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SAM is a thermodynamically stable ordered thin film with the lowest energy, which is based on the strong chemical bonding of long-chain organic molecules on the surface of the substrate and the spontaneous adsorption of organic molecules on the solid/liquid or gas/solid interface [3]. The molecules that make up the monolayer are oriented, orderly and closely arranged, and the structure and properties of the monolayer can be controlled and adjusted by changing the head and tail groups of the molecules and the type and length of the chain. Therefore, SAM has become an ideal model system to study various complex interface phenomena, such as membrane permeability, friction, wear, wetting, adhesion, corrosion, biological fermentation, surface charge distribution and electron transfer theory. The electrochemistry of self-assembled films mainly studies the absolute coverage, defect distribution, thickness, ion permeability, surface potential distribution and electron transfer of self-assembled films by electrochemical methods. SAM can be used to study the trans-SAM electron transfer between redox species in solution and electrode, and the electron transfer between electroactive SAM itself and electrode. The self-assembled film formed by thiol compounds on the surface of gold electrode is the most typical and studied system in membrane electrochemistry.

Self-assembled monolayer

The following article will introduce SAMs in detail.

http://www . chem . wisc . edu/areas/organic/studsemin/biddle/biddle-ABS . pdf