On the stability of carboxylic acid-terminated self-assembled monolayers: Influence of varying alkyl chain length
(English)Manuscript (preprint) (Other academic)
The physio-chemical properties and storage stability of three carboxyl-terminated selfassembled monolayers (SAMs), prepared from ethanolic and acidified ethanolic thiolssolutions of HS-(CH2)nCONH-EG6CH2-COOH, n=3, 11 or 15 on gold, have been correlated to their performance as potential biosensor surfaces. The SAMs of the two longer thiols (n=11, 15) prepared from acidified thiol solutions displayed highly organized and crystallinelike alkyl and ethylene glycol portions. The length of the supporting alkyl chain also influenced the storage stability of the SAMs in nitrogen gas, water and acidified water/ethanol solutions. The two long alkyl chain SAMs exhibited excellent storage characteristics, whereas the short chain thiol resulted in a less storage stable SAM as revealed by increased molecular decomposition and desorption, and a significantly reduced biofunctionality.
IdentifiersURN: urn:nbn:se:liu:diva-19692OAI: oai:DiVA.org:liu-19692DiVA: diva2:227492