Abstract
Steam purified, carboxylic and ester functionalized single-walled carbon nanotube(SWNT) and multi-walled carbon nanotube (MWNT) films with homogeneousdistribution and flexible control of thickness and area were fabricated on polymeric andmetallic substrates using a modified spray deposition technique. By employing apre-sprayed polyelectrolyte, the adhesion of the carbon nanotube (CNT) films to thesubstrates was significantly enhanced by electrostatic interaction. Carboxylic and esterfunctionalization improved electrochemical performance when immersed in 0.1 MH2SO4 and the specific capacitance reached 155 and77 F g−1 for carboxylic functionalized SWNT and MWNT films respectively. Compared withexisting techniques such as hot pressing, vacuum filtration and dip coating, the ambientpressure spray deposition technique is suggested as particularly well suited for preparingCNT films at large scale for applications including providing electrodes for electrochemicalsupercapacitors and paper batteries.
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