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Fabrication of functional micro- and nanoneedle electrodes using a carbon nanotube template and electrodeposition.

An T, Choi W, Lee E, Kim IT, Moon W, Lim G - Nanoscale Res Lett (2011)

Bottom Line: Carbon nanotube (CNT) is an attractive material for needle-like conducting electrodes because it has high electrical conductivity and mechanical strength.However, CNTs cannot provide the desired properties in certain applications.Through electrodeposition, Au, Ni, and polypyrrole were each coated successfully onto CNT nanoneedle electrodes to obtain the desired properties.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea. limmems@postech.ac.kr.

ABSTRACT
Carbon nanotube (CNT) is an attractive material for needle-like conducting electrodes because it has high electrical conductivity and mechanical strength. However, CNTs cannot provide the desired properties in certain applications. To obtain micro- and nanoneedles having the desired properties, it is necessary to fabricate functional needles using various other materials. In this study, functional micro- and nanoneedle electrodes were fabricated using a tungsten tip and an atomic force microscope probe with a CNT needle template and electrodeposition. To prepare the conductive needle templates, a single-wall nanotube nanoneedle was attached onto the conductive tip using dielectrophoresis and surface tension. Through electrodeposition, Au, Ni, and polypyrrole were each coated successfully onto CNT nanoneedle electrodes to obtain the desired properties.

No MeSH data available.


Related in: MedlinePlus

Schematic diagram of the nanoneedle fabrication process. (a) A carbon nanotube nanoneedle using dielectrophoresis and (b) a functional material-coated micro- or nanoneedle using electrodeposition.
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Figure 1: Schematic diagram of the nanoneedle fabrication process. (a) A carbon nanotube nanoneedle using dielectrophoresis and (b) a functional material-coated micro- or nanoneedle using electrodeposition.

Mentions: As shown in Figure 1a, two tungsten tips were placed a few micrometers apart, and an AC electric field of 1 MHz frequency and 10-Vp-p amplitude was applied between them. When a suspension droplet was placed between the electrodes, SWNTs were attracted toward the region between the tips of the electrodes due to the DEP force. The suspension was then partially removed, and the remaining suspension formed a water meniscus between the tungsten tips. The collected SWNTs were compressed by the surface tension and attached to the tungsten tip. As a result, a CNT bundle nanowire was fabricated between the tips. For the fabrication of CNT nanoneedles, the center of the CNT bundle nanowire, a weak point, was cut using high electric current.


Fabrication of functional micro- and nanoneedle electrodes using a carbon nanotube template and electrodeposition.

An T, Choi W, Lee E, Kim IT, Moon W, Lim G - Nanoscale Res Lett (2011)

Schematic diagram of the nanoneedle fabrication process. (a) A carbon nanotube nanoneedle using dielectrophoresis and (b) a functional material-coated micro- or nanoneedle using electrodeposition.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211392&req=5

Figure 1: Schematic diagram of the nanoneedle fabrication process. (a) A carbon nanotube nanoneedle using dielectrophoresis and (b) a functional material-coated micro- or nanoneedle using electrodeposition.
Mentions: As shown in Figure 1a, two tungsten tips were placed a few micrometers apart, and an AC electric field of 1 MHz frequency and 10-Vp-p amplitude was applied between them. When a suspension droplet was placed between the electrodes, SWNTs were attracted toward the region between the tips of the electrodes due to the DEP force. The suspension was then partially removed, and the remaining suspension formed a water meniscus between the tungsten tips. The collected SWNTs were compressed by the surface tension and attached to the tungsten tip. As a result, a CNT bundle nanowire was fabricated between the tips. For the fabrication of CNT nanoneedles, the center of the CNT bundle nanowire, a weak point, was cut using high electric current.

Bottom Line: Carbon nanotube (CNT) is an attractive material for needle-like conducting electrodes because it has high electrical conductivity and mechanical strength.However, CNTs cannot provide the desired properties in certain applications.Through electrodeposition, Au, Ni, and polypyrrole were each coated successfully onto CNT nanoneedle electrodes to obtain the desired properties.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea. limmems@postech.ac.kr.

ABSTRACT
Carbon nanotube (CNT) is an attractive material for needle-like conducting electrodes because it has high electrical conductivity and mechanical strength. However, CNTs cannot provide the desired properties in certain applications. To obtain micro- and nanoneedles having the desired properties, it is necessary to fabricate functional needles using various other materials. In this study, functional micro- and nanoneedle electrodes were fabricated using a tungsten tip and an atomic force microscope probe with a CNT needle template and electrodeposition. To prepare the conductive needle templates, a single-wall nanotube nanoneedle was attached onto the conductive tip using dielectrophoresis and surface tension. Through electrodeposition, Au, Ni, and polypyrrole were each coated successfully onto CNT nanoneedle electrodes to obtain the desired properties.

No MeSH data available.


Related in: MedlinePlus