Self-assembled multilayers of .omega.-mercaptoalkanoic acids: selective ionic interactions

Arrays of Cu2+-complexed organic clusters grown on gold nano dots

“…Coordinated metal ion-organic multilayers [14][15][16][17][18] were adsorbed on the metal dots, by alternate deposition of 16-mercaptohexadecanoic acid (SH-(CH 2 ) 15 -COOH, Aldrich), 1 mM in ethanol and Cu 2þ ions (Cu(ClO 4 ) 2 , Aldrich), 1 mM in ethanol [19]. Adsorption times for the organic molecules ranged from 4 h to overnight.…”

“…Here, 10 or 20 such layers (each layer consists of one organic molecule plus one Cu 2þ ion) were adsorbed on different samples (we have successfully used this technique with 3-30 layers in prior work [14]). The linear growth of the layers was verified using ellipsometry: the thickness of each additional layer grown on gold thin films was measured and was identical to all other layers (2.0 AE 0.2 nm) [19]. X-ray photoelectron spectroscopy (XPS) measurements were conducted as an independent characterization technique to verify the organic layer contents.…”

Construction of Various Self-assembled Films and Their Application as Lubricant Coatings

“…Specifically, the attraction between adjacent alkyl chains of normal SAMs is the weak van der Waals force. Within SAMFs, the inter-chain interaction is enhanced by functional groups, such as diacetylene (Mowery et al, 1999), peptide (Clegg & Hutchison, 1996;Sabapathy et al, 1998), and sulfone (Evans et al, 1991). It is hypothesized that the functional groups interact laterally taking the form of hydrogen bonding, dipole interaction, π-stacking, or covalent attachment, which are able to influence the integrity, stability and the tribological performances of the film (Ren et al, 2003;a, Song et al, 2008).…”

Hybrid approaches to nanometer-scale patterning: Exploiting tailored intermolecular interactions

“…One example of this type of hybrid strategy is the molecular-ruler process, where conventional lithography is coupled with selective deposition of multilayers of bifunctional organic molecules and coordinated metal ions. Ultimately, the chemical multilayer film defines the nanometer-scale spacings of the lithographically patterned surface structures (Evans et al 1991;Hatzor and Weiss 2001;Haes et al 2004). Figure 2 shows a schematic of the molecular-ruler assembly process.…”