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Ionic Liquids Can Permanently Modify Porous Silicon Surface Chemistry
Author(s) -
Trivedi Shruti,
Coombs Sidney G.,
Wagle Durgesh V.,
Bhawawet Nakara,
Baker Gary A.,
Bright Frank V.
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201601839
Subject(s) - ionic liquid , silicon , ionic bonding , porous silicon , chemical engineering , chemistry , contact angle , porosity , solubility , porous medium , inorganic chemistry , materials science , organic chemistry , ion , catalysis , engineering
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.