Effect of humidity and hydrophobicity on the tribological properties of self-assembled monolayers

Yen Chih Liao, William Hargrove, Brandon L. Weeks

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The tribological properties of two distinctive alkanethiol SAMs, 16-mercaptohexadecanoic acid (MHA) and 1-octadecanethiol (ODT), on gold substrates in various humidity conditions were examined by lateral force microscopy (LFM). The results suggest that hydrophobic ODT SAM is insensitive to humidity. The difference of lateral force signal is within ±10% regardless of humidity. The lateral force signal of hydrophilic MHA SAMs has a significant decrease in signal in humid environments. The influence of bulk water was also investigated by LFM. By imaging under water, the capillary force is eliminated on ODT SAMs, which leads to a lower lateral force. However, the lateral force image was reversed on MHA SAMs, which suggested that hydrophobic forces dominated in water.

Original languageEnglish
Article number748295
JournalThe Scientific World Journal
Volume2013
DOIs
StatePublished - 2013

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