6533b86dfe1ef96bd12ca8cf

RESEARCH PRODUCT

Nano photoelectron ioniser chip using LaB6 for ambient pressure trace gas detection

Theodor DollUlrich KunzeJürgen SchubertMichael KieschnickK. T. KallisC. M. Zimmer

subject

Atmospheric pressurebusiness.industryDetectorAnalytical chemistryLanthanum hexaboridePhotoelectric effectCondensed Matter PhysicsAtomic and Molecular Physics and OpticsPhotocathodeSurfaces Coatings and FilmsElectronic Optical and Magnetic Materialschemistry.chemical_compoundchemistryNano-OptoelectronicsWork functionElectrical and Electronic EngineeringbusinessAmbient pressure

description

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.

yearjournalcountryeditionlanguage
2012-10-01Microelectronic Engineering
https://doi.org/10.1016/j.mee.2012.07.094