Prospecting for Gold: Self-Assembly on Old CDs
Dinah M Soolaman, Hua-Zhong Yu,
Gold is one of the most widely used substrate materials for self-assembly. Self-assembled monolayers (SAMs) prepared from alkanethiols and their derivatives on gold are the most reliable and well-studied systems to date, which have attracted much attention because of interest in two-dimensional molecular assemblies, and because of their potential applications in molecular devices, sensors, and functionalized interfaces. Gold electrodes are also of great importance in microelectronics and electroanalytical chemistry. This work reports the characterization of a new type of gold substrates for self-assembly. The gold substrates are constructed from recordable compact disks (R-CDs) with simple and straightforward wet-chemical treatment, and can be made at desired sizes and shapes that satisfy different experimental needs. In particular, we have established an easy, inexpensive, and reproducible method to prepare self-assembled monolayers (SAMs) on CD-R gold substrates after removing the protective polymer films with concentrated nitric acid. As an extension, we demonstrated that CD-R gold films are ideal as micro-patterned conductive substrates for the "customized" fabrication of material microstructures. We are also working on the immobilization of biomacromolecules on CD-R substrates, and exploring the possibility to use CD-R writing and reading technology for surface modulation and detection.
Recordable CDs, Thiols, Gold, Monolayer, electrodeposition