title: Bonding self-assembled, compact organophosphonate monolayers to the native oxide surface of silicon.
abstract: A new method is described to prepare strongly bonded, compact monolayer films of alkyl- or arylphosphonates on the native oxide surface of Si (SiO(2)/Si). This method is illustrated for octadecyl- and alpha-quarterthiophene-2-phosphonates. For both cases, AFM shows comprehensive coverage of the SiO(2)/Si surface. The thickness of the continuous film of 4TP/SiO(2)/Si was measured both by AFM and by X-ray reflectivity to be ca. 18 A. Direct gravimetric analysis shows surface coverage by alpha-quarterthiophene-2-phosphonate to be about 0.66 nmol/cm(2), which corresponds to molecular packing in the film close to that of crystalline alpha-quarterthiophene. Coverage by octadecylphosphonate was ca. 0.90 nmol/cm(2), corresponding to a cross-sectional area of about 18.5 A(2)/molecule, consistent with close-packed alkyl chains.
authors.affiliation: Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009, USA.
authors.forename: Eric L
authors.initials: EL
authors.lastname: Hanson
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Schwartz
authors.forename: Bert
authors.initials: B
authors.lastname: Nickel
authors.forename: Norbert
authors.initials: N
authors.lastname: Koch
authors.forename: Mehmet Fatih
authors.initials: MF
authors.lastname: Danisman