Abstract: The invention relates to an electrospray emitter (1′; 1″; 1′″), comprising an essentially tubular member (2; 5; 7) having an inlet end and an outlet end. There is provided a spray aperture (4) in the outlet end, having an inner diameter suitable for the generation of electrospray usable in mass spectrometry. At least a surface portion of the emitter comprises a conductive polymer composition that is stable in conditions prevailing during electrospray.