Abstract
Pd nanoparticles can cover the defects of carbon nanotubes by a chemical reduction, which results in an increased carrier transport, then a high thermoelectric figure-of-merit, ZT = 0.3, in the sheets of the defect-repaired carbon nanotubes.
Highlights
The as-prepared SWCNTs are mixtures, separation and purification techniques have been developed establishing the SWCNTs as a versatile electronic material and providing high-performance applications, such as transistors,[8] biological imaging fluorophores,[9] photovoltaics,[10] etc
The scanning electron microscopy (SEM) images of the sheets prepared from the super-growth CNT (SGCNT) covered by the Pd black and separately-prepared palladium nanoparticles (Pd NPs) (Fig. S2b and c, Electronic supplementary information (ESI),† respectively) suggested that the Pd black NPs were aggregated on the surface of the SGCNTs, while the separately prepared Pd NPs were more separately and homogeneously deposited on the SGCNTs than the Pd black NPs
The TE properties (Seebeck coefficient (S), electrical conductivity (s), and TE power factor (PF = S2s)) for the SGCNT sheets covered with Pd black and separately-prepared Pd NPs were measured
Summary
The as-prepared SWCNTs are mixtures, separation and purification techniques have been developed establishing the SWCNTs as a versatile electronic material and providing high-performance applications, such as transistors,[8] biological imaging fluorophores,[9] photovoltaics,[10] etc. Nanomaterials, especially SWCNTs, have attracted increasing attention as organic and/or hybrid thermoelectric (TE) materials, too,[11,12,13,14,15,16,17,18,19] which are essential for developing TE devices for harvesting electrical energy from low-grade waste heat[20] as well as for the so-called ‘‘IoT.’’21 a single CNT has a high thermal conductivity, a randomly assembled CNT sheet or network has a much lower thermal conductivity than that of the single CNT due to phonon scattering at the interfaces of the CNTs in the CNT sheets, but maintains a high electrical conductivity.[22] the CNT sheets have a significant potential to be used in TE devices. There have been many reports about the electronical conductivity and Seebeck coefficient of the sheets of various SWCNTs.[15]. The electrical conductivity and Seebeck coefficient of the SWCNT depend on its diameter, chirality, and doping.[13,15] separation and purification are necessary to obtain the CNT with a high
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