Fabrication of Carbon Nanotube Langmuir-Blodgett Film by Polyion Complex Method
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0963-Q05-35
Fabrication of Carbon Nanotube Langmuir-Blodgett Film by Polyion Complex Method Jun Matsui1,2, Manabu Iko1, Nobuhiro Inokuma1, Hironori Orikasa1, Takashi Kyotani1, and Tokuji Miyashita1 1 Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan 2 Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, 332-0012, Japan
ABSTRACT Carbon nanotube Langmuir-Blodgett film was fabricated using polyion complex method. Multi-walled carbon nanotube (MWCNT) synthesized by template method form a stable polyion complex monolayer at the air/water interface. The monolayer can be transferred onto a solid substrate. The AFM image of the monolayer shows a one-dimensional network structure of MWCNT..
INTRODUCTION Carbon nanotubes (CNTs) have great interest in both industrial and fundamental research because of their unique electric and mechanical properties. It is important to assemble CNT into two to three dimension to apply CNT to electric and optic devices. Several assembly techniques such as spraying,[1] self-assembly[2] and Langmuir-Blodgett technique[3] have been reported. Recently we have fabricated multi-walled carbon nanotube (MWCNT) monolayer using the liquid/liquid interface.[4] The process is simple and MWCNT need not to be chemically functionalized. These reported works are concerned in fabricating closed packed CNT film. For understanding electron conduction mechanism of CNTs, it will be useful to construct onedimensionally connected CNT network. In this paper, we report a fabrication of one-dimensional MWCNT network structure using the Langmuir-Blodgett technique. The monolayer properties of MWCNT spread onto an ultra pure water subphase and a subphase containing cationic polymer were discussed by surface pressure (π)–area (A) isotherm. The MWCNT monolayer formed at the air/water interface was transferred onto a solid substrate and the surface morphology was observed by an atomic force microscope (AFM)
EXPERIMENT MWCNTs were synthesized by the template method reported elsewhere[5]. Briefly, aluminum plate was anodically oxidized 5 min with constant voltage of 10 V in sulfuric acid (20 wt %) to produce 5 mm straight nanochannels of aluminum oxide onto the plate. The anodized
aluminum plate was used as a template for MWCNT synthesis. Chemical vapor deposition of acetylene gas (873 K) was carried out onto the anodically oxide plate to coat carbon onto the plate. Then the template was dissolved by immersing it in 1 M NaOH aqueous solution. The tube liberated from the template was washed several times with NaCl solution, and then filtrated by a membrane filter. Finally, the collected MWCNT was dispersed in ethanol (≈0.01mg/mL). Measurement of surface π-A isotherm and deposition of monolayers were carried out with an automatic Langmuir trough (trough size 180 mm×100 mm) at 15 ˚C and compressed at a rate of 1 cm/min. Ultra pure water and 20 wt% poly(diallyldimethylammoniu
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