Abstract
Carbon nanotubes (CNT) were used as a catalyst support where catalytically active Pd and Pt metal particles decorated the outside of the external CNT walls. In this study, Pd and Pt nanoparticles supported on <TEX>$HNO_3$</TEX>-treated CNT were prepared by microwave-assisted heating of the polyol process using <TEX>$PdCl_2$</TEX> and <TEX>$H_2PtCl_6{\codt}6H_2O$</TEX> precursors, respectively, and were then characterized by SEM, TEM, and Raman. Raman spectroscopy showed that the acid treated CNT had a higher intensity ratio of <TEX>$I_D/I_G$</TEX> 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 acid treated CNT. The sizes of Pd and Pt nanoparticles were found to be less than 10 nm and 3 nm, respectively. Furthermore, the <TEX>$SnO_2$</TEX> films doped with CNT decorated by Pd and Pt nanoparticles were prepared, and then the <TEX>$NO_2$</TEX> gas response of these sensor films was evaluated under <TEX>$1{\sim}5\;ppm$</TEX> <TEX>$NO_2$</TEX> concentration at <TEX>$200^{\circ}C$</TEX>. It was found that the sensing property of the <TEX>$SnO_2$</TEX> film sensor on <TEX>$NO_2$</TEX> gas was greatly improved by the addition of CNT-supported Pd and Pt nanoparticles.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
