소개글
[고체화학] 자가조립 단분자막(self-assembled monolayer)에 대한 자료입니다.
목차
1. Self assembled monolayer
2. Theoretical background
3. Other students’ achievements
본문내용
Please don’t be stressed with it.
This is VERY easy as a LEGO block.
3D model for
Self assembled monolayer
Hydrophobic tail bounce out water drops!
Ultra- hydrophobic thin film
- prevent contamination on windows
- prevent water vapor contacts to micro circuits
- used for scientific experiments
Importance of SAM
provides unique functionality to other scientific region (Specialty coatings, Bio-chemistry, etc,.)
Two important force makes uniform deposition.
head to substrate : Ionic bonding (strong, long-range)
tail to tail : Vans der waals bonding (weak, short-range)
Selection of substrates and head molecule is important
clean substrates (without defects) will help to create good SAM products.
4. Patterning is also possible via various methods.
The origin of the S-Au(111) bond and the binding site preference are discussed from the viewpoint of orbital interaction.
The site preference is in the order of three-fold hollow (fcc and hcp) > bridge > on-top. The second layer Au atoms have little influence on the S-Au(111) bonding, and adsorptions to the fcc and hcp sites are almost identical with respect to energy and S-Au bonding nature.
Although σ-type S-Au orbital interactions dominate the S-Au(111) bonding in the on-top model, π-type S-Au orbital interactions play an important role in the bridge, fcc, and hep models.