Type

Journal Article

Authors

Justin D. Holmes
Nikolay Petkov
Michael A. Morris
Gareth M Hughes
Richard A Farrell
Ciara T Bolger

Subjects

Engineering

Topics
aligned scale device network nanostructures mesoporous silica physical correlation length in situ sem imaging pore directionality directed self assembly imaging physical epitaxy

Pore directionality and correlation lengths of mesoporous silica channels aligned by physical epitaxy. (2009)

Abstract Herein we report on the alignment of mesoporous silica, a potential host for sub-10 nm nanostructures, by controlling its deposition within patterned substrates. In-depth characterization of the correlation lengths (length of a linear porous channel), defects of the porous network (delamination), and how the silica mesopores register to the micrometer-sized substrate pattern was achieved by means of novel focused ion beam (FIB) sectioning and in situ SEM imaging, which to our knowledge has not previously been reported for such a system. Our findings establish that, under confinement, directed deposition of the sol within channeled substrates, where the cross-sectional aspect ratio of the channels approaches unity, induces alignment of the mesopores along the length of the channels. The pore correlation length was found to extend beyond the micrometer scale, with high pore uniformity from channel to channel observed with infrequent delamination defects. Such information on pore correlation lengths and defect densities is critical for subsequent nanowire growth within the mesoporous channels, contact layout (electrode deposition etc.), and possible device architectures.
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Ireland -> University College Cork -> Tyndall National Institute - Journal Articles
Ireland -> University College Cork -> Chemistry
Ireland -> University College Cork -> Chemistry - Journal Articles
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Full list of authors on original publication

Justin D. Holmes, Nikolay Petkov, Michael A. Morris, Gareth M Hughes, Richard A Farrell, Ciara T Bolger

Experts in our system

1
Justin D. Holmes
University College Cork
Total Publications: 287
 
2
Nikolay Petkov
University College Cork
Total Publications: 64
 
3
Michael A. Morris
University College Cork
Total Publications: 164