| Title |
Effects of Pd Nanoparticles on Single-Walled Carbon Nanotubes as High-Sensitivity Hydrogen Gas Sensors |
| Authors |
이준민(Jun Min Lee); 주성화(Seong Hwa Ju); 조진현(Jin Hyoun Joe); 김성진(Sung Jin Kim); 이우영(Woo Young Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2010.48.04.342 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Carbon and graphite; chemical synthesis; hydrogen; transmission electron microscopy; TEM; hydrogen absorbing materials |
| 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 toPd NPs-functionalized SWNTs directly fabricated due to the existence of dendrimers. Pyrolysis of the dendrimers by heat treatment resulted in afast response time and high sensitivity owing to the reduced length of the dendrimers. Theseresults 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 (H2) in air. (Received October 27, 2009) |