Jump to main content
Jump to site search

Issue 41, 2015
Previous Article Next Article

Increasing the thermopower of crown-ether-bridged anthraquinones

Author affiliations

Abstract

We investigate strategies for increasing the thermopower of crown-ether-bridged anthraquinones. The novel design feature of these molecules is the presence of either (1) crown-ether or (2) diaza-crown-ether bridges attached to the side of the current-carrying anthraquinone wire. The crown-ether side groups selectively bind alkali-metal cations and when combined with TCNE or TTF dopants, provide a large phase-space for optimising thermoelectric properties. We find that the optimum combination of cations and dopants depends on the temperature range of interest. The thermopowers of both 1 and 2 are negative and at room temperature are optimised by binding with TTF alone, achieving thermpowers of −600 μV K−1 and −285 μV K−1 respectively. At much lower temperatures, which are relevant to cascade coolers, we find that for 1, a combination of TTF and Na+ yields a maximum thermopower of −710 μV K−1 at 70 K, whereas a combination of TTF and Li+ yields a maximum thermopower of −600 μV K−1 at 90 K. For 2, we find that TTF doping yields a maximum thermopower of −800 μV K−1 at 90 K, whereas at 50 K, the largest thermopower (of −600 μV K−1) is obtain by a combination TTF and K+ doping. At room temperature, we obtain power factors of 73 μW m−1 K−2 for 1 (in combination with TTF and Na+) and 90 μW m−1 K−2 for 2 (with TTF). These are higher or comparable with reported power factors of other organic materials.

Graphical abstract: Increasing the thermopower of crown-ether-bridged anthraquinones

Back to tab navigation

Supplementary files

Publication details

The article was received on 22 Jul 2015, accepted on 23 Sep 2015 and first published on 25 Sep 2015


Article type: Paper
DOI: 10.1039/C5NR04907E
Author version
available:
Download author version (PDF)
Citation: Nanoscale, 2015,7, 17338-17342
  •   Request permissions

    Increasing the thermopower of crown-ether-bridged anthraquinones

    A. K. Ismael, I. Grace and C. J. Lambert, Nanoscale, 2015, 7, 17338
    DOI: 10.1039/C5NR04907E

Search articles by author

Spotlight

Advertisements