Open AccessMeasuring the activation energy of thiol desorption using lateral force microscopy
Author(s) -
Liao YenChih,
Sun Huizhong,
Weeks Brandon L.
Publication year - 2011
Publication title -
scanning
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.359
H-Index - 47
eISSN - 1932-8745
pISSN - 0161-0457
DOI - 10.1002/sca.20293
Subject(s) - desorption , monolayer , activation energy , thiol , atomic force microscopy , thermal desorption , kinetic energy , kelvin probe force microscope , signal (programming language) , chemistry , thermal stability , analytical chemistry (journal) , scanning force microscopy , thermal desorption spectroscopy , nanotechnology , materials science , adsorption , organic chemistry , physics , quantum mechanics , computer science , programming language
Thermal stability of self‐assembled monolayers (SAMs) is important for applications in various surface science applications. As a model material, 16‐mercaptohexadecanoic acid (MHA) on template stripped gold surfaces was investigated to determine the effect of temperature on the change of lateral force signal using atomic force microscopy (AFM). Friction force signals were obtained at various temperatures in order to determine whether it was possible to correlate the friction signal with desorption of the thiol molecule from the surface. Samples were heated for up to 10 h ranging from 40 to 80°C in air and scanned every hour. A kinetic model was introduced to correlate the lateral force signal to the activation energy of desorption of the SAM from gold surface with heating. The activation energy of the detachment using this technique is 25.4 kcal/mol, which is consistent with other more complex techniques. SCANNING 34: 200–205, 2012. © 2011 Wiley Periodicals, Inc.