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surface-analysis

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Skill for surface composition, chemical state, and topography analysis including XPS depth profiling, AFM imaging, and contact angle measurements

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Source SKILL.md: https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/domains/science/materials-science/skills/surface-analysis/SKILL.md

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Surface Analysis Skill

Purpose

The Surface Analysis skill provides comprehensive capabilities for characterizing material surfaces, enabling detailed analysis of surface composition, chemical bonding states, topography, and interfacial properties critical for understanding surface-sensitive phenomena.

Capabilities

  • XPS depth profiling and chemical state analysis
  • AFM imaging and roughness quantification
  • Contact angle measurement and surface energy calculation
  • Profilometry data analysis
  • Surface contamination identification
  • Tribological surface analysis
  • Coating thickness measurement
  • Adhesion mechanism analysis

Usage Guidelines

X-ray Photoelectron Spectroscopy (XPS)

  1. Survey Spectra

    • Acquire wide scan (0-1200 eV) for elemental identification
    • Identify all elements present above detection limit (~0.1 at%)
    • Note adventitious carbon for charge referencing

  2. High-Resolution Spectra

    • Acquire narrow scans for elements of interest
    • Use appropriate pass energy (20-50 eV typical)
    • Ensure sufficient signal-to-noise for peak fitting

  3. Peak Fitting

    • Apply Shirley or linear background
    • Constrain FWHM and peak shape within physical limits
    • Assign chemical states from binding energy shifts

  4. Depth Profiling

    • Use Ar+ sputtering for inorganic materials
    • Consider cluster ions (Ar-cluster, C60) for organics
    • Monitor for preferential sputtering and mixing

Atomic Force Microscopy (AFM)

  1. Imaging Mode Selection

    • Contact mode: Hard surfaces, atomic resolution
    • Tapping mode: Soft samples, reduced tip wear
    • Non-contact: Minimal surface interaction

  2. Image Analysis

    • Calculate roughness parameters (Ra, RMS, Rmax)
    • Identify surface features and defects
    • Measure step heights and feature dimensions

  3. Force Spectroscopy

    • Acquire force-distance curves
    • Extract adhesion forces
    • Map mechanical properties (modulus, stiffness)

Contact Angle Analysis

  1. Measurement Methods

    • Sessile drop for static contact angle
    • Advancing/receding for dynamic behavior
    • Wilhelmy plate for surface tension

  2. Surface Energy Calculation

    • Owens-Wendt method (dispersive + polar)
    • Van Oss-Chaudhury-Good (acid-base)
    • Use multiple probe liquids (water, diiodomethane, formamide)

  3. Interpretation

    • Hydrophilic: Contact angle < 90 degrees
    • Hydrophobic: Contact angle > 90 degrees
    • Superhydrophobic: Contact angle > 150 degrees

Process Integration

  • MS-003: Spectroscopic Analysis Suite
  • MS-015: Thin Film Deposition Protocol

Input Schema

{
  "sample_id": "string",
  "technique": "XPS|AFM|contact_angle|profilometry",
  "analysis_type": "survey|depth_profile|imaging|force_spectroscopy|wettability",
  "parameters": {
    "scan_area": "number (um x um for AFM)",
    "sputter_depth": "number (nm for XPS)",
    "probe_liquids": ["string (for contact angle)"]
  }
}

Output Schema

{
  "sample_id": "string",
  "xps_results": {
    "elemental_composition": [
      {
        "element": "string",
        "concentration": "number (at%)",
        "chemical_states": [
          {
            "state": "string",
            "binding_energy": "number (eV)",
            "fraction": "number (percent)"
          }
        ]
      }
    ],
    "depth_profile": {
      "depth": ["number (nm)"],
      "composition": {}
    }
  },
  "afm_results": {
    "roughness": {
      "Ra": "number (nm)",
      "RMS": "number (nm)",
      "Rmax": "number (nm)"
    },
    "features": ["string"]
  },
  "surface_energy": {
    "total": "number (mJ/m2)",
    "dispersive": "number (mJ/m2)",
    "polar": "number (mJ/m2)"
  }
}

Best Practices

  1. Clean samples appropriately before analysis (solvent, plasma)
  2. Use charge neutralization for insulating samples in XPS
  3. Reference XPS binding energies to C 1s at 284.8 eV
  4. Calibrate AFM z-scale with step height standards
  5. Use fresh probe liquids for contact angle measurements
  6. Report measurement conditions and uncertainties

Integration Points

  • Connects with Spectroscopy Analysis for complementary chemical information
  • Feeds into Thin Film Deposition for process monitoring
  • Supports Failure Analysis for surface contamination identification
  • Integrates with Corrosion Assessment for passive layer analysis