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Miniaturized gas ionization sensors using carbon nanotubes
 

Summary: ..............................................................
Miniaturized gas ionization sensors
using carbon nanotubes
Ashish Modi*, Nikhil Koratkar*, Eric Lass, Bingqing Wei
& Pulickel M. Ajayan
* Department of Mechanical, Aerospace and Nuclear Engineering, and
Department of Materials Science and Engineering, Rensselaer Polytechnic
Institute, Troy, New York 12180, USA
.............................................................................................................................................................................
Gas sensors operate by a variety of fundamentally different
mechanisms114
. Ionization sensors1314
work by fingerprinting
the ionization characteristics of distinct gases, but they are
limited by their huge, bulky architecture, high power consump-
tion and risky high-voltage operation. Here we report the
fabrication and successful testing of ionization microsensors
featuring the electrical breakdown of a range of gases and
gas mixtures at carbon nanotube tips. The sharp tips of nano-
tubes generate very high electric fields at relatively low voltages,

  

Source: Ajayan, Pulickel M. - Department of Mechanical Engineering and Materials Science, Rice University

 

Collections: Materials Science