Polymerization of Semi-Fluorinated Alkane Thiol Self-Assembled Monolayers Containing Diacetylene Units

Abstract

We report the formation and subsequent topochemical polymerization of semi-fluorinated self-assembled monolayers (SAMs) containing diacetylene groups. The SAMs used were formed via the adsorption of the following derivatives: CF3(CF2)n(CH2)16CtCsCtC(CH2)10SH (n ) 2, 3) and CF3(CF2)n(CH2)11CtCsCt C(CH2)10SH (n ) 9, 12) onto the surface of gold. The polymerization of the monolayers was initiated by UV irradiation and was monitored using resonance Raman spectroscopy. SAMs with short semi-fluorinated portions were found to polymerize more effectively than those with longer portions, indicating that steric factors become important with increasing perfluorinated chain length.

Improved surfaced-enhanced Raman scattering based on electrochemically roughened silver substrates modified through argon plasma treatment

“…The enhancement was strongly correlated with the degree of coalescence of the initially present Ag grains (10-50 nm in size), which led to the formation of 100-300-nm Ag hills in which each Ag grain remained clearly distinguishable. A series of recent publications has dealt with the interaction of different plasmas with selfassembled monolayers (SAMs) [7,[28][29][30][31][32][33][34][35][36]. Terfort and co-workers [37] explored the plasma treatment of SAM-coated gold surfaces with either hydrogen or oxygen plasma, using X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), ellipsometry, and contact angle measurements for surface characterization.…”

Controlling the Properties of Self-Assembled Monolayers by Substrate Curvature

“…The p K a and the redox examples that we discussed lead to two major conclusions: (1) the curvature of nanoscopic supports can perceptibly affect the chemical reactivity within SAMs − and (2) the curvature effects can be predicted quantitatively by relatively simple theoretical models. The key question, however, is whether the curvature−reactivity interplay can have any practical ramifications.…”

Photocatalytic Semiconductors

“…This has produced many works to report a so-called quantum yield evaluated on the basis of the incident light rather than the light actually absorbed by the heterogeneous system (Emeline et al 2000): Sun and Bolton (1996) and Serpone and Salinaro (1999) also suggested the application of an integrating sphere to estimate the fraction of absorbed light and established a standard protocol to approximate the quantum yield of any heterogeneous photoreaction using the photodegradation of phenol over TiO 2 (Degussa P25) as a typical photoreaction based on the concept of a relative photonic efficiency (ξ r ; Eq. 5.44) (Panida et al 2009;Critchley et al 2006;Cheadle et al 2001):…”