%A Oleksandr Kuzmych Kuzmych
%T Detection of Nitric Oxide usingCarbon Nanotube Field-Effect Transistors
%X A new method for detection of nitric oxide in gas phase is based on acombination of catalytic conversion and conductivity measurements using achemically functionalized carbon nanotube field-effect transistor (NTFET) device.Gas mixtures containing nitric oxide (NO) are passed through a catalytic converter(CrO3) which converts NO into nitrogen dioxide (NO2). The latter is delivered tothe surface of the NTFET sensor coated with poly(ethylene imine) (PEI).Interaction of the gas with a chemically functionalized NTFET results in aconductivity change that is proportional to the NO gas concentration. The widerange of NO gas concentrations from approximately 2 ppb to 5 ppm was tested. Thedetection limit of NO has been measured as 5ppb (S/N=3) in inert atmosphere at afixed relative humidity (30%). Cross sensitivity to carbon dioxide and oxygen wasmeasured in the gas mixture, modeling human breath conditions. If CO2 is removedby means of an ascarite trap, the new method offers the advantage of low cost,compact size and simplicity of set up.
%D 2007
%K asthma; Carbon nanotubes; detection; nitric oxide; oxidation
%I University of Pittsburgh
%L pittir7324