Microstructured tungsten oxide (WO3) fabricated by laser-irradiating tungsten foil in methanol has been developed as a substrate to soft-ionize small-molecular-weight compounds by surface-assisted laser desorption/ionization mass spectrometry. The material can be used to detect a wide variety of low molecular weight polar analytes in their protonated and deprotonated forms and non-polar species as radical cations.
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