Abstract
► We developed an ioniser chip for the detection of volatile organic compounds. ► Ioniser chip bases on the emission and defined acceleration of photoelectrons. ► Due to its good work function, LaB 6 is suitable as a photo emitter material. ► Photoelectric current of some picoamperes is achieved by using low-energy UV LED. ► Chip detects gas with IP over 10.6 eV by the energy adjustability of photoelectrons. A detector including a nanoscaled ioniser chip that surmounts the limitation of conventional photo ionisation detectors is presented. Here, ionisable gaseous substances can be detected by photoelectrons accelerated to the ionisation potential of the incoming gaseous molecules. Thin lanthanum hexaboride (LaB 6 ) films deposited by pulsed laser technique (PLD) serve as the air stable photocathode material representing the basis of the ioniser chip of the detector. Besides the analysis of the emission behaviour of the photocathode in vacuum and at atmospheric pressure, the detection of different volatile alcohols using the detector with a low-energy UV LED instead of a PID (VUV photon source) was also performed successfully.
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