Controlled Deposition and Applied Field Alignment of Single Walled Carbon Nanotubes for CNT Device Fabrication.

ABSTRACTCarbon nanotubes (CNTs) offer great potential for advanced sensing devices due to their unique electronic transport properties. However, a significant obstacle to the realization of practical CNT devices is the formation of controlled, reliable and reproducible CNT to metallic contacts. In this work, a procedure for the deposition and alignment of CNTs onto metallic electrodes using chemically functionalized lithographic patterns is reported. This method uses photo and electron beam lithography to pattern simple Cr/Au thin film circuits on oxidized Si substrates. The circuits are then re-patterned with a self-assembled monolayer (SAM) of 3-aminopropyltriethoxysilane (APTES) to specify desired CNT locations between electrodes. The application of an electric field to the metallic contacts during the deposition of solution suspended single walled CNTs causes alignment of the CNTs in the field direction. This method consistently produces aligned CNTs in the defined locations.

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Measurement and study of thermophysical properties of nanofluids with carbon nanotubes

Journal of Physics Conference Series ◽

10.1088/1742-6596/2119/1/012117 ◽

2021 ◽

Vol 2119 (1) ◽

pp. 012117

Author(s):

V Ya Rudyak ◽

G R Dashapilov ◽

A A Shupik

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Light Scattering ◽

Dynamic Light Scattering ◽

Thermophysical Properties ◽

Weight Concentration ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Single Walled Cnts ◽

Walled Cnts

Abstract This article is devoted to the study of the thermophysical properties of nanofluids with single-walled and multi-walled carbon nanotubes (CNT). Their weight concentration varied from 0.05 to 0.2%. Nanofluids, based on ethylene glycol and water, were studied. Dispersants were also used. The diffusion of CNT had been systematically investigated by the method of dynamic light scattering and their effective hydrodynamic dimensions were determined. The rheology and viscosity of all nanofluids were studied. It is shown that nanofluids are either pseu-doplastic or viscoplastic. Their rheology changes with increasing CNT concentration and temperature. However, in all cases, the viscosity of nanofluids with single-walled CNTs is signifi-cantly higher than that of nanofluids with multi-walled CNTs. In the last part, the electrical conductivity of all these nanofluids and the dispersants effect on it are investigated.

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FABRICATION OF CARBON NANOTUBE FIELD EFFECT TRANSISTORS WITH OCMC DISPERSED SINGLE-WALLED CARBON NANOTUBES

International Journal of Nanoscience ◽

10.1142/s0219581x10006995 ◽

2010 ◽

Vol 09 (04) ◽

pp. 377-381

Author(s):

KUMAR RAJ ◽

QING ZHANG ◽

LIANGYU YAN ◽

MARY B. CHAN PARK

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Field Effect ◽

Field Effect Transistors ◽

Single Walled Carbon Nanotubes ◽

Oxygen Adsorption ◽

P Type ◽

Walled Carbon Nanotubes ◽

Single Walled Cnts ◽

Walled Cnts

We report on the fabrication of carbon nanotube field effect transistors (CNTFETs) from dispersed single-walled CNTs using OCMC (O-Carboxymethylchitosan) as the surfactant. The as-prepared devices exhibit p-type as well as ambipolar characteristics due to oxygen adsorption at the metal/nanotube contacts. The Raman scattering from the SWCNTs shows that OCMC disperses CNTs efficiently. Rapid thermal annealing (RTA) at 400°C for 5 min is found to partially remove OCMC from the surface of SWCNTs.

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Dispersion of Carbon Nanotubes with “Green” Detergents

Molecules ◽

10.3390/molecules26102908 ◽

2021 ◽

Vol 26 (10) ◽

pp. 2908

Author(s):

Kazuo Umemura ◽

Ryo Hamano ◽

Hiroaki Komatsu ◽

Takashi Ikuno ◽

Eko Siswoyo

Keyword(s):

