and (011̅0) will act as seeds to form vertical and parallel small blade crystals stacking on the old blade, and fan out along the direction perpendicular to the vapor incident direction. In addition, the geometric shadowing effect makes the initially produced central layer(s) accept more Mg atoms than the outer layers, and thus the central layer blade(s) will grow faster than others in both the width and height directions, resulting in a needle shape as viewed from the top and side, as shown in Figures , , and a.…”

Using ZnS Nanostructured Thin Films to Enhance Light Extraction from Organic Light-Emitting Diodes

“…The devices with Alq 3 thin films prepared with electromagnetic field modification as the active layer show lower luminescence intensity and greater current density under the same driving voltage. Robbie et al , reported an effective physical vapor deposition method called glancing angle deposition (GLAD) technology, by which a wide variety of thin film morphologies can be created easily, including cylindrical columns, zigzags, helices, and graded-width structures. − Fu et al designed catalytic nanomotors with a variety of geometries capable of performing multiple desired motions in a fuel solution using the GLAD technology to coat a thin catalyst layer asymmetrically on the side of a nanorod backbone. The organic and inorganic nanocolumns were prepared by thermal deposition and electron beam deposition through GLAD, respectively. , …”