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pp.192-197
Carbon nanotubes (CNT) were used as a catalyst support where catalytically active Pd and Pt metalparticles decorated the outside of the external CNT walls. In this study, Pd and Pt nanoparticles supportedon HNO3-treated CNT were prepared by microwave-assisted heating of the polyol process using PdCl2 andH2PtCl6•6H2O precursors, respectively, and were then characterized by SEM, TEM, and Raman. Ramanspectroscopy showed that the acid treated CNT had a higher intensity ratio of ID/IG compared to that of non-treated CNT, indicating the formation of defects or functional groups on CNT after chemical oxidation.Microwave irradiation for total two minutes resulted in the formation of Pd and Pt nanoparticles on the acidtreated CNT. The sizes of Pd and Pt nanoparticles were found to be less than 10nm and 3nm, respectively.Furthermore, the SnO2 films doped with CNT decorated by Pd and Pt nanoparticles were prepared, and thenthe NO2 gas response of these sensor films was evaluated under 1~5ppm NO2 concentration at 200oC. It wasfound that the sensing property of the SnO2 film sensor on NO2 gas was greatly improved by the addition ofCNT-supported Pd and Pt nanoparticles.
