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http://dx.doi.org/10.3365/KJMM.2010.48.04.342

Effects of Pd Nanoparticles on Single-Walled Carbon Nanotubes as High-Sensitivity Hydrogen Gas Sensors  

Lee, Jun Min (Deartment of Materials Science and Engineering, Yonsei University)
Ju, Seonghwa (Department of Chemistry and Nano Science, Ewha Womans University)
Joe, Jin Hyoun (Deartment of Materials Science and Engineering, Yonsei University)
Kim, Sung-Jin (Department of Chemistry and Nano Science, Ewha Womans University)
Lee, Wooyoung (Deartment of Materials Science and Engineering, Yonsei University)
Publication Information
Korean Journal of Metals and Materials / v.48, no.4, 2010 , pp. 342-346 More about this Journal
Abstract
Pd nanoparticles (NPs) were successfully functionalizedon the surfaces of single-walled carbon nanotubes (SWNTs) by dendrimer-mediated synthesis. The hydrogen sensing properties of the Pd NPs functionalized SWNTs were investigated. Pd NPs-dendrimer-SWNTs sensors show much better speedsand superior recovery rates but lower sensitivity compared to Pd NPs-functionalized SWNTs directly fabricated due to the existence of dendrimers. Pyrolysis of the dendrimers by heat treatment resulted in a fast response time and high sensitivity owing to the reduced length of the dendrimers. These results demonstrate that the heat treatment of dendrimers in Pd NPs-dendrimer-SWNTs sensors can enable significant electrical conductance modulation upon exposure to extremely low concentrations (10 ppm) of hydrogen gas ($H_2$) in air.
Keywords
Carbon and graphite; chemical synthesis; hydrogen; transmission electron microscopy (TEM); hydrogen absorbing materials;
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