title: Selective electroless deposition of metal clusters on solid-supported bacteriorhodopsin: applications to orientation labeling and electrical contacts.
abstract: Controlling the orientation of bacteriorhodopsin (bR) monolayers is an important step in studying and utilizing such membranes in a solid-state configuration in, for example, photoelectric applications. Macroscopic monolayers of bR have been fabricated in a variety of ways, but characterization of the distribution of the two possible orientations in which the membrane fragments can adsorb has not yet been addressed experimentally. Here, an approach is presented that labels only one of the membrane surfaces by electroless growth of metal nanoparticles on top of the solid-supported membranes. In this way, it is possible to observe which surface of the membranes is actually adsorbed to the substrate. How this technique serves to interface the membranes with a top metal contact for further electrical measurements is also demonstrated.
authors.affiliation: Department of Materials and Interfaces, Weizmann Institute of Science, P. O. Box 26, Rehovot 76100, Israel.
authors.forename: Izhar
authors.initials: I
authors.lastname: Ron
authors.forename: Noga
authors.initials: N
authors.lastname: Friedman
authors.forename: David
authors.initials: D
authors.lastname: Cahen
authors.forename: Mordechai
authors.initials: M
authors.lastname: Sheves
mesh_terms: D001436:Bacteriorhodopsins / Q000737:chemistry*; D008566:Membranes / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D008855:Microscopy, Electron, Scanning; D010984:Platinum / Q000737:chemistry; D012834:Silver / Q000737:chemistry
chemical_list: D012834:Silver; D010984:Platinum; D001436:Bacteriorhodopsins