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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/14268

Title: Fabrication and Characterization of Cross-linked Organic Thin Films with Nonlinear Mass Densities
Authors: Rashed, Md. A
Laokroekkiat, Salinthip
Hara, Mitsuo
Nagano, Shusaku
Nagao, Yuki
Keywords: molecular layer deposition
covalent bond
multilayer films
Issue Date: 2016-05-13
Publisher: American Chemical Society
Magazine name: Langmuir
Volume: 32
Number: 23
Start page: 5917
End page: 5924
DOI: 10.1021/acs.langmuir.6b00540
Abstract: Urea (bonded) cross-linked multilayer thin film by sequential deposition of bifunctional and tetrafunctional molecular building blocks was demonstrated. Multilayer growth as a function of deposition cycles was inspected using UV-vis absorption spectroscopy. From IR results, three characteristic infrared bands of amide I, amide II, and asymmetric ν_a (N-C-N) stretching band confirmed the formation of polyurea networks by alternate dipping into solutions of amine and isocyanate functionalities monomers. The deconvoluted component from the C 1s and N 1s spectra from X-ray photoelectron spectroscopy (XPS) shows clear evidence of stable polyurea networks. Enhancement of structural periodicity with film growth was demonstrated by grazing incidence small angle X-ray scattering (GI-SAXS) measurements. The thin film near the substrate surface seems to have an amorphous structure. However, molecular ordering improves in the surface normal direction of the substrate with a certain number of deposited layers. Constant mass density was not observed with deposition cycles. The mass density increased upto 16% within deposited layers from proximate layers to those extending away from the substrate surface. This difference in packing density might derive from the different degrees of cross-linking among layers proximate to the substrate surface and extending away from the surface.
Rights: Md. A. Rashed, Salinthip Laokroekkiat, Mitsuo Hara, Shusaku Nagano and Yuki Nagao, Langmuir, 2016, 32(23), pp.5917-5924. This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in Langmuir, copyright (c) American Chemical Society after peer review. To access the final edited and published work, see http://dx.doi.org/10.1021/acs.langmuir.6b00540
URI: http://hdl.handle.net/10119/14268
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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