Long‐Range Electron Transfer through a Single‐walled Carbon Nanotube Sheet

Saito, Tetsuya; Matsuura, Koji; Ohshima, Satoshi; Yumura, Motoo; Iijima, Sumio

doi:10.1002/adma.200702437

Cited by 7 publications

(8 citation statements)

References 22 publications

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“…After the cell was vacuum-pumped and refilled with N 2 gas three times, it was completely sealed and kept at 4 °C. The absorbances at 530 and 550 nm (Q-band) were used to calculate the concentration of each Cyt- c species ([Cyt- c ]) using a standard procedure. , The concentration of SWCNTs was low enough so that the absorption due to SWCNTs was negligible at these wavelengths.…”

Section: Methodsmentioning

confidence: 99%

“…Reactivity of native SWCNTs in electron transfer reactions is known to depend on electronic structure and chirality. − The SWCNT sample used in this study contains various chiral tubes. As a result, the electrochemical reduction potential of Cyt- c lies in the middle of those of native SWCNTs. − …”

Section: Introductionmentioning

confidence: 99%

“…Also, most surfactants affect the protein structure severely. Thus, all previous studies of SWCNT and Cyt- c have been done with the SWCNTs fixed in the form of solid films, for instance, as an electrode for electrochemical measurements. ,− We have carried out a series of experiments to find out a condition to disperse SWCNTs stably over a month in buffer solution without using additives.…”

Section: Introductionmentioning

confidence: 99%

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Single-Walled Carbon Nanotube as 1D Array of Reacting Sites: Reaction Kinetics of Reduction of Cytochrome c in Tris Buffer

Nakashima

Sano

2011

J. Phys. Chem. C

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Dispersed single-walled carbon nanotubes (SWCNTs) reduce cytochrome c (Cyt-c) when simply mixed in Tris buffer. Atomic force microscopy, Raman spectroscopy, and UV–vis absorption spectroscopy show that SWCNTs are individually dispersed and are highly n-doped in Tris buffer, which accounts for the reducing ability. Because the size of Cyt-c is significantly larger than the diameter of SWCNT, each SWCNT can be modeled as a 1D array of reacting segments. The kinetic study reveals that the early stage follows the Langmuir adsorption model, implying that each reacting segment is equivalent and reacts independently. Several hours later, a number of adsorbed Cyt-c reaches significant to change the kinetics to logarithmic. The velocity starts to decrease exponentially, indicating a high sensitivity of the 1D system to adsorption and suggesting autocatalytic adsorption. The reaction ceases after 40 h due to saturated adsorption, corresponding to a poisoning effect in catalysis.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Single-Walled Carbon Nanotube as 1D Array of Reacting Sites: Reaction Kinetics of Reduction of Cytochrome c in Tris Buffer

Nakashima

Sano

2011

J. Phys. Chem. C

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“…Another reason of much slower back reaction in comparison with the forward one is the charge transportation in SWNT. 18,23,47 When an electron is injected into the SWNT it might travel away from the donor site until it gets trapped. Therefore, in order to neutralize the positively charged dye molecule, a trapped electron has to leave the trapping site and travel along SWNT again to the closest vicinity of the dye.…”

Section: Resultsmentioning

confidence: 99%

“…17 SWNT mediated long range electron transfer has been realized by incorporating both electron donators and acceptors onto the nanotubes. 23 By decorating individual semiconducting SWNTs with titanium dioxide (TiO 2 ) nanoparticles, 24 it has been shown that electrons are injected from TiO 2 nanoparticles to SWNT under UV irradiation and they return to TiO 2 when the UV light is cut off.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotubes as photoprotectors of organic dyes: reversible photoreaction instead of permanent photo-oxidation

Long

Lin

Scheblykin

2011

Phys. Chem. Chem. Phys.

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In this paper we report that single-walled carbon nanotubes (SWNTs) can protect surface adsorbed Rhodamine B (RhB) molecules from permanent photo-oxidation via a reversible reaction. Upon strong light irradiation at 514 nm, the SWNT-adsorbed RhB molecules were switched to a non-fluorescent form, which looked like ordinary bleaching behavior. However, after staying without light for several hours the non-fluorescent dye species turned back to the original fluorescent form. This on/off switching can be considered as a reversible photobleaching process of the dye molecules. Other irreversible photochemical pathways of RhB were strongly prohibited due to the presence of SWNTs, providing the dye molecules with a high resistance against permanent photodegradation. By determining the maximum number of reconvertable RhB molecules per unit length of the nanotubes, we have further proved that this effect only works for the first layer of adsorbed dye molecules on the SWNT surfaces.

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