Surfactant‐driven Amphoteric Doping of Carbon Nanotubes

Nonoguchi, Yoshiyuki; Tani, Atsushi; Murayama, Tomoko; Uchida, Hideki; Kawai, Tsuyoshi

doi:10.1002/asia.201801490

Cited by 13 publications

(10 citation statements)

References 42 publications

(108 reference statements)

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“…As a result, the surfactant that resulted in the suppression of thermal conductivity while maintaining C-Dps coverage is responsible for the improvement of thermoelectric properties in the CNT yarn using method D. Since the dispersion of CNTs was not successful only with the surfactant in the spinning process (similar to method A), a combinational effect of hydrophobic ILs that disperse the CNT in the liquid phase and amphiphilic surfactant, which can prevent the reunion of CNT bundles during the exchange of IL with water, could be effective to keep CNTs untangled. On the other hand, because of this unintentional carrier doping by surfactant and air, the power factor and ZT obtained in this study may not be the maximum one. Doping control is, therefore, necessary in future work.…”

Section: Resultsmentioning

confidence: 67%

Carbon Nanotube/Biomolecule Composite Yarn for Wearable Thermoelectric Applications

Cho

Okamoto

Yamamoto

et al. 2022

ACS Appl. Energy Mater.

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In this work, yarn made of a hybrid material of carbon nanotubes (CNTs) and artificial biomolecules is created for the wearable thermoelectric (TE) module. Among the limited methods due to the sensitivity of proteins, the co-use of the ionic liquid and polymeric surfactant with the dialysis method is found to be effective for the dispersion of the CNT/biomolecule composite with a low CNT loss rate and high coverage by biomolecules on the CNT. This new method improved the TE performance by decreasing the bundle diameter of the CNT/C-Dps nanocomposite and better tensile strength. The incorporation of a biomolecule, in particular, significantly reduced the thermal conductivity of CNT yarns, demonstrating that the hybrid composite is advantageous for wearable device applications. This method also outperformed the conventional dispersion against the pristine CNT yarn (without protein), demonstrating the application’s generality. Finally, a low-density testing of the TE module using the CNT/biomolecule composite is demonstrated, exhibiting the output power of 4.37 μW m–2 with a thermoelectric voltage of 4.5 mV at a temperature difference of 20 K. The output power density and voltage can be easily increased 500-fold by increasing the density of the yarn and the number of series connections. This study proposes a practical method for producing an environment-friendly CNT/biomolecule hybrid yarn, which has the potential to be useful in future wearable TE applications.

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Section: Resultsmentioning

confidence: 67%

Carbon Nanotube/Biomolecule Composite Yarn for Wearable Thermoelectric Applications

Cho

Okamoto

Yamamoto

et al. 2022

ACS Appl. Energy Mater.

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“…Furthermore, weaker electron donors were used to achieve n-type characteristics from SWCNT films, including neutral surfactants (e.g. Pluronic PEG-type polymers, and polyvinylpyrrolidone (PVP)) [27], and simple electron-donating polymers (e.g. poly(vinyl alcohol) and poly(vinyl acetate)) [28].…”

Section: Electron Transfer-type Dopantsmentioning

confidence: 99%

Molecular electron doping to single-walled carbon nanotubes and molybdenum disulfide monolayers

2022

Self Cite

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Carrier doping is an essential way to modulate the transport properties of electronic materials. While the substitution of heteroatoms essentially modulates the band structure of most semiconducting materials, chemical (molecular) doping can achieve relatively reliable carrier concentration modulation, particularly for nanocarbons and two-dimensional semiconductors. Compared to p-type counterparts, the stabilization of n-type carbon materials has been a challenge not only for basic science but also for various electronic device applications. This Mini-Review describes rational concepts for, and the results of, a stable n-type doping technique mainly for carbon nanotubes using molecular reactions and interactions. The stable n-type carbon nanotubes with controlled carrier concentration are implemented in complementary circuits and thermoelectric energy harvesters. The molecular and supramolecular n-type doping is not limited for carbon nanotubes, but is utilized in the fabrication of conducting transition metal dichalcogenides such as a molybdenum disulphide (MoS2) monolayer.

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“…The use of surfactants to suspend SWCNTs has since expanded to include other anionic, cationic, and non-ionic surfactants (Hirsch, 2002; Wenseleers et al, 2004; Crochet et al, 2007; Haggenmueller et al, 2008; Blanch et al, 2010; Bergler et al, 2016; Nonoguchi et al, 2018), such as sodium cholate (SC), sodium deoxycholate (SDOC), sodium dodecylbenzenesulfonate (SDBS), lithium dodecyl sulfate (LDS), Triton X-100, and pluronic F127. Depending on the surfactant, high-quality dispersions can be achieved with large populations of individualized nanotubes (Coleman, 2009) and SWCNT concentrations >1 mg/mL.…”

Section: Surfactant-coated Swcntsmentioning

confidence: 99%

Non-covalent Methods of Engineering Optical Sensors Based on Single-Walled Carbon Nanotubes

Gillen

Boghossian

2019

Front. Chem.

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Optical sensors based on single-walled carbon nanotubes (SWCNTs) demonstrate tradeoffs that limit their use in in vivo and in vitro environments. Sensor characteristics are primarily governed by the non-covalent wrapping used to suspend the hydrophobic SWCNTs in aqueous solutions, and we herein review the advantages and disadvantages of several of these different wrappings. Sensors based on surfactant wrappings can show enhanced quantum efficiency, high stability, scalability, and diminished selectivity. Conversely, sensors based on synthetic and bio-polymer wrappings tend to show lower quantum efficiency, stability, and scalability, while demonstrating improved selectivity. Major efforts have focused on optimizing sensors based on DNA wrappings, which have intermediate properties that can be improved through synthetic modifications. Although SWCNT sensors have, to date, been mainly engineered using empirical approaches, herein we highlight alternative techniques based on iterative screening that offer a more guided approach to tuning sensor properties. These more rational techniques can yield new combinations that incorporate the advantages of the diverse nanotube wrappings available to create high performance optical sensors.

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Surfactant‐driven Amphoteric Doping of Carbon Nanotubes

Cited by 13 publications

References 42 publications

Carbon Nanotube/Biomolecule Composite Yarn for Wearable Thermoelectric Applications

Carbon Nanotube/Biomolecule Composite Yarn for Wearable Thermoelectric Applications

Molecular electron doping to single-walled carbon nanotubes and molybdenum disulfide monolayers

Non-covalent Methods of Engineering Optical Sensors Based on Single-Walled Carbon Nanotubes

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