According to literature, MWCNTs act as p type semiconductor in H2 sensor, but when p-type nanoparticles attached on these it behaves more like p-type.
http://ac.els-cdn.com/S0925400513013476/1-s2.0-S0925400513013476-main.pdf?_tid=3915bf6a-d040-11e3-a0a0-00000aacb35f&acdnat=1398846180_c9e1b04935fe848fdd4eb7c074063039
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