title: Guided assembly of metal and hybrid conductive probes using floating potential dielectrophoresis.
abstract: We present the site-selective, parallel and reproducible formation of conductive gold and tetrathiafulvalene-gold (TTF-Au) hybrid micro- and nanowires from their respective ion salt and cation-radical solutions. While the formation of micro- and nanowires by means of dielectrophoresis with directly coupled electrodes has been thoroughly investigated in recent studies, we present here the first relevant example of metal and hybrid wire assembly obtained by floating potential dielectrophoresis. In this configuration, the assembly of micro- and nanowires is achieved by capacitively coupling a large electrode (bias electrode) to a conductive substrate (p-doped Si) separated by an insulating oxide layer. In contrast to former studies, this allows parallel production of micro- and nanowires with only one pair of electrodes connected to a sine wave generator. We further demonstrate that these structures are suitable probes for localized surface enhanced Raman spectroscopy (SERS).
authors.affiliation: Department of Chemistry and Applied Biosciences, ETH Zürich, 8093, Zürich, Switzerland. puigmarti.luis@org.chem.ethz.ch
authors.forename: Josep
authors.initials: J
authors.lastname: Puigmartí-Luis
authors.forename: Johannes
authors.initials: J
authors.lastname: Stadler
authors.forename: Daniel
authors.initials: D
authors.lastname: Schaffhauser
authors.forename: Angel Pérez
authors.initials: AP
authors.lastname: del Pino
authors.forename: Brian R
authors.initials: BR
authors.lastname: Burg
authors.forename: Petra S
authors.initials: PS
authors.lastname: Dittrich
mesh_terms: D003460:Crystallization / Q000379:methods; D004553:Electric Conductivity; D004566:Electrodes; D004586:Electrophoresis / Q000379:methods; D004595:Electroplating / Q000379:methods*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006046:Gold / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation; D010316:Particle Size; D013059:Spectrum Analysis, Raman / Q000295:instrumentation*; D013499:Surface Properties; D014159:Transducers
chemical_list: D046911:Macromolecular Substances; D006046:Gold