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

• Rashed, Md. A

• Laokroekkiat, Salinthip

• Hara, Mitsuo

• Nagano, Shusaku

• Nagao, Yuki

抄録

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.

identifier:https://dspace.jaist.ac.jp/dspace/handle/10119/14268

収録刊行物

• Langmuir

  Langmuir 32 (23), 5917-5924, 2016-05-13

  American Chemical Society

キーワード

• molecular layer deposition
• covalent bond
• multilayer films
• polyurea
• layer-by-layer

詳細情報

• CRID: 1050564287491939328
• NII論文ID: 120006312302
• ISSN: 07437463
• Web Site: http://hdl.handle.net/10119/14268
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles