Effect of chemical treatment on the thermoelectric properties of single walled carbon nanotube networks

Mingxing Piao, Mina Rastegar Alam, Gyutae Kim, Urszula Dettlaff-Weglikowska, Siegmar Roth

    Research output: Contribution to journalArticlepeer-review

    47 Citations (Scopus)

    Abstract

    Carbon nanotube networks showing superior electric properties, high chemical stability, strong mechanical properties, and flexibility are also known to exhibit thermoelectric effects. However, the experimental thermoelectric figure of merit, ZT, of pristine carbon nanotubes is typically in the range of 10-3-10-2, which is still not attractive for thermal energy conversion applications. In this work, we show possible ways to improve the thermoelectric properties of single walled carbon nanotubes (SWCNTs) by means of chemical treatments. In this study, we primarily investigated the effect of chemical treatment on the electrical conductivity and thermoelectric power (TEP) of the entangled network of nanotubes, also, known as "buckypaper". This chemical treatment increased the electrical conductivity due to p-type doping, thereby, showing a decrease in the TEP given by the Seebeck coefficient, whereas the n-type dopants changed the sign and value of the TEP from about 40 to -40μVK-1. Neutral polymers, in terms of doping, such as PVDF, PMMA, PVA, PS, and PC, were expected to hinder phonon transport through the nanotube network, increasing the Seebeck coefficient up to ca. 50μVK-1. Our results reveal the importance of chemical doping determining the sign and the magnitude of the TEP, and role of the polymer matrix in the development of more effective thermoelectric composites based on carbon nanotubes.

    Original languageEnglish
    Pages (from-to)2353-2356
    Number of pages4
    JournalPhysica Status Solidi (B) Basic Research
    Volume249
    Issue number12
    DOIs
    Publication statusPublished - 2012 Dec

    Keywords

    • Chemical treatment
    • Electrical conductivity
    • SWCNTs network
    • Seebeck coefficient

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Fingerprint

    Dive into the research topics of 'Effect of chemical treatment on the thermoelectric properties of single walled carbon nanotube networks'. Together they form a unique fingerprint.

    Cite this