<abstract abstract-type="toc"> <title> <x xml:space="preserve">Abstract</x> </title> <p> <graphic position="anchor" id="ga" xlink:href="ark:/27927/pgj2b3173cs" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" />TPD profile of various MWCNTs samples before and after air plasma treatment: (a) CO<sub>2</sub> evolution, (b) CO evolution.</p> </abstract>