Helium Detection via Field Ionization from Carbon Nanotubes
2003; American Chemical Society; Volume: 3; Issue: 10 Linguagem: Inglês
10.1021/nl034460c
ISSN1530-6992
AutoresD. Riley, Mark Mann, Donald A. MacLaren, Paul C. Dastoor, W. Allison, Kenneth B. K. Teo, G.A.J. Amaratunga, W. I. Milne,
Tópico(s)Graphene research and applications
ResumoA novel, high-efficiency detector for neutral atoms such as helium is described. The design uses multiwalled carbon nanotubes (MWNTs), grown by chemical vapor deposition on a steel support wire. Application of a positive bias to the MWNTs generates electric fields sufficient to field-ionize passing gas-phase atoms. Under ultrahigh vacuum conditions, the detector was demonstrated to be capable of ionising and detecting even helium gas, the element with the highest ionization potential.
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