title: Ionic Liquids Can Permanently Modify Porous Silicon Surface Chemistry.
abstract: To develop ionic liquid/porous silicon (IL/pSi) microarrays we have contact pin-printed 20 hydrophobic and hydrophilic ionic liquids onto as-prepared, hydrogen-passivated porous silicon (ap-pSi) and then determined the individual IL spot size, shape and associated pSi surface chemistry. The results reveal that the hydrophobic ionic liquids oxidize the ap-pSi slightly. In contrast, the hydrophilic ionic liquids lead to heavily oxidized pSi (i.e., ox-pSi). The strong oxidation arises from residual water within the hydrophilic ILs that is delivered from these ILs into the ap-pSi matrix causing oxidation. This phenomenon is less of an issue in the hydrophobic ILs because their water solubility is substantially lower.
authors.affiliation: Department of Chemistry, SUNY-Buffalo, Buffalo, NY, 14260-3000, USA.
authors.forename: Shruti
authors.initials: S
authors.lastname: Trivedi
authors.affiliation: Department of Chemistry, SUNY-Buffalo, Buffalo, NY, 14260-3000, USA.
authors.forename: Sidney G
authors.initials: SG
authors.lastname: Coombs
authors.affiliation: Department of Chemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA.
authors.forename: Durgesh V
authors.initials: DV
authors.lastname: Wagle
authors.affiliation: Department of Chemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA.
authors.forename: Nakara
authors.initials: N
authors.lastname: Bhawawet
authors.affiliation: Department of Chemistry, University of Missouri-Columbia, Columbia, MO, 65211, USA.
authors.forename: Gary A
authors.initials: GA
authors.lastname: Baker
authors.affiliation: Department of Chemistry, SUNY-Buffalo, Buffalo, NY, 14260-3000, USA. chefvb@buffalo.edu.
authors.forename: Frank V
authors.initials: FV
authors.lastname: Bright
keywords: analytical chemistry; ionic liquids; microarrays; oxidation; porous silicon