title: Ionic liquids: nondestructive, nonvolatile imaging fluids for submicrometer-scale monolayer patterns.
abstract: A method for visualizing submicrometer-scale patterns of approximately 1.0-nm-thick monolayers terminated with CF(3) and CH(3) groups using an ionic liquid (IL) is described. Bis(hydroxyethyl)dimethylammonium methanesulfonate (BHDAMS) was spin-cast onto the photolithographically patterned samples. The BHDAMS wetted the photodecomposed regions selectively. Pattern widths of the mask ranged from 500 nm to 10 microm, and the IL-replicated patterns were observed using optical and laser microscopy. The nonvolatile BHDAMS had sufficient contrast to image submicrometer-scale patterns of monolayers over large areas. We note that this imaging technique involves no damage and is compatible with readily available laboratory equipment.
authors.affiliation: National Institute of Advanced Industrial Science & Technology (AIST), Moriyama, Nagoya 463-8560, Japan. a.hozumi@aist.go.jp
authors.forename: Atsushi
authors.initials: A
authors.lastname: Hozumi
authors.forename: Pei
authors.initials: P
authors.lastname: Bien
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: McCarthy
mesh_terms: D052578:Ionic Liquids / Q000737:chemistry*; D008698:Mesylates / Q000737:chemistry; D008853:Microscopy; D055616:Microtechnology; D036103:Nanotechnology; D014835:Volatilization
chemical_list: D052578:Ionic Liquids; D008698:Mesylates