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Title: Pseudorotational epitaxy of self-assembled octadecyltrichlorosilane monolayers on sapphire (0001)

Journal Article · · Physical Review Letters
 [1];  [1];  [2];  [3]
  1. Univ. of Erlangen-Nurnberg, Erlangen (Germany)
  2. Bar-Ilan Univ., Ramat-Gan (Israel)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)

The structure of octadecyltrichlorosilane self-assembled monolayers (SAMs) on sapphire (0001) was studied by Å-resolution surface-specific x-ray scattering methods. The monolayer was found to consist of three sublayers where the outermost layer corresponds to vertically oriented, closely packed alkyl tails. Laterally, the monolayer is hexagonally packed and exhibits pseudorotational epitaxy to the sapphire, manifested by a broad scattering peak at zero relative azimuthal rotation, with long powderlike tails. The lattice mismatch of ~1% – 3% to the sapphire’s and the different length scale introduced by the lateral Si-O-Si bonding prohibit positional epitaxy. However, the substrate induces an intriguing increase in the crystalline coherence length of the SAM’s powderlike crystallites when rotationally aligned with the sapphire’s lattice. As a result, the increase correlates well with the rotational dependence of the separation of corresponding substrate-monolayer lattice sites.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704; AC02-76CH0016
OSTI ID:
1182499
Alternate ID(s):
OSTI ID: 1181133
Report Number(s):
BNL-107401-2015-JA; PRLTAO; R&D Project: PO034; KC0203010
Journal Information:
Physical Review Letters, Vol. 113, Issue 15; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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