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Pt nanoparticle-supported multiwall carbon nanotube electrodes for amperometric hydrogen detection

Title
Pt nanoparticle-supported multiwall carbon nanotube electrodes for amperometric hydrogen detection
Author
성기훈
Keywords
Hydrogen sensor; Amperometric gas sensor; Pt/MWNT nanocomposites; Electrochemical sensor
Issue Date
2011-07
Publisher
ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Citation
SENSORS AND ACTUATORS B-CHEMICAL, 권: 155, 호: 1, 페이지: 191-198
Abstract
Platinum nanoparticles (Pt NPs) were grown directly on multiwall carbon nanotubes (MWNTs) using a wet chemical reduction process. Gas permeable Pt NP-supported MWNT (Pt/MWNT) electrodes were then formed on microporous PTFE membranes through the vacuum-filtration of a Pt/MWNT solution. The potential use of these electrodes in amperometric hydrogen sensor applications was assessed. Various material analysis methods such as SEM, TEM and XRD were employed in order to characterize the morphologies and microstructures of the Pt/MWNT nanocomposites. The electrodes exhibited a nanoporous interwoven surface morphology as a result of Pt agglomerates attached to the MWNTs. From the XRD and TEM measurements, individual polygonal Pt NPs were confirmed to have polycrystalline face-centered cubic (fcc) structures and very small particle sizes of 2-7 nm. The electrode fabrication process was sequentially optimized by adjusting the MWNT content. H(2)PtCl(6) concentration, NaBH(4) concentration, and the drying temperature. At optimized conditions, the Pt/MWNT electrode displayed a high sensitivity greater than 200 mu A/ppm, a fairly good selectivity to interfering CO species, and an excellent linear response over the wide concentration range of 5-1000 ppm. Furthermore, the performances of the electrodes were found to be better than those of binary NP-supported MWNT systems (Pt-Pd/MWNT, Pt-Zn/MWNT, Pt-Ni/MWNT and Pt-ZnO/MWNT).
URI
https://www.sciencedirect.com/science/article/pii/S0925400510009147?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/72926
ISSN
0925-4005
DOI
10.1016/j.snb.2010.11.045
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
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