Papers

Peer-reviewed
Jun, 2016

Fabrication and Characterization of Cross-Linked Organic Thin Films with Nonlinear Mass Densities

LANGMUIR
  • Md. A. Rashed
  • ,
  • Salinthip Laokroekkiat
  • ,
  • Mitsuo Hara
  • ,
  • Shusaku Nagano
  • ,
  • Yuki Nagao

Volume
32
Number
23
First page
5917
Last page
5924
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1021/acs.langmuir.6b00540
Publisher
AMER CHEMICAL SOC

The preparation of urea (bonded) cross-linked multilayer thin films by sequential deposition of bifunctional and tetrafunctional molecular building blocks is demonstrated. Multilayer growth as a. function of deposition cycles was inspected using UV-Vis absorption spectroscopy.. From infrared results, three characteristic infrared bands of amide I, amide II, and asymmetric v(a)(N-C-N) strtching confirmed the formation of polyurea networks by alternate dipping into solutions of amine and isocyanate functionality monomers. The deconvoluted component of the C is and N is spectra obtained by X-ray photoelectron spctroscopy shows clear evidence of stable polyurea networks. The enhancement of structural periodicity with film growth was demonstrated by grazing incidence small-angle X-ray scattering 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 up to 16% within deposited layers from proximate layers to those extending away from the substrate surface. This difference in the packing density might derive from the different degrees of cross-linking among layers proximate to the substrate surface and extending away from the substrate surface.

Link information
DOI
https://doi.org/10.1021/acs.langmuir.6b00540
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000378016600024&DestApp=WOS_CPL
ID information
  • DOI : 10.1021/acs.langmuir.6b00540
  • ISSN : 0743-7463
  • Web of Science ID : WOS:000378016600024

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