The functionalized PSi surfaces provides a good alternative for DESI-MS, increasing the sensitivity and improving stability of the signal. This is possible because the weak sample-surface interactions due the hyprophobic characteristic favoring desorption of the analyte. The porosity size of the surface may provide more surface area for interaction between the dried analyte and the thin solvent film created by the DESI spray, resulting in more effective dissolution of the analyte in the spray solvent.
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