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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

SEM image of a carbon nanotube nanoneedle. (a) A tungsten tip and (b) an AFM tip. Scale bar: 10 μm. Insets show a magnified view (scale bar: 1 μm).
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Figure 2: SEM image of a carbon nanotube nanoneedle. (a) A tungsten tip and (b) an AFM tip. Scale bar: 10 μm. Insets show a magnified view (scale bar: 1 μm).

Mentions: CNT is an attractive material for micro- and nanoneedle electrodes because of its unique properties, such as small-diameter needle-like geometry, excellent mechanical properties, and high electric conductivity. For real applications of micro- and nanoneedles, the needle must be attached to a supporting structure such as an AFM tip or a metal tip. CNT can be easily attached to the end of a metal tip or an AFM tip using DEP [21]. As depicted in Figure 2, a CNT nanoneedle electrode was successfully fabricated on the end of a tungsten tip and an AFM tip. The diameter of the CNT nanoneedle was ca. 100 nm, which could be controlled by changing the concentration of the suspension, the amplitude of the AC voltage, and the collection time [22,23]. The length of the CNT nanoneedle was determined by the spacing between the tungsten tips. The contact area between the tungsten tip and CNT nanoneedle was very large because a large amount of CNTs were deposited around the electrodes when the SWNT suspension was removed and the meniscus was formed (Figure 2). Therefore, CNT nanoneedles prepared by this method typically showed low contact resistance and a mechanically strong junction, which are extremely desirable features for various applications in nanoneedle devices.


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)

SEM image of a carbon nanotube nanoneedle. (a) A tungsten tip and (b) an AFM tip. Scale bar: 10 μm. Insets show a magnified view (scale bar: 1 μm).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: SEM image of a carbon nanotube nanoneedle. (a) A tungsten tip and (b) an AFM tip. Scale bar: 10 μm. Insets show a magnified view (scale bar: 1 μm).
Mentions: CNT is an attractive material for micro- and nanoneedle electrodes because of its unique properties, such as small-diameter needle-like geometry, excellent mechanical properties, and high electric conductivity. For real applications of micro- and nanoneedles, the needle must be attached to a supporting structure such as an AFM tip or a metal tip. CNT can be easily attached to the end of a metal tip or an AFM tip using DEP [21]. As depicted in Figure 2, a CNT nanoneedle electrode was successfully fabricated on the end of a tungsten tip and an AFM tip. The diameter of the CNT nanoneedle was ca. 100 nm, which could be controlled by changing the concentration of the suspension, the amplitude of the AC voltage, and the collection time [22,23]. The length of the CNT nanoneedle was determined by the spacing between the tungsten tips. The contact area between the tungsten tip and CNT nanoneedle was very large because a large amount of CNTs were deposited around the electrodes when the SWNT suspension was removed and the meniscus was formed (Figure 2). Therefore, CNT nanoneedles prepared by this method typically showed low contact resistance and a mechanically strong junction, which are extremely desirable features for various applications in nanoneedle devices.

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