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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Understanding the surface and subsurface composition of amorphous carbon nitride (DLC:N) films is crucial for predicting their interactions.
  • Pulsed laser deposition (PLD) is a common method for creating diamond-like carbon (DLC) films, often modified with nitrogen.
  • Non-destructive analysis techniques are needed to probe these complex materials without altering their structure.

Purpose of the Study:

  • To quantitatively determine the composition and atomic bonding of air-exposed amorphous carbon nitride films.
  • To investigate the non-destructive, in-depth variations from the surface to the shallow subsurface region.
  • To correlate these variations with the material's properties and interactions with its surroundings.

Main Methods:

  • Application of angle-resolved X-ray photoelectron spectroscopy (ARXPS).
  • Utilizing the maximum entropy method for data analysis.
  • Analysis of amorphous carbon nitride films deposited by pulsed laser deposition and modified by nitrogen ion bombardment.

Main Results:

  • Significant variations in composition, chemical bonding, and mass density were observed from the top surface to the shallow subsurface (∼1 nm).
  • The top ∼1 nm layer is rich in oxygen, nitrogen, hydrogen, and predominantly sp2-hybridized carbon.
  • Deeper regions show an increase in sp3-hybridized carbon, a decrease in nitrogen to a minimum, followed by saturation, with distinct trigonal and tetragonal carbon distributions.

Conclusions:

  • The surface properties of DLC:N films are significantly influenced by the abundance of sp2-bonded carbon near the surface.
  • These findings provide a deeper understanding of DLC:N layer surface interactions, relevant for applications involving biological tissues.
  • The study highlights the importance of depth-resolved analysis for characterizing complex thin films.