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A Non‐Covalent Approach for Depositing Spatially Selective Materials on Surfaces
Author(s) -
Chen M.S.,
Brandow S. L.,
Schull T. L.,
Chrisey D. B.,
Dressick W. J.
Publication year - 2005
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200400615
Subject(s) - ligand (biochemistry) , monolayer , materials science , adsorption , covalent bond , reactivity (psychology) , aqueous solution , metal , chemical engineering , nanotechnology , photochemistry , organic chemistry , chemistry , medicine , biochemistry , receptor , alternative medicine , pathology , engineering , metallurgy
We describe a new method for depositing patterned materials, based on non‐covalent trapping of ligands in solvent‐templated nanocavities created in aromatic, self‐assembled monolayer or polymer films. A model has been developed and tested to describe nanocavity formation and the ligand adsorption process, which occurs via ligand exclusion from ambient, aqueous solution into the hydrophobic nanocavities. Ligand adsorption rates and ligand adsorbate reactivity with solution species are governed by ligand size/geometry design factors identified using the model. Spatial control of adsorption is achieved via film photochemical changes that inhibit subsequent ligand adsorption/accessibility (UV or X‐ray) or displacement of entrapped ligands (50 keV electron‐beam) during film patterning. The reactivity of the adsorbed ligand is illustrated by the selective binding of Pd II species that catalyze electroless metal deposition. Fabrication of high‐resolution (≈ 50 nm), positive‐tone patterns in nickel with acceptable feature‐edge acuity and critical dimension control (≈ 5 %) is demonstrated.