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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

Potentiometric response to pH changes of the nanoneedle electrodes coated with PPy.
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Figure 6: Potentiometric response to pH changes of the nanoneedle electrodes coated with PPy.

Mentions: For real applications, we demonstrated a needle type pH sensor using a PPy-coated nanoneedle. pH is one of the most important factors in chemical, biological, and medical applications. In particular, intracellular pH is an interest factors to most biologists because changes in intracellular pH affect the ionization state of all weak acids and weak bases and thus potentially affect a wide array of biological processes [29]. The nanoneedle pH sensor enables measurement of intracellular pH [11]. The potentiometric response of PPy-coated nanoneedle to the change in buffer electrolyte pH was measured for a pH range 4 to 10. PPy-coated nanoneedle and Ag/AgCl electrodes were connected to working and reference electrodes. As shown in Figure 6, pH dependence was linear and the sensitivity was 46.16 mV/pH at 23°C. These pH sensors with very small feature will be able to measure not only intracellular pH but also small region pH.


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)

Potentiometric response to pH changes of the nanoneedle electrodes coated with PPy.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 6: Potentiometric response to pH changes of the nanoneedle electrodes coated with PPy.
Mentions: For real applications, we demonstrated a needle type pH sensor using a PPy-coated nanoneedle. pH is one of the most important factors in chemical, biological, and medical applications. In particular, intracellular pH is an interest factors to most biologists because changes in intracellular pH affect the ionization state of all weak acids and weak bases and thus potentially affect a wide array of biological processes [29]. The nanoneedle pH sensor enables measurement of intracellular pH [11]. The potentiometric response of PPy-coated nanoneedle to the change in buffer electrolyte pH was measured for a pH range 4 to 10. PPy-coated nanoneedle and Ag/AgCl electrodes were connected to working and reference electrodes. As shown in Figure 6, pH dependence was linear and the sensitivity was 46.16 mV/pH at 23°C. These pH sensors with very small feature will be able to measure not only intracellular pH but also small region pH.

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