Formentín Pilar, Marsal Lluís F
Departament d'Enginyeria Electrònica, Elèctrica i Automàtica, Universitat Rovira i Virgili, Avinguda Països Catalans, 26 43007 Tarragona, Spain.
Nanomaterials (Basel). 2021 Mar 9;11(3):670. doi: 10.3390/nano11030670.
The effect of the morphology and chemical composition of a surface on the wettability of porous silicon structures is analyzed in the present work. Hydrophobic and superhydrophobic macroporous substrates are attractive for different potential applications. Herein, different hydrophobic macroporous silicon structures were fabricated by the chemical etching of p-type silicon wafers in a solution based on hydrofluoric acid and coated with a fluoro silane self-assembled monolayer. The surface morphology of the final substrate was characterized using a scanning electron microscope. The wettability was assessed from contact angle measurements using water and organic solvents that present low surface energy. The experimental data were compared with the classical wetting states theoretical models described in the literature. Perfluoro-silane functionalized macroporous silicon surfaces presented systematically higher contact angles than untreated silicon substrates. The influence of porosity on the surface wettability of macoporous silicon structures has been established. These results suggest that the combination of etching conditions with a surface chemistry modification could lead to hydrophobic/oleophilic or superhydrophobic/oleophobic structures.
本文分析了表面的形态和化学成分对多孔硅结构润湿性的影响。疏水和超疏水大孔衬底在不同的潜在应用中具有吸引力。在此，通过在基于氢氟酸的溶液中对p型硅片进行化学蚀刻，制备了不同的疏水大孔硅结构，并涂覆了氟硅烷自组装单分子层。使用扫描电子显微镜对最终衬底的表面形态进行了表征。通过使用水和具有低表面能的有机溶剂进行接触角测量来评估润湿性。将实验数据与文献中描述的经典润湿状态理论模型进行了比较。全氟硅烷功能化的大孔硅表面的接触角系统地高于未处理的硅衬底。已经确定了孔隙率对大孔硅结构表面润湿性的影响。这些结果表明，蚀刻条件与表面化学改性的结合可以导致疏水/亲油或超疏水/疏油结构。
