High electrical conductivity and n-type thermopower from double-/single-wall carbon nanotubes by manipulating charge interactions between nanotubes and organic/inorganic nanomaterials

Electronic-type-separated SWCNTs thin-films were used to demonstrate that the strength of the redox potential of dopants influences their electrical conductivity enhancement.

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Flexible thermoelectric films formed using integrated nanocomposites with single-wall carbon nanotubes and Bi2Te3 nanoplates via solvothermal synthesis

Scientific Reports ◽

10.1038/s41598-020-73808-4 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Hayato Yabuki ◽

Susumu Yonezawa ◽

Rikuo Eguchi ◽

Masayuki Takashiri

Keyword(s):

Carbon Nanotubes ◽

Electrical Conductivity ◽

Solvothermal Synthesis ◽

High Performance ◽

Nanocomposite Films ◽

Single Wall Carbon Nanotubes ◽

High Electrical Conductivity ◽

Single Wall Carbon ◽

Maximum Power Factor ◽

Flexible Thermoelectric

Abstract Single-wall carbon nanotubes (SWCNTs) and Bi2Te3 nanoplates are very promising thermoelectric materials for energy harvesting. When these two materials are combined, the resulting nanocomposites exhibit high thermoelectric performance and excellent flexibility. However, simple mixing of these materials is not effective in realizing high performance. Therefore, we fabricated integrated nanocomposites by adding SWCNTs during solvothermal synthesis for the crystallization of Bi2Te3 nanoplates and prepared flexible integrated nanocomposite films by drop-casting. The integrated nanocomposite films exhibited high electrical conductivity and an n-type Seebeck coefficient owing to the low contact resistance between the nanoplates and SWCNTs. The maximum power factor was 1.38 μW/(cm K2), which was 23 times higher than that of a simple nanocomposite film formed by mixing SWCNTs during drop-casting, but excluding solvothermal synthesis. Moreover, the integrated nanocomposite films maintained their thermoelectric properties through 500 bending cycles.

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Modification of Electrical and Mechanical Properties of Single Wall Carbon Nanotubes by Reaction with SOCl2

MRS Proceedings ◽

10.1557/proc-772-m3.1 ◽

2003 ◽

Vol 772 ◽

Cited By ~ 2

Author(s):

Urszula Dettlaff-Weglikowska ◽

Viera Skakalova ◽

Ralf Graupner ◽

Lothar Ley ◽

Siegmar Roth

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Electrical Conductivity ◽

Functional Groups ◽

Carboxyl Groups ◽

Single Wall Carbon Nanotubes ◽

Chemical Methods ◽

Chemical Functionalization ◽

Single Wall Carbon ◽

Bucky Paper

AbstractAttaching chemical functional groups to single wall carbon nanotubes (SWNTs) has been achieved by chemical methods. Oxidized purified nanotubes have been treated by thionyl chloride in order to convert carboxyl groups into acylchloride groups. We observe by XPS and EDX that not only chlorine atoms but sulphur containing functional groups are covalently bound to the nanotubes. This chemical functionalization also causes significant changes in the electrical and mechanical properties of the nanotubes. The electrical conductivity measured on mats (bucky paper) increases from 500 S/cm in pristine tubes to 2500 S/cm in modified tubes. Similarly, the Young's modulus of bucky paper increases by about 100 %.

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