Superhydrophobic wet sample holders are fabricated directly on silicon substrate using EBL @100 keV) and Inductive Coupled Plasma (ICP) Si etching. We fabricated and tested a superhydrophobic patterned surface entailing an hydrophilic region which leads to pinning of the drop, enabling X-ray beam effortless alignment and measuring in liquid phase. Our technique allows to acquire capillary-free XRF spectra, resulting in a significant fluorescence detection gain, which is particularly interesting for light elements. As an additional advantage – after solvent evaporation – the solute is deposited on a precise spot, greatly increasing its concentration allowing further measurements, such as X-ray microanalysis and X-ray diffraction.
G. Ciasca et al., Microelectronic Engineering 111 (2013) 304–309
Similar samples can be used to self assemble large ordered DNA arrays [G. Ciasca et al., Nanotechnology 24 (2013) 495302]
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