Taking a little off the top : nanorod array morphology and growth studied by focused ion beam tomography

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DOIResolve DOI: http://doi.org/10.1021/la103070x
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Journal titleLangmuir
Pages1755817567; # of pages: 10
SubjectContinuous data; Core structure; Critical parameter; Device application; Dual-beam; FIB/SEM; Foundation materials; Glancing angle deposition; High surface area; Homogeneous structure; Internal morphology; Large aspect ratio; Multiple samples; Nano-columns; Nanocolumn; Nanorod arrays; Population densities; Porous nature; Power law scalings; Reconstruction process; SEM; Synthesis techniques; TiO; Top surface
AbstractThe high surface area, large aspect ratio, and porous nature of nanorod arrays make them excellent foundation materials for many devices. Of the many synthesis techniques for forming nanorods, glancing angle deposition (GLAD) offers one of the more straightforward and flexible methods for ensuring control of alignment, porosity, and architecture of the nanorods. Here we demonstrate the first use of a dual-beam (focused ion beam (FIB) combined with scanning electron microscopy (SEM)) instrument to section and image the internal morphology of a nanorod array fabricated using the GLAD technique. We have used the FIB-SEM to reconstruct the 3D composition of TiO 2 nanorods, allowing us to visualize for the first time the core structures of many potential devices. We have also been able to probe the relationship between critical parameters such as diameter (w̄ act), internanorod spacing (v̄ act), center-to-center spacing (c̄ act), and nanorod population density (d act) and the depth of the nanocolumn (t) for a single homogeneous structure. A continuous data set was obtained from a single 5-μm-thick GLAD film, avoiding the artifacts arising from the analysis of the top surfaces of multiple samples of varying thicknesses. An analysis of the acquired sectioned data has allowed us to determine that the critical nanocolumn parameters follow a power-law scaling trend with w̄ act=9.4t 0.35 nm, v̄ act = 15.2t 0.25 nm, c̄ act=24.8t 0.31 nm, and d act=3402t -0.65 columns μm -2. Using the FIB/SEM images acquired for the TiO 2 nanorods, we have also investigated the evolution of individual nanocolumns and have observed that bifurcation and branching play a significant role in the extinction or survival of these nanorods. These findings will allow for the optimization of nanorod properties for device applications. Also, the FIB sectioning and reconstruction process developed here will permit for the investigation of nanorod arrays formed from a range of synthesis techniques and materials.
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AffiliationNational Institute for Nanotechnology; National Research Council Canada
Peer reviewedYes
NPARC number19734711
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Record identifierc66f0770-01a0-4f98-9695-65aa3b0a2be2
Record created2012-04-19
Record modified2016-05-09
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