Patterned functionalized silicon surfaces
The present invention provides a method for preparing a silicon substrate and a silicon substrate having a silicon surface comprising a pattern of covalently bound monolayers. Each of the monolayers comprises an alkyne, wherein at least a portion of each monolayer is no more than about 5 molecules of the alkyne wide.
1. A method for forming a covalently bound monolayer of organic substituents on a silicon or germanium substrate having a surface comprising silicon or germanium hydride groups, said method comprising the steps of:
contacting the surface of the substrate with a liquid comprising an optionally substituted C 2 -C 24 alkyne:
positioning a conductor electrode tip in contact with the liquid disposed on the surface of the substrate;
using the conductor electrode tip to apply an electrical potential sufficient to covalently bind at least a portion of the alkyne to the surface; and
moving the tip along the surface to create a pattern of covalently bound alkyne.
2. The method of claim 1 wherein the conductor electrode tip is an atomic force microscope tip.
3. The method of claim 1 wherein the conductor electrode tip is a scanning tunneling microscope tip.
4. The method of claim 1 wherein some portions of the pattern are no more than about 10 molecules thick.
5. The method of claim 1 wherein some portions of the pattern are no more than about 5 molecules thick.
6. The method of claim 1 wherein some portions of the pattern are no more than about 1 moleculethick.