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Anisotropic micro-cloths fabricated from DNA-stabilized carbon nanotubes: one-stop manufacturing with electrode needles.

Frusawa H, Yoshii G - Nanoscale Res Lett (2015)

Bottom Line: Among a variety of solution-based approaches to fabricate anisotropic films of aligned carbon nanotubes (CNTs), we focus on the dielectrophoretic assembly method using AC electric fields in DNA-stabilized CNT suspensions.It has been found that a maximal degree of polarization (ca. 40%) can be achieved by micro-cloths fabricated from a variety of DNA-CNT mixtures.Our results suggest that the one-stop method can impart biocompatibility to the downsized CNT films and that the DNA-stabilized CNT micro-cloths directly connected to an electrode could be useful for biofuel cells in terms of electron transfer and/or enzymatic activity.

View Article: PubMed Central - PubMed

Affiliation: Institute for Nanotechnology, Kochi University of Technology, Tosa-Yamada, 782-8502 Kochi Japan.

ABSTRACT
Among a variety of solution-based approaches to fabricate anisotropic films of aligned carbon nanotubes (CNTs), we focus on the dielectrophoretic assembly method using AC electric fields in DNA-stabilized CNT suspensions. We demonstrate that a one-stop manufacturing system using electrode needles can draw anisotropic DNA-CNT hybrid films of 10 to 100 µm in size (i.e., free-standing DNA-CNT micro-cloths) from the remaining suspension into the atmosphere while maintaining structural order. It has been found that a maximal degree of polarization (ca. 40%) can be achieved by micro-cloths fabricated from a variety of DNA-CNT mixtures. Our results suggest that the one-stop method can impart biocompatibility to the downsized CNT films and that the DNA-stabilized CNT micro-cloths directly connected to an electrode could be useful for biofuel cells in terms of electron transfer and/or enzymatic activity.

No MeSH data available.


FE-SEM images of DNA-stabilized CNT arrays. The aligned CNTs constitute electrically fabricated micro-cloths. Scale bars: 2 μm.
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Fig3: FE-SEM images of DNA-stabilized CNT arrays. The aligned CNTs constitute electrically fabricated micro-cloths. Scale bars: 2 μm.

Mentions: We used the FE-SEM to observe aligned CNT arrays inside an assembly film placed on a Cu grid substrate in the same manner as that of Figure 2c. The left image in Figure 3 shows an FE-SEM image of the surface, whereas a superficial rent is magnified in the right micrograph of Figure 3. These FE-SEM images reveal that the CNTs were aligned in parallel to the direction of the applied electric fields. From the adjustment of the SEM focus when observing dry CNT films, we found that the mean CNT film thickness was 5 to 10 μm [39].Figure 3


Anisotropic micro-cloths fabricated from DNA-stabilized carbon nanotubes: one-stop manufacturing with electrode needles.

Frusawa H, Yoshii G - Nanoscale Res Lett (2015)

FE-SEM images of DNA-stabilized CNT arrays. The aligned CNTs constitute electrically fabricated micro-cloths. Scale bars: 2 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385237&req=5

Fig3: FE-SEM images of DNA-stabilized CNT arrays. The aligned CNTs constitute electrically fabricated micro-cloths. Scale bars: 2 μm.
Mentions: We used the FE-SEM to observe aligned CNT arrays inside an assembly film placed on a Cu grid substrate in the same manner as that of Figure 2c. The left image in Figure 3 shows an FE-SEM image of the surface, whereas a superficial rent is magnified in the right micrograph of Figure 3. These FE-SEM images reveal that the CNTs were aligned in parallel to the direction of the applied electric fields. From the adjustment of the SEM focus when observing dry CNT films, we found that the mean CNT film thickness was 5 to 10 μm [39].Figure 3

Bottom Line: Among a variety of solution-based approaches to fabricate anisotropic films of aligned carbon nanotubes (CNTs), we focus on the dielectrophoretic assembly method using AC electric fields in DNA-stabilized CNT suspensions.It has been found that a maximal degree of polarization (ca. 40%) can be achieved by micro-cloths fabricated from a variety of DNA-CNT mixtures.Our results suggest that the one-stop method can impart biocompatibility to the downsized CNT films and that the DNA-stabilized CNT micro-cloths directly connected to an electrode could be useful for biofuel cells in terms of electron transfer and/or enzymatic activity.

View Article: PubMed Central - PubMed

Affiliation: Institute for Nanotechnology, Kochi University of Technology, Tosa-Yamada, 782-8502 Kochi Japan.

ABSTRACT
Among a variety of solution-based approaches to fabricate anisotropic films of aligned carbon nanotubes (CNTs), we focus on the dielectrophoretic assembly method using AC electric fields in DNA-stabilized CNT suspensions. We demonstrate that a one-stop manufacturing system using electrode needles can draw anisotropic DNA-CNT hybrid films of 10 to 100 µm in size (i.e., free-standing DNA-CNT micro-cloths) from the remaining suspension into the atmosphere while maintaining structural order. It has been found that a maximal degree of polarization (ca. 40%) can be achieved by micro-cloths fabricated from a variety of DNA-CNT mixtures. Our results suggest that the one-stop method can impart biocompatibility to the downsized CNT films and that the DNA-stabilized CNT micro-cloths directly connected to an electrode could be useful for biofuel cells in terms of electron transfer and/or enzymatic activity.

No MeSH data available.