Structure of n-alkyltrichlorosilane mono layers on Si(100)/SiO2
Abstract
The structure of n-alkyltrichlorosilane self-assembled monolayers (SAMs) of alkyl chain lengths n = 12, 14, 18, and 22 formed on the amorphous native oxide of silicon (100) has been investigated via angstrom-resolution surface X-ray scattering techniques, with particular focus on the proliferation of lateral order along the molecules’ long axis. Grazing incidence diffraction shows that the monolayer is composed of hexagonally packed crystalline-like domains for n = 14, 18, and 22 with a lateral size of about 60 Å. However, Bragg rod analysis shows that ~12 of the CH2 units are not included in the crystalline-like domains. We assign this, and the limited lateral crystallites’ size, to strain induced by the size mismatch between the optimal chain–chain and headgroup–headgroup spacings. Lastly, analysis of X-ray reflectivity profiles for n = 12, 14, and 22 shows that the density profile used to successfully model n = 18 provides an excellent fit where the analysis-derived parameters provide complementary structural information to the grazing incidence results.
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Friedrich-Alexander-Univ Erlangen-Nurnberg, Erlangen (Germany)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1240699
- Report Number(s):
- BNL-111848-2016-JA
Journal ID: ISSN 0743-7463; R&D Project: PO034; KC0203010
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Langmuir
- Additional Journal Information:
- Journal Volume: 31; Journal Issue: 43; Journal ID: ISSN 0743-7463
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
H. -G. Steinruck, Ocko, B., Will, J., and Magerl, A. Structure of n-alkyltrichlorosilane mono layers on Si(100)/SiO2. United States: N. p., 2015.
Web. doi:10.1021/acs.langmuir.5b03091.
H. -G. Steinruck, Ocko, B., Will, J., & Magerl, A. Structure of n-alkyltrichlorosilane mono layers on Si(100)/SiO2. United States. https://doi.org/10.1021/acs.langmuir.5b03091
H. -G. Steinruck, Ocko, B., Will, J., and Magerl, A. Mon .
"Structure of n-alkyltrichlorosilane mono layers on Si(100)/SiO2". United States. https://doi.org/10.1021/acs.langmuir.5b03091. https://www.osti.gov/servlets/purl/1240699.
@article{osti_1240699,
title = {Structure of n-alkyltrichlorosilane mono layers on Si(100)/SiO2},
author = {H. -G. Steinruck and Ocko, B. and Will, J. and Magerl, A.},
abstractNote = {The structure of n-alkyltrichlorosilane self-assembled monolayers (SAMs) of alkyl chain lengths n = 12, 14, 18, and 22 formed on the amorphous native oxide of silicon (100) has been investigated via angstrom-resolution surface X-ray scattering techniques, with particular focus on the proliferation of lateral order along the molecules’ long axis. Grazing incidence diffraction shows that the monolayer is composed of hexagonally packed crystalline-like domains for n = 14, 18, and 22 with a lateral size of about 60 Å. However, Bragg rod analysis shows that ~12 of the CH2 units are not included in the crystalline-like domains. We assign this, and the limited lateral crystallites’ size, to strain induced by the size mismatch between the optimal chain–chain and headgroup–headgroup spacings. Lastly, analysis of X-ray reflectivity profiles for n = 12, 14, and 22 shows that the density profile used to successfully model n = 18 provides an excellent fit where the analysis-derived parameters provide complementary structural information to the grazing incidence results.},
doi = {10.1021/acs.langmuir.5b03091},
journal = {Langmuir},
number = 43,
volume = 31,
place = {United States},
year = {Mon Oct 05 00:00:00 EDT 2015},
month = {Mon Oct 05 00:00:00 EDT 2015}
}
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