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Ionic Liquids Can Permanently Modify Porous Silicon Surface Chemistry
Shruti Trivedi1, Sidney G Coombs1, Durgesh V Wagle2
1Department of Chemistry, SUNY-Buffalo, Buffalo, NY, 14260-3000, USA.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 13, 2016
Summary
Hydrophilic ionic liquids (ILs) heavily oxidize porous silicon (pSi) due to residual water, while hydrophobic ILs cause only slight oxidation. This impacts the development of IL/pSi microarrays.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Ionic liquids (ILs) are versatile solvents with tunable properties.
- Porous silicon (pSi) is a promising material for microarrays and sensors.
- Understanding IL-pSi interactions is crucial for developing advanced materials.
Purpose of the Study:
- To develop ionic liquid/porous silicon (IL/pSi) microarrays.
- To investigate the effect of different ILs on pSi surface chemistry.
- To determine the impact of IL properties on pSi oxidation.
Main Methods:
- Contact pin-printing of 20 hydrophobic and hydrophilic ILs onto as-prepared, hydrogen-passivated pSi (ap-pSi).
- Analysis of IL spot size, shape, and associated pSi surface chemistry.
- Characterization of pSi oxidation levels based on IL properties.
Main Results:
- Hydrophobic ILs caused slight oxidation of ap-pSi.
- Hydrophilic ILs led to heavily oxidized pSi (ox-pSi).
- Residual water in hydrophilic ILs was identified as the cause of significant pSi oxidation.
Conclusions:
- The water content in ILs significantly influences their interaction with pSi.
- Hydrophilic ILs are not ideal for direct use on ap-pSi due to severe oxidation.
- Careful selection of ILs is necessary for fabricating stable IL/pSi microarrays.
