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Vapor Deposition Method
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Overview
Deposition is a method for forming a thin metal film on the surface of the substrate. In this project, Gold and Chromium were deposited on the polystyrene beads in order to conjugate specific DNA onto the determined location on the surface.
Vapor Deposition Method
1st Deposition
- First, we deposit gold on the polystyrene beads in order to make gold hemisphered body.
2nd Deposition
- Next, we change the direction of beads, and deposit chromium on the body.
- Then we pick up polystyrene-bead, which are deposited by quarter gold and half chromium.
- By chromium capping, this "head part" is prevented to conjyugate DNA strands, so platinum only mounted at the rear.
After PVD
- Through twice of physical vapor deposition,
- we conjugate thiol modified DNA onto gold part.
- we conjugate amino modified DNA onto polystyrene part.
- There are no DNA staple strands on chromium hemisphere.
- Therefore, platinum particles can't conjugate onto chromium hemisphere.
- As a result, JET starts to move toward chromium hemisphere heading.
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