Effect of multiwalled carbon nanotubes on the thermoelectric properties of a bismuth telluride matrix

Bark, Hyunwoo; J, Kim; Kim, Heesuk; Yim, Ju-Hyuk; Lee, Hyunjung

doi:10.1016/j.cap.2013.01.019

Cited by 46 publications

(15 citation statements)

References 15 publications

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“…We believe that the drop casting process contributed to the stability of the n-type Seebeck coefficient in the SWCNT films. To demonstrate it, we prepared an SWCNT film with SDBS using the vacuum filtration process, which is a typical method for fabricating CNT films [42][43][44] , and compared the stability of the Seebeck coefficients in the two film-preparation methods. Figure 5 shows the chronological change in the Seebeck coefficient of SWCNT films prepared using drop casting and vacuum filtration.…”

Section: Stability Of N-type Seebeck Coefficient In Swcnt Films With mentioning

confidence: 99%

Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Seki

Nagata

Takashiri

2020

Sci Rep

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thermoelectric generators based on single-wall carbon nanotubes (SWcnts) have great potential for use in wearable and skin electronics because of their lightweight and mechanically soft structure. However, the fabrication of air-stable n-type thermoelectric SWcnts using conventional processes is challenging. Herein, we propose a facile process for fabricating air-stable n-type SWCNT films with anionic surfactants via drop casting followed by heat treatment. We examined different surfactants (Sodium Dodecyl Sulfate, Sodium Dodecylbenzene Sulfonate, and Sodium cholate) and heat-treatment temperatures. The optimal SWCNT film maintained the n-type Seebeck coefficient for 35 days. Moreover, to further extend the n-type Seebeck coefficient maintenance, we periodically reheated the SWCNT film with a surfactant that had returned to the p-type Seebeck coefficient. The reheated film recovered the n-type Seebeck coefficient, and the effect of the reheating treatment lasted for several reheating cycles. finally, we elucidated a simple mechanism for realizing an air-stable n-type Seebeck coefficient based on spectroscopic analyses of the SWCNT films.

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Section: Stability Of N-type Seebeck Coefficient In Swcnt Films With mentioning

confidence: 99%

Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Seki

Nagata

Takashiri

2020

Sci Rep

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“…[10] Attempts have been made to improve the ZT,s uch as the synthesis of new materials using different techniques, the deposition of thin films of material and the preparation of low-dimensional materials. [11][12][13][14] Thed eposition of thin films of material reduces the dimensionalityo f the material and decreasest he thermal conductivity to lead to an enhancementi nZ T. [15] In the aforementioned attempts, the incorporation or dopingo ft he material and the deposition of thin films were efficient approaches to achieve better ZT valuesb ecause they improve the optostructural, morphological, compositional and electrical transport properties.T he depositiono ft hin films and the measurement of their electrical properties are feasible and this requires less energy than the deposition of bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric Properties of Indium(III)‐Doped Copper Antimony Selenide Thin Films Deposited Using a Microwave‐Assisted Technique

et al. 2016

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The improvement of the thermoelectric performance of semiconducting chalcogenides is an important task. The principal challenge in this field is to tailor the thermoelectric properties, such as electrical conductivity, Seebeck coefficient, and thermal conductivity, to improve the figure of merit (ZT). Herein, we present an improvement in the thermoelectric properties of InIII‐doped p‐type Cu3SbSe4 thin films deposited by using a microwave‐assisted technique. The deposited thin films were characterized for their optical, structural, morphological, compositional, and electrical transport properties to show the applicability of the materials in thermoelectric energy conversion. The improvement in ZT is achieved with InIII doping because of the enhancement in the charge carrier density of Cu3SbSe4 thin films. A maximum ZT of 0.183 was achieved for Cu3(Sb0.94In0.06)Se4 at 300 K. Our results show that this deposition strategy and doping process can provide an effective solution to fabricate Cu3SbSe4‐based materials for thermoelectric applications.

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“…When the MWNT content was increased from 7 to 15, 25, and 35 wt.%, the Seebeck coefficient changed from 302.7 to 324.45, 132.14 and 64.21 μV/K, respectively. As mentioned in the literature, the Seebeck coefficient was affected by the charge carrier concentration and the high oxygen amount of the carboxylated MWNTs acted as a p -dopant, facilitating the electron withdrawal from the MWNTs backbone and resulting in an increase in the Seebeck coefficient [42,43,44]. Therefore, the PVDF/MWNTs composite with 15 wt.% of MWNTs exhibits high Seebeck coefficient of about 324.45 μV/K at room temperature.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Porous Polyvinylidene Fluoride/Multi-Walled Carbon Nanotube Nanocomposites and Their Enhanced Thermoelectric Performance

Qiao

et al. 2018

Polymers

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Abstract:In this paper, a solvent vapor-induced phase separation (SVIPS) technique was used to create a porous structure in polyvinylidene fluoride/Multi-walled carbon nanotube (PVDF/MWNTs) composites with the aim of increasing the electrical conductivity through the incorporation of MWNTs while retaining a low thermal conductivity. By using the dimethylformamide/acetone mixture, porous networks could be generated in the PVDF/MWNTs composites upon the rapid volatilization of acetone. The electrical conductivity was gradually enhanced by the addition of MWNTs. At the same time, the thermal conductivity of the PVDF film could be retained at 0.1546 W·m −1 ·K −1 due to the porous structure being even by loaded with a high content of MWNTs (i.e., 15 wt.%). Thus, the Seebeck coefficient, power factor and figure of merit (ZT) were subsequently improved with maximum values of 324.45 µV/K, 1.679 µW·m −1 ·K −2 , and 3.3 × 10 −3 , respectively. The microstructures, thermal properties, and thermoelectric properties of the porous PVDF/MWNTs composites were studied. It was found that the enhancement of thermoelectric properties would be attributed to the oxidation of MWNTs and the porous structure of the composites. The decrease of thermal conductivity and the increase of Seebeck coefficient were induced by the phonon scattering and energy-filtering effect. The proposed method was found to be facile and effective in creating a positive effect on the thermoelectric properties of composites.

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Effect of multiwalled carbon nanotubes on the thermoelectric properties of a bismuth telluride matrix

Cited by 46 publications

References 15 publications

Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Thermoelectric Properties of Indium(III)‐Doped Copper Antimony Selenide Thin Films Deposited Using a Microwave‐Assisted Technique

Fabrication of Porous Polyvinylidene Fluoride/Multi-Walled Carbon Nanotube Nanocomposites and Their Enhanced Thermoelectric Performance

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