Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 8, 2019
Previous Article Next Article

Thermoelectric properties of oligoglycine molecular wires

Author affiliations

Abstract

We have investigated the electrical and thermoelectrical properties of glycine chains with and without cysteine terminal groups. The electrical conductance of (Gly)n, (Gly)nCys and Cys(Gly)nCys molecules (where Gly, Cys represent glycine and cysteine and n = 1–3) was found to decay exponentially with length l as eβl. Our results show that connecting the molecules to gold electrodes via the sulphur atom of the cysteine moiety leads to higher β factors of 1.57 Å−1 and 1.22 Å−1 for (Gly)nCys and Cys(Gly)nCys respectively, while β = 0.92 Å−1 for (Gly)n. We also find that replacing the peptide bond with a methylene group (–CH2–) increases the conductance of (Gly)3Cys. Furthermore, we find the (Gly)1Cys and Cys(Gly)1Cys systems show good thermoelectrical performance, because of their high Seebeck coefficients (∼0.2 mV K−1) induced by the sulphur of the cysteine(s). With the contributions of both electrons and phonons taken into consideration, a high figure of merit ZT = 0.8 is obtained for (Gly)1Cys at room temperature, which increases further with increasing temperature, suggesting that peptide-based SAM junctions are promising candidates for thermoelectric energy harvesting.

Graphical abstract: Thermoelectric properties of oligoglycine molecular wires

Back to tab navigation

Supplementary files

Article information


Submitted
05 Nov 2018
Accepted
29 Dec 2018
First published
02 Jan 2019

This article is Open Access

Nanoscale, 2019,11, 3567-3573
Article type
Paper

Thermoelectric properties of oligoglycine molecular wires

S. Hou, Q. Wu, H. Sadeghi and C. J. Lambert, Nanoscale, 2019, 11, 3567
DOI: 10.1039/C8NR08878K

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
  • For reproduction of material from PCCP:
    [Original citation] - Published by the PCCP Owner Societies.
  • For reproduction of material from PPS:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
  • For reproduction of material from all other RSC journals:
    [Original citation] - Published by The Royal Society of Chemistry.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.


Social activity

Search articles by author

Spotlight

Advertisements