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Atomic Force Microscopy

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Optimized Model Surfaces for Advanced Atomic Force Microscopy Studies of Surface Nanobubbles.

Bo Song^1,2, Yi Zhou^1,2, Holger Schönherr¹

¹Physical Chemistry I, Department of Chemistry and Biology, and Research Center of Micro and Nanochemistry and Engineering (Cμ), University of Siegen , Adolf-Reichwein-Strasse 2, 57076 Siegen, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids

|June 15, 2016

Summary

Self-assembled monolayers (SAMs) of binary mixtures of 16-mercaptohexadecanoic acid and 1-octadecanethiol on gold surfaces do not phase segregate. These functionalized surfaces are valuable for studying surface nanobubbles using atomic force microscopy.

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Area of Science:

Surface science
Nanotechnology
Materials chemistry

Background:

Self-assembled monolayers (SAMs) are crucial for controlling surface properties.
Understanding the assembly behavior of binary SAMs is essential for advanced applications.
Surface nanobubbles are a phenomenon influenced by substrate properties.

Purpose of the Study:

To investigate the formation, composition, and phase segregation of binary SAMs.
To compare SAM formation on ultraflat template-stripped gold (TSG) with conventional gold substrates.
To evaluate the suitability of functionalized TSG for surface nanobubble studies using atomic force microscopy (AFM).

Main Methods:

Quartz crystal microbalance (QCM) and surface plasmon resonance (SPR) for in situ monitoring.
Grazing incidence reflection Fourier transform infrared (GIR FTIR) spectroscopy.
Contact angle measurements analyzed with the Israelachvili-Gee model.
High-resolution friction force atomic force microscopy (AFM).

Main Results:

Binary mixtures of 16-mercaptohexadecanoic acid (MHDA) and 1-octadecanethiol (ODT) form monolayers and bilayers on TSG.
The MHDA bilayer, formed via hydrogen bonding, is removable with water rinsing.
Analysis indicates no lateral phase segregation in the binary SAMs.
AFM confirms this lack of segregation down to the nanometer scale.

Conclusions:

Binary SAMs of MHDA and ODT do not exhibit lateral phase segregation on TSG.
Ultraflat TSG substrates functionalized with these SAMs are suitable for AFM studies of surface nanobubbles.
These substrates enable investigations into the relationship between surface functionality and nanobubble formation.