نتایج جستجو برای: swnt engle walled carbon nanotube

تعداد نتایج: 290287  

Journal: :Nanotechnology 2007
Prashanth Makaram Selvapraba Selvarasah Xugang Xiong Chia-Ling Chen Ahmed Busnaina Nishant Khanduja Mehmet R Dokmeci

We present a hybrid approach that combines top-down fabrication with bottom-up directed assembly for making single-walled carbon nanotube (SWNT) based three-dimensional interconnects. The SWNTs are assembled using dielectrophoresis at room temperature on a microfabricated 3D platform. The two-terminal resistance of the assembled SWNTs at 10 Vpp assembly voltage is approximately 545 Ω. Simulatio...

2007
Hai M. Duong Erik Einarsson Jun Okawa Rong Xiang Shigeo Maruyama

An optical absorbance technique was used to study the burning temperature and burning mechanism of vertically aligned single-walled carbon nanotube (VA-SWNT) films. Use of this simple optical method is shown to be consistent with the standard thermogravimetric analysis (TGA) method, but can be applied to a very small amount of SWNTs. Experimental results indicate burning of the VA-SWNTs is not ...

Journal: :Physical review letters 2005
Flávio Plentz Henrique B Ribeiro Ado Jorio Michael S Strano Marcos A Pimenta

We present direct experimental observation of exciton-phonon bound states in the photoluminescence excitation spectra of isolated single-walled carbon nanotubes (SWNT) in aqueous suspension. The photoluminescence excitation spectra from several distinct SWNTs show the presence of at least one sideband related to the tangential modes, lying 0.2 eV above the main absorption or emission peak. Both...

Journal: :Journal of the American Chemical Society 2011
Xiaoxia Yang Lei Liu Muhong Wu Wenlong Wang Xuedong Bai Enge Wang

We present an innovative wet-chemistry-assisted nanotube-substitution reaction approach for the highly efficient synthesis of boron- and nitrogen-codoped single-walled carbon nanotubes (B(x)C(y)N(z)-SWNTs) in bulk quantities. The as-synthesized ternary system B(x)C(y)N(z)-SWNTs are of high purity and quality and have fairly homogeneous B and N dopant concentrations. Electrical transport measure...

2002
A. H. Mahan J. L. Alleman M. J. Heben P. A. Parilla K. M. Jones A. C. Dillon

Hot wire chemical vapor deposition ~HWCVD! has been employed for the continuous generation of carbon single-walled nanotube ~SWNT! materials. Interestingly, transmission electron microscopy analyses revealed only the presence of isolated SWNTs, rather than nanotubes existing in bundles. An analysis of the growth mechanism explaining the production of isolated SWNTs is provided. Also, the Raman ...

2005
W. Zhou J. Vavro N. M. Nemes J. E. Fischer K. Kamarás D. B. Tanner

The electronic properties of p-doped single-walled carbon nanotube SWNT bulk samples were studied by temperature-dependent resistivity and thermopower, optical reflectivity, and Raman spectroscopy. These all give consistent results for the Fermi level downshift EF induced by doping. We find EF 0.35 eV and 0.50 eV for concentrated nitric and sulfuric acid doping respectively. With these values, ...

Journal: :Nanotechnology 2008
Bharat Bhushan Barbara Galasso Cristina Bignardi Cattien V Nguyen Liming Dai Liangti Qu

The nanotribological characterization of carbon nanotubes is fundamental for the exploration of new sliding applications. In this study, a comprehensive investigation of adhesion, friction and wear of a multiwalled nanotube (MWNT) tip, and SWNT (single-walled nanotube) and MWNT arrays has been carried out. A nonlinear response of the MWNT tip is observed when the tip is brought into and out of ...

Journal: :Journal of the American Chemical Society 2006
Gordana Dukovic Milan Balaz Peter Doak Nina D Berova Ming Zheng Robert S McLean Louis E Brus

We have found that racemic mixtures of chiral single-walled nanotubes (SWNTs) wrapped with d(GT)20 DNA oligomer exhibit circular dichroism (CD). We attribute the CD signal to induced CD arising from the coupling of transition moments of the SWNTs and the DNA. Although the nanotube mixture appears to contain both enantiomers in equal amounts, DNA-SWNT transition moment interaction is more constr...

Journal: :Journal of the American Chemical Society 2009
Sang-Yong Ju Marcel Utz Fotios Papadimitrakopoulos

Utilization of single-walled carbon nanotubes (SWNTs) in high-end applications hinges on separating metallic (met-) from semiconducting (sem-) SWNTs. Surfactant amines, like octadecylamine (ODA) have proven instrumental for the selective extraction of sem-SWNTs from tetrahydrofuran (THF) nanotube suspensions. The chemical shift differences along the tail of an asymmetric, diacetylenic surfactan...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2008
Senlin Chen Yugui Jiang Zhiqiang Wang Xi Zhang Liming Dai Mario Smet

We have succeeded in dispersing single-walled carbon nanotubes (SWNTs) into an aqueous solution of poly(ethylene glycol)-terminated malachite green derivative (PEG-MG) through simple sonication. It was found that UV exposure caused reaggregation of these predispersed SWNTs in the same aqueous medium, as adsorbed PEG-MG photochromic chains could be effectively photocleavaged from the nanotube su...

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