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- 주제어 : vertically aligned multiwalled carbon nanotube (검색결과 2 건)
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Hyeongkeun Kim,Cheesung Lee,최재붕,전경용,김영진,백승현 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.3
The effects of sandwich-like catalysts on the vertical growth of multiwalled carbon nanotubes (MWCNTs) are investigated. We achieved the synthesis of 2.2-mm-long MWCNT forests with carefully designed catalyst films by thermal chemical vapor deposition. Two types of sandwich-like catalysts were prepared by electron beam evaporation. Fe and Al2O3 layers were deposited on a SiO2 surface of 300 nm in thickness. Here, Fe and Al2O3 were used for the catalyst and the supporting buffer layer, respectively. C2H4 was used as a carbon source while Ar and H2 were used as carrier gases. The sandwich-like catalyst supported by a buffer layer of Al2O3 significantly enhanced the quality of the CNTs. The termination of MWCNT growth was found to depend on the position of the Fe layer. Also, the type of sandwich-like catalyst affects the crystalline perfection of the MWCNTs.
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Kim, Youngmin,Lee, Seungjae,Lee, Kyungjun,Shim, Sangdeok,Kim, Jin Young,Lee, Hyung Woo,Choi, Dukhyun American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.22
<P>This study details the development of a large-area, three-dimensional (3D), plasmonic integrated electrode (PIE) system. Vertically aligned multiwalled carbon nanotube (VA-MWNT) electrodes are grown and populated with self-assembling silver nanoparticles via thermal evaporation. Due to the geometric and surface characteristics of VA-MWNTs, evaporated silver atoms form nanoparticles approximately 15–20 nm in diameter. The nanoparticles are well distributed on VA-MWNTs, with a 5–10 nm gap between particles. The size and gap of the self-assembled plasmonic nanoparticles is dependent upon both the length of the MWNT and the thickness of the evaporated silver. The wetting properties of water of the VA-MWNT electrodes change from hydrophilic (∼70°) to hydrophobic (∼120°) as a result of the evaporated silver. This effect is particularly pronounced on the VA-MWNT electrodes with a length of 1 μm, where the contact angle is altered from an initial 8° to 124°. Based on UV–visible spectroscopic analysis, plasmonic resonance of the PIE systems occurs at a wavelength of approximately 400 nm. The optical behavior was found to vary as a function of MWNT length, with the exception of MWNT with a length of 1 μm. Using our PIE systems, we were able to obtain clear surface-enhanced Raman scattering (SERS) spectra with a detection limit of ∼10 nM and an enhancement factor of ∼10<SUP>6</SUP>. This PIE system shows promise for use as a novel electrode system in next-generation optoelectronics such as photovoltaics, light-emitting diodes, and solar water splitting.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-22/am505999e/production/images/medium/am-2014-05999e_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am505999e'>ACS Electronic Supporting Info</A></P>
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