Ionic Liquids Can Permanently Modify Porous Silicon Surface Chemistry.

Authors :: Trivedi S
Coombs SG
Wagle DV
Bhawawet N
Baker GA
Bright FV
Source :: Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2016 Aug 08; Vol. 22 (33), pp. 11677-84. Date of Electronic Publication: 2016 Jul 12.
Publication Year :: 2016
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.<br /> (© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)