Download self-assembled monolayers lecture
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• Thickness measurements using ellipsometry yield SAM<br />
thicknesses that are in good agreement with the 30° chain tilt<br />
mentioned above. For example, reported ellipsometric<br />
thicknesses of hexadecanethiolate SAMs lie in the 21±1 Å<br />
range, to compare with the 21.2 Å that result if a fully extended<br />
hexadecanethiol molecule of 24.5 Å length is tilted 30°.<br />
• Contact angle measurements further confirm that alkanethiolate<br />
SAMs are very dense and that the contacting liquid only<br />
interacts with the topmost chemical groups. Reported advancing<br />
contact angles with water range from 111° to 115° for<br />
hexadecanethiolate SAMs. At the other end of the wettability<br />
scale, there are hydrophilic <strong>monolayers</strong>, e.g., SAMs of 16-<br />
mercaptohexadecanol (HS(CH2)16OH), that display water<br />
contact angles of
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