Carbon Nanotubes ◽

Sodium Dodecyl ◽

Detergent Solution ◽

Absorbance Spectroscopy ◽

Fundamental Research ◽

The Stability ◽

Single Walled Cnts ◽

Better Than ◽

Walled Cnts ◽

Cnt Suspensions

Solubilization of carbon nanotubes (CNTs) is a fundamental technique for the use of CNTs and their conjugates as nanodevices and nanobiodevices. In this work, we demonstrate the preparation of CNT suspensions with “green” detergents made from coconuts and bamboo as fundamental research in CNT nanotechnology. Single-walled CNTs (SWNTs) with a few carboxylic acid groups (3–5%) and pristine multi-walled CNTs (MWNTs) were mixed in each detergent solution and sonicated with a bath-type sonicator. The prepared suspensions were characterized using absorbance spectroscopy, scanning electron microscopy, and Raman spectroscopy. Among the eight combinations of CNTs and detergents (two types of CNTs and four detergents, including sodium dodecyl sulfate (SDS) as the standard), SWNTs/MWNTs were well dispersed in all combinations except the combination of the MWNTs and the bamboo detergent. The stability of the suspensions prepared with coconut detergents was better than that prepared with SDS. Because the efficiency of the bamboo detergents against the MWNTs differed significantly from that against the SWNTs, the natural detergent might be useful for separating CNTs. Our results revealed that the use of the “green” detergents had the advantage of dispersing CNTs as well as SDS.

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(n,m) Assignments and quantification for single-walled carbon nanotubes on SiO2/Si substrates by resonant Raman spectroscopy

Nanoscale ◽

10.1039/c5nr01076d ◽

2015 ◽

Vol 7 (24) ◽

pp. 10719-10727 ◽

Cited By ~ 29

Author(s):

Daqi Zhang ◽

Juan Yang ◽

Feng Yang ◽

Ruoming Li ◽

Meihui Li ◽

...

Keyword(s):

Carbon Nanotubes ◽

Raman Spectroscopy ◽

Single Walled Carbon Nanotubes ◽

Single Walled Carbon ◽

Si Substrates ◽

Resonant Raman ◽

Walled Carbon Nanotubes

An ωRBM–dt relation specifically suitable for random SWNTs on SiO2/Si substrates grown by various catalysts.

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Chemical Attachment of Functionalized Single-Walled Carbon Nanotubes on Self-Assembled Monolayer

Solid State Phenomena - Nanoscience and Technology ◽

10.4028/3-908451-30-2.491 ◽

2007 ◽

pp. 491-494

Author(s):

Moon Hee Lee ◽

Sung Kyoung Kim ◽

Hee Young Choi ◽

Ha Jin Lee ◽

Sun Young Koo ◽

...

Keyword(s):

Carbon Nanotubes ◽

Single Walled Carbon Nanotubes ◽

Self Assembled Monolayer ◽

Single Walled Carbon ◽

Self Assembled ◽

Walled Carbon Nanotubes

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Various Nanotube Scaffolds for Cell Proliferation

Materials Science Forum ◽

10.4028/www.scientific.net/msf.631-632.181 ◽

2009 ◽

Vol 631-632 ◽

pp. 181-186 ◽

Cited By ~ 2

Author(s):

Fumio Watari ◽

T. Akasaka ◽

K. Ishikawa ◽

M. Matsuoka ◽

E. Hirata ◽

...

Keyword(s):

Carbon Nanotubes ◽

Cell Proliferation ◽

Body Fluid ◽

Biomedical Applications ◽

Cell Edge ◽

The One ◽

Single Walled Cnts ◽

Cells Cultured ◽

Walled Cnts ◽

Multiwalled Cnts

Carbon nanotubes (CNT) and their derivatives with different structure and compositions have unique features. In the present study, cell proliferation was performed on various nanotubes such as single walled CNTs, multiwalled CNTs and imogolite which is nanotubes of aluminosilicate. SEM observation of the growth of osteoblast-like cells cultured on CNTs showed the morphology fully developed for the whole direction, which was different from that extended to the one direction on the usual scaffold. Numerous filopodia were grown from cell edge, extended far long and combined with CNT meshwork. Apatite precipitation in simulated body fluid, affinity for proteins and saccharides, and nanosize meshwork structure with large porosity would be the properties responsible for these cell adhesion and growth. Imogolite showed the similar properties to CNTs. Nanotubes could be the favorable materials for biomedical applications.

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