Alignment and Deposition of Single Wall Carbon Nanotubes under the Influence of an Electric Field

2002 ◽  
Vol 761 ◽  
Author(s):  
Paul Jaynes ◽  
Thomas Tiano ◽  
Margaret Roylance ◽  
Charles Carey ◽  
Kenneth McElrath
Keyword(s):  
Carbon Nanotubes ◽  
Electric Field ◽  
Electronic Devices ◽  
Physical And Mechanical Properties ◽  
Single Wall Carbon Nanotubes ◽  
Enabling Technology ◽  
Single Wall Carbon ◽  
Nanoelectronic Devices ◽  
Wide Range ◽  
Field Lines

ABSTRACTSingle wall carbon nanotubes have aroused a great deal of interest because of their unique combination of electrical, physical and mechanical properties. However, the widespread use of SWNTs in composites and electronic devices is limited because of the difficulty of dispersing and processing these materials. This paper describes a method for depositing and aligning SWNTs from a dispersed solution onto a substrate under the influence of an electric field. Results indicate that SWNTs can be aligned in bulk in the direction of electric field lines, and that individual SWNT ropes may be deposited between two electrodes. The extent and type of deposition depends upon the electrode geometry and processing time. Electrical alignment of SWNTs is an enabling technology allowing manipulation of nanomaterials using standard processing. It could eventually lead to a wide range of products, such as nanocomposites with aligned fillers and nanoelectronic devices.

Alignment and Deposition of Single Wall Carbon Nanotubes under the Influence of an Electric Field

2002 ◽  
Vol 741 ◽  
Author(s):  
Paul Jaynes ◽  
Thomas Tiano ◽  
Margaret Roylance ◽  
Charles Carey ◽  
Kenneth McElrath
Keyword(s):  
Carbon Nanotubes ◽  
Electric Field ◽  
Electronic Devices ◽  
Physical And Mechanical Properties ◽  
Single Wall Carbon Nanotubes ◽  
Enabling Technology ◽  
Single Wall Carbon ◽  
Nanoelectronic Devices ◽  
Wide Range ◽  
Field Lines

ABSTRACTSingle wall carbon nanotubes have aroused a great deal of interest because of their unique combination of electrical, physical and mechanical properties. However, the widespread use of SWNTs in composites and electronic devices is limited because of the difficulty of dispersing and processing these materials. This paper describes a method for depositing and aligning SWNTs from a dispersed solution onto a substrate under the influence of an electric field. Results indicate that SWNTs can be aligned in bulk in the direction of electric field lines, and that individual SWNT ropes may be deposited between two electrodes. The extent and type of deposition depends upon the electrode geometry and processing time. Electrical alignment of SWNTs is an enabling technology allowing manipulation of nanomaterials using standard processing. It could eventually lead to a wide range of products, such as nanocomposites with aligned fillers and nanoelectronic devices.

Biological Interactions of Functionalized Single-Wall Carbon Nanotubes in Human Epidermal Keratinocytes

2007 ◽  
Vol 26 (2) ◽  
pp. 103-113 ◽  
Author(s):  
Leshuai W. Zhang ◽  
Liling Zeng ◽  
Andrew R. Barron ◽  
Nancy A. Monteiro-Riviere
Keyword(s):  
Carbon Nanotubes ◽  
Cell Viability ◽  
Single Wall Carbon Nanotubes ◽  
Epidermal Keratinocytes ◽  
Human Epidermal Keratinocytes ◽  
Single Wall Carbon ◽  
Biological Compatibility ◽  
Tnf Α ◽  
Wide Range ◽  
Significant Difference

Carbon nanotube–based nanovectors, especially functionalized nanotubes, have shown potential for therapeutic drug delivery. 6-Aminohexanoic acid–derivatized single-wall carbon nanotubes (AHA-SWNTs) are soluble in aqueous stock solutions over a wide range of physiologically relevant conditions; however, their interactions with cells and their biological compatibility has not been explored. Human epidermal keratinocytes (HEKs) were dosed with AHA-SWNTs ranging in concentration from 0.00000005 to 0.05 mg/ml. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) cell viability decreased significantly ( p < .05) from 0.00005 to 0.05 mg/ml after 24 h. The proinflammatory mediators of inflammation cytokines interleukin (IL)-6, IL-8, tumor necrosis factor (TNF)- α, IL-10, and IL-1 β were also assessed. Cytokine analysis did not show a significant increase in IL-6 and IL-8 in the medium containing 0.000005 mg/ml of AHA-SWNTs from 1 to 48 h. IL-6 increased in cells treated with 0.05 mg/ml of AHA-SWNTs from 1 to 48 h, whereas IL-8 showed a significant increase at 24 and 48 h. No significant difference ( p < .05) was noted with TNF- α, IL-10, and IL-1 β expression at any time point. Transmission electron microscopy of HEKs treated with 0.05 mg/ml AHA-SWNTs for 24 h depicted AHA-SWNTs localized within intracytoplasmic vacuoles in HEKs. Treatment with the surfactant 1% Pluronic F127 caused dispersion of the AHA-SWNT aggregates in the culture medium and less toxicity. These data showed that the lower concentration of 0.000005 mg/ml of AHA-SWNTs maintains cell viability and induces a mild cytotoxicity, but 0.05 mg/ml of AHA-SWNTs demonstrated an irritation response by the increase in IL-8.

