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Ionic Liquids Can Permanently Modify Porous Silicon Surface Chemistry
Authors:Dr. Shruti Trivedi  Sidney G. Coombs  Durgesh V. Wagle  Nakara Bhawawet  Prof. Gary A. Baker  Prof. Frank V. Bright
Affiliation:1. Department of Chemistry, SUNY-Buffalo, Buffalo, NY, USA;2. Department of Chemistry, University of Missouri-Columbia, Columbia, MO, USA
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.
Keywords:analytical chemistry  ionic liquids  microarrays  oxidation  porous silicon
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