Study of the Microscopic Surface Structure of a Quartz Substrate    for Surface Acoustic Wave Devices

Noge, Satoru; Araki, N.; Komine, Kenji; Suzuki, Hiroji; Shiraishi, Hideya; Hohkawa, K.

doi:10.1143/jjap.36.3081

Cited by 6 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…AFM studies have shown that a-quartz has a flat (terraced) surface, but no detailed structural information was determined. 8,9 A LEED study of the a-quartz (001) surface gave a (1 Â 1) pattern. 10 However, again no detailed structure was inferred.…”

Section: Introductionmentioning

confidence: 99%

Structure and stability of the (001) α-quartz surface

Goumans

Wander

Brown

et al. 2007

Phys. Chem. Chem. Phys.

201

222

View full text Add to dashboard Cite

Structure and stability of the (001) alpha-quartz surface Article (Published Version) http://sro.sussex.ac.uk Goumans, T P M, Wander, Adrian, Brown, Wendy A and Catlow, C Richard A (2007) Structure and stability of the (001) alpha-quartz surface. Physical Chemistry Chemical Physics, 9 (17). 2146 -2152 . ISSN 1463 This version is available from Sussex Research Online: http://sro.sussex.ac.uk/48679/ This document is made available in accordance with publisher policies and may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the URL above for details on accessing the published version. Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way.Structure and stability of the (001) The structure and surface energies of the cleaved, reconstructed, and fully hydroxylated (001) a-quartz surface of various thicknesses are investigated with periodic density functional theory (DFT). The properties of the cleaved and hydroxylated surface are reproduced with a slab thickness of 18 atomic layers, while a thicker 27-layer slab is necessary for the reconstructed surface. The performance of the hybrid DFT functional B3LYP, using an atomic basis set, is compared with the generalised gradient approximation, PBE, employing plane waves. Both methodologies give similar structures and surface energies for the cleaved and reconstructed surfaces, which validates studying these surfaces with hybrid DFT. However, there is a slight difference between the PBE and B3LYP approach for the geometry of the hydrogen bonded network on the hydroxylated surface. The PBE adsorption energy of CO on a surface silanol site is in good agreement with experimental values, suggesting that this method is more accurate for hydrogen bonded structures than B3LYP. New hybrid functionals, however, yield improved weak interactions. Since these functionals also give superior activation energies, we recommend applying the new functionals to contemporary issues involving the silica surface and adsorbates on this surface.

show abstract

Section: Introductionmentioning

confidence: 99%

Structure and stability of the (001) α-quartz surface

Goumans

Wander

Brown

et al. 2007

Phys. Chem. Chem. Phys.

201

222

View full text Add to dashboard Cite

show abstract

“…In this study, we have considered the damaged layer on the surface of quartz substrates [13,14] as one of the causes of misalignment and kinks of SWNTs. It is known in the field of surface acoustic wave (SAW) devices that the uppermost layer of the surface of quartz substrates is damaged due to wafer preparation processes such as cutting, polishing and wrapping, and that the propagating waves generated by SAW devices can be scattered, attenuated, and dispersed because of this nonuniformity or imperfect crystallinity.…”

mentioning

confidence: 99%

Improvement in alignment of single‐walled carbon nanotubes grown on quartz substrate

Hata

Ohno

Kishimoto

et al. 2011

Phys. Status Solidi (c)

View full text Add to dashboard Cite

Aligned growth of single‐walled carbon nanotubes (SWNTs), which can be realized on a quartz substrate, is important for electron device applications such as high‐frequency transistors. In order to improve the alignment of the SWNTs, we studied pretreatments of the substrate before SWNT growth. When the surface of the quartz substrate was etched using hydrofluoric acid, the alignment and linearity of the grown SWNTs improved. This suggests that it is important to remove the uppermost layer on the surface of as‐received substrates, which is damaged due to the polishing process. We also studied an etching process to remove the damaged layer without increasing surface roughness (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract