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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 images of Ni-coated needle electrodes. (a, b) Selective coating method and (c, d) selective etching method for a sharp needle electrode. Scale bars: 10 μm in (a, c) and 1 μm in (b, d).
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Figure 5: SEM images of Ni-coated needle electrodes. (a, b) Selective coating method and (c, d) selective etching method for a sharp needle electrode. Scale bars: 10 μm in (a, c) and 1 μm in (b, d).

Mentions: The method described in this report provides selective deposition of a desired area. The deposition area can be adjusted by controlling the dipping area of the CNT nanoneedle template in electrolyte using a microstage. As shown in Figure 5, the desired materials can be coated on the whole body of the needle or just the end of the needle. This makes possible the fabrication of needles having multiple functional groups in the longitudinal direction. CNT nanoneedles coated with other materials by electrodeposition have the disadvantage of a blunt tip end. Specifically, in the case of cell injection, a blunt needle requires a greater force to pass through the cell membrane, which causes damage to the cell membrane [28]. These problems can be resolved by selective etching of the coated material on the tip end. For a sharper needle, the materials coated on the tip end were selectively etched by etchant or electrolysis in a manner similar to selective deposition. An SEM image of a Ni-coated sharp needle is displayed in Figure 4c; this needle provides a very sharp tip by the exposed CNT at the end, as well as improved mechanical properties due to the coated Ni on the tip body.


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 images of Ni-coated needle electrodes. (a, b) Selective coating method and (c, d) selective etching method for a sharp needle electrode. Scale bars: 10 μm in (a, c) and 1 μm in (b, d).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: SEM images of Ni-coated needle electrodes. (a, b) Selective coating method and (c, d) selective etching method for a sharp needle electrode. Scale bars: 10 μm in (a, c) and 1 μm in (b, d).
Mentions: The method described in this report provides selective deposition of a desired area. The deposition area can be adjusted by controlling the dipping area of the CNT nanoneedle template in electrolyte using a microstage. As shown in Figure 5, the desired materials can be coated on the whole body of the needle or just the end of the needle. This makes possible the fabrication of needles having multiple functional groups in the longitudinal direction. CNT nanoneedles coated with other materials by electrodeposition have the disadvantage of a blunt tip end. Specifically, in the case of cell injection, a blunt needle requires a greater force to pass through the cell membrane, which causes damage to the cell membrane [28]. These problems can be resolved by selective etching of the coated material on the tip end. For a sharper needle, the materials coated on the tip end were selectively etched by etchant or electrolysis in a manner similar to selective deposition. An SEM image of a Ni-coated sharp needle is displayed in Figure 4c; this needle provides a very sharp tip by the exposed CNT at the end, as well as improved mechanical properties due to the coated Ni on the tip body.

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