Surface immobilized biochemical macromolecules studied by scanning Kelvin microprobe

Area of Science:

• Surface science
• Analytical chemistry
• Biophysics

Background:

• Work function measurement is crucial for surface characterization due to its sensitivity to interfacial properties.
• Surface analysis techniques are vital for monitoring chemical modifications, especially at interfaces where new molecules are immobilized.
• Understanding surface chemistry is key in fields like biocompatibility and microarray development.

Purpose of the Study:

• To introduce a novel, modified scanning Kelvin microprobe for advanced surface analysis.
• To demonstrate the instrument's capability for simultaneous measurement of contact potential and surface topography.
• To explore the application of this technique in studying biochemically modified surfaces.

Main Methods:

• Utilized a modified scanning Kelvin microprobe for high-resolution surface analysis.
• Performed tandem measurements of contact potential (resolution 1 mV) and surface topography (resolution 10 nm).
• Achieved a lateral resolution of 1 micron for detailed surface mapping.

Main Results:

• The developed microprobe successfully performed simultaneous measurements of contact potential and surface topography.
• Demonstrated high sensitivity and resolution for characterizing surface properties.
• Applied the technique to study substrates modified with biomacromolecules, including oligonucleotides and DNA.

Conclusions:

• The modified scanning Kelvin microprobe offers a powerful tool for surface characterization.
• The technique shows great potential for studying biocompatibility and macromolecular structures.
• This method is promising for the development and analysis of microarray devices.