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Depth profiling of APTES self-assembled monolayers using surface-enhanced confocal Raman microspectroscopy.

Yingying Sun1, Masahiro Yanagisawa2, Masahiro Kunimoto2

  • 1Department of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 6, 2017
PubMed
Summary

Surface-enhanced Raman spectroscopy (SERS) with silver nanoparticles precisely analyzed the internal structure of 3-aminopropyltriethoxysilane (APTES) self-assembled monolayers, revealing molecular orientation and interfacial bonds.

Keywords:
APTES self-assembled monolayersDepth profileNano resolutionSurface-enhanced confocal Raman microspectroscopy

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Characterizing the nanometer-level internal structure of self-assembled monolayers (SAMs) like 3-aminopropyltriethoxysilane (APTES) on glass is challenging.
  • Understanding SAM internal structure is crucial for advanced material applications.

Purpose of the Study:

  • To investigate the internal molecular structure of APTES SAMs using advanced spectroscopic techniques.
  • To achieve high-resolution analysis of SAMs, particularly in the vertical direction.

Main Methods:

  • Employed surface-enhanced Raman spectroscopy (SERS) with silver nanoparticles to enhance Raman signals.
  • Utilized density functional theory (DFT) calculations for theoretical support.
  • Implemented a piezoelectric positioner for precise 0.1nm depth-scanning resolution.

Main Results:

  • Successfully measured and distinguished vertical Raman intensity variations for specific APTES groups (Ag/NH2, CH2, SiO).
  • Identified interfacial bonds at the Ag-APTES and APTES-SiO2 interfaces.
  • Demonstrated inhomogeneous APTES molecule orientation through frequency shift analysis.

Conclusions:

  • SERS provides high-resolution insights into the internal structure and interfacial properties of APTES SAMs.
  • The study confirms the utility of SERS for detailed nanoscale surface analysis.
  • Inhomogeneous molecular orientation in APTES SAMs was quantitatively observed.