Significant research has focused on understanding and developing porous silicon (pSi) surface chemistry in multidisciplinary areas. A high-throughput screening system has been developed to rapidly create, screen, and assess the efficacy of ionic liquid (IL) features formed on the porous silicon surface. The IL cations include imidazolium, pyrrolidinium, pyridinium, quaternary ammonium, piperidinium, and quaternary phosphonium, whereas anions are hexafluorophosphate, tetrafluoroborate, bis(trifluoromethane sulfonyl)imide, sulfonate, triflate, tetracyanoborate, sulfate, and dicyanamide. IL microarrays were pin-printed on the surface of as-prepared pSi (ap-pSi) using a computer-controlled robotic pin-printer. IL/pSi microarray assessment included multispectral photoluminescence (PL) and infrared (IR) imaging. Results indicate that the hydrophilic ILs (e.g., 1-butyl-3-methylimidazolium tetrafluoroborate [bmim][BF<sub>4</sub>]) serves as a medium to transport water directly into the hydrophobic, ap-pSi matrix where water oxidizes the ap-pSi to form oxidized pSi (ox-pSi), leading to irreversible oxidation of ap-pSi, and hence permanently changing the pSi PL and surface chemistry. In contrast, the hydrophobic ILs (e.g., 1-butyl-3-methylimidazolium hexafluorophosphate [bmim][BF<sub>6</sub>]) do not alter the ap-pSi surface chemistry to a significant extent.

High-throughput screening method for creating and assessing ionic liquid/porous silicon microarrays

251st National Meeting (2016)

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