|
STM images on self-assembled monolayers (SAMs) of 1-octanethiol
(CH3(CH2)7SH) on a gold/mica substrate. As the
sulfur atom binds to the surface it removes gold atoms and single atom deep etch
pits are formed (circles seen in Figure 1).
SAM Molecule Images
The SAM molecules stand up on the surface and are tilted at ~30° to the
surface normal. Boundaries between domains of molecules with different tilt
directions can be seen in Figure 2. Individual molecules are discerned in Figure
3 as well as the characteristic c(4x2) rectangular reconstruction that many
thiol-SAMs adopt.
.jpg)
Figure 1.STM image of self-assembled monolayers (SAMs) of
1-octanethiol (CH3(CH2)7SH) on a gold/mica
substrate - 150nm x 150nm image
.jpg)
Figure 2.STM image of self-assembled monolayers (SAMs) of
1-octanethiol (CH3(CH2)7SH) on a gold/mica
substrate - 32nm x 32nm image
.jpg)
Figure 3.STM image of self-assembled monolayers (SAMs) of
1-octanethiol (CH3(CH2)7SH) on a gold/mica
substrate - 6nm x 6nm image
EasyScan 2 STM
These measurements were made using a EasyScan 2 STM with mechanically cut
Pt-Ir tips. The gold was flame-annealed prior to adsorption of 1-octanethiol
from ethanol solution. Tunneling parameters were 0.02 nA and1 V.
Data courtesy of Erin Iski and Charles Sykes of Tufts University Boston
Source: Nanosurf
For more information on this source please
visit Nanosurf |