Carbon nanotube based gas sensor arrays on rigid and flexible substrates

We report a highly reproducible Carbon nanotube (CNT) based gas sensor arrays, which are able to discriminate between NH
₃
, CO, CO
₂
and ethanol. Each sensor array is composed of four sensing elements where metallic nanoparticles (NPs) were utilized to alter their response towards the different test gases. Au functionalization was capable to separate NH
₃
from the other gases, while Pd and Cr functionalization distinguished between CO/CO
₂
and NH
₃
/ethanol. We present as well the fabrication of Au functionalized CNT gas sensor array fabricated on flexible substrate (Kapton), which was able to separate NH
₃
from the other test gases.