Rossier, JoelReymond, FredericGirault, HubertRohner, TatianaLion, NielsGobry, Veronique2015-09-222015-09-222015-09-222002https://infoscience.epfl.ch/handle/20.500.14299/118471The present invention relates to an apparatus and a method of fabricating the apparatus for dispensing a sample for subsequent analysis by mass spectrometry. The apparatus comprises a polymer substrate (1), in which a covered microchannel (3) has been etched, a wall of the microchannel comprising an electrically conductive material (2) for applying a voltage allowing the sample to be sprayed into a mass spectrometer from the open end (4) of the microchannel. The present application also discloses various applications of the apparatus.patentUS7098450DE60204288DE60204288AT296483EP1366506US2004075050EP1366506WO02080222GB01035169908639