Scanning Tunneling Microscopy and Spectroscopy Studies of Single Wall Carbon Nanotubes

1998 ◽  
Vol 13 (9) ◽  
pp. 2380-2388 ◽  
Author(s):  
Teri Wang Odom ◽  
Jin-Lin Huang ◽  
Philip Kim ◽  
Min Ouyang ◽  
Charles M. Lieber
Keyword(s):  
Carbon Nanotubes ◽  
Scanning Tunneling Microscopy ◽  
Single Wall Carbon Nanotubes ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Metallic Behavior ◽  
Single Wall Carbon ◽  
Wide Range ◽  
Theoretical Predictions ◽  
Spectroscopy Studies

Scanning tunneling microscopy and spectroscopy have been used to characterize the atomic structure and tunneling density of states of individual single wall carbon nanotubes (SWNT's) and ropes containing many SWNT's. Analysis of atomically resolved SWNT images shows that the nanotubes consist of a wide range of diameters and helicities with no one structure clearly dominant. Tunneling spectroscopy measurements made simultaneously on atomically resolved SWNT's exhibit semiconducting and metallic behavior that depend predictably on helicity and diameter. In addition the band gaps of the semiconducting tubes were also found to depend inversely on diameter. These results are compared to theoretical predictions, and the implications of these studies as well as important future directions are discussed.

Optically enhanced charge transfer between C60and single-wall carbon nanotubes in hybrid electronic devices

Nanoscale ◽  
2014 ◽  
Vol 6 (1) ◽  
pp. 572-580 ◽  
Author(s):  
Christopher S. Allen ◽  
Guoquan Liu ◽  
Yabin Chen ◽  
Alex W. Robertson ◽  
Kuang He ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transfer ◽  
Electronic Devices ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

Electric field alignment of single wall carbon nanotubes (SWNT) in polymers

2005 ◽  
Author(s):  
Sumanth Banda ◽  
Zoubeida Ounaies ◽  
Tyler St Clair ◽  
Jared Rud ◽  
Kristin Burney ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electric Field ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

Growth, dispersion, and electronic devices of nitrogen-doped single-wall carbon nanotubes

2012 ◽  
Vol 249 (12) ◽  
pp. 2416-2419 ◽  
Author(s):  
Antonios Oikonomou ◽  
Toma Susi ◽  
Esko I. Kauppinen ◽  
Aravind Vijayaraghavan
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Devices ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Nitrogen Doped

scholarly journals Electrical Resistivity of Pristine and Functional Single-Wall Carbon Nanotubes

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Yijiang Lu ◽  
Jing Li ◽  
Haiping Hong
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Resistivity ◽  
Electric Field ◽  
Polymer Nanocomposites ◽  
Functional Group ◽  
Single Wall Carbon Nanotubes ◽  
Electrical Field ◽  
Interdigitated Electrode ◽  
Single Wall Carbon ◽  
Lower Resistivity

The resistance of several pristine and functional single-wall carbon nanotubes (SWNTs) deposited and dried on interdigitated electrode (IDE) chips was investigated to better understand how functional groups influence their resistivity. Without the external electrical field, the resistance was generally increased for the sulfonated and fluorinated SWNTs but not for COOH-SWNTs. With a 3 V electric field applied during depositing, while no change in resistance was found for the purified pristine SWNTs, fluorinated SWNTs, COOH SWNTs, and Ni-SWNTs, a significant decrease in resistance was observed in sulfonated SWNTs and unpurified pristine SWNTs, which could be due to the alignment of SWNTs in an electric field. The alignment of the sulfonated SWNTs is most likely due to the charge of the sulfate functional group. It is interesting to note that the alignment was found in the unpurified pristine SWNTs but not in the purified pristine ones which have lessened resistivity. The lower resistivity in the purified pristine SWNTs may be due to the smaller number (<5%) of impurities. The significance of this research is that hydrophilic COOH-SWNTs could be a better candidate than the hydrophobic pristine SWNTs for being used in many applications, especially in polymer nanocomposites.

Carbon Nanotube-Based Stretchable Hybrid Material Film for Electronic Devices and Applications

2020 ◽  
Vol 20 (7) ◽  
pp. 4549-4556
Author(s):  
Laura Fazi ◽  
Daniele Mirabile Gattia ◽  
Luigi Pavone ◽  
Anna Prioriello ◽  
Valerio Scacco ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Electronic Devices ◽  
Electrical Characterization ◽  
Technological Application ◽  
Single Wall Carbon Nanotubes ◽  
Inert Material ◽  
Wide Range ◽  
Strong Adhesion ◽  
Simple Technology

To meet the increasing demand, for stretchable conductive materials in a wide range of applications, innovative conductors based on single wall carbon nanotubes (SWCNT) self-grafted on different polymer films, are assembled. Aiming at a simple technology for flexible and stretchable electronic devices, and contrary to what commonly reported for carbon nanotubes (CNT), no chemical functionalization of SWCNT is necessary for stable grafting onto several polymeric surfaces. The novelty and functionality of our composite materials stand in the synergy among the intrinsic biocompatibility of CNT, a fully inert material, their electrical conductivity, and the stretchable-viscoelastic properties of the polymer-nanotube bundles composites. Electrical characterization of both unstretched and strongly stretched planar film conductors is provided, demonstrating the use of this new composite material for technological application. Also, an insight into the mechanisms of strong adhesion to the polymer is obtained by scanning electron microscopy (SEM) of the surface composite. As an example of technological application of such stretchable circuitry, the electrical functionality of a carbon nanotube-based six-sensor (electrode) grid is used to record subdural electrocorticograms in freely-moving laboratory rats over approximately three months.

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