US Patent 7360461 - CNT layer for air transport tubing

http://www.freepatentsonline.com/7360461.html

Some air sampling tubes suffer from the problems of absorption or desorption or volatile organic compounds (VOCs) leading to inaccurate senor results. This patent from Aircuity, Inc. teaches using carbon nanotubes to help prevent these problems. Claim 1 reads:

1. An air sampling system, comprising:

a sensor suite that measures at least one characteristic of an air sample;

air intake valves for switching air samples; and

tubing coupled to the air intake valves and a plurality of termination points from which air samples are obtained and transported via the tubing to the sensor suite,

wherein at least a portion of the tubing includes an electrically conductive inner layer having carbon nanotubes in a host material, wherein the combination of the host material and the carbon nanotubes minimizes absorption, desorption and off-gassing for the air samples.