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Thermoelectric properties of oligoglycine molecular wires

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Thermoelectric properties of oligoglycine molecular wires. / Hou, S.; Wu, Q.; Sadeghi, H. et al.
In: Nanoscale, Vol. 11, No. 8, 28.02.2019, p. 3567-3573.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Hou, S, Wu, Q, Sadeghi, H & Lambert, CJ 2019, 'Thermoelectric properties of oligoglycine molecular wires', Nanoscale, vol. 11, no. 8, pp. 3567-3573. https://doi.org/10.1039/c8nr08878k

APA

Hou, S., Wu, Q., Sadeghi, H., & Lambert, C. J. (2019). Thermoelectric properties of oligoglycine molecular wires. Nanoscale, 11(8), 3567-3573. https://doi.org/10.1039/c8nr08878k

Vancouver

Hou S, Wu Q, Sadeghi H, Lambert CJ. Thermoelectric properties of oligoglycine molecular wires. Nanoscale. 2019 Feb 28;11(8):3567-3573. Epub 2019 Jan 2. doi: 10.1039/c8nr08878k

Author

Hou, S. ; Wu, Q. ; Sadeghi, H. et al. / Thermoelectric properties of oligoglycine molecular wires. In: Nanoscale. 2019 ; Vol. 11, No. 8. pp. 3567-3573.

Bibtex

@article{a4c23e21b518416e80e55c97af8f0232,
title = "Thermoelectric properties of oligoglycine molecular wires",
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) n Cys and Cys(Gly) n Cys molecules (where Gly, Cys represent glycine and cysteine and n = 1-3) was found to decay exponentially with length l as e -βl . 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 {\AA} -1 and 1.22 {\AA} -1 for (Gly) n Cys and Cys(Gly) n Cys respectively, while β = 0.92 {\AA} -1 for (Gly) n . We also find that replacing the peptide bond with a methylene group (-CH 2 -) increases the conductance of (Gly) 3 Cys. Furthermore, we find the (Gly) 1 Cys and Cys(Gly) 1 Cys 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) 1 Cys at room temperature, which increases further with increasing temperature, suggesting that peptide-based SAM junctions are promising candidates for thermoelectric energy harvesting.",
keywords = "Energy harvesting, Molecules, Peptides, Sulfur, Electrical conductance, Electrons and phonons, High figure of merit ZT, Increasing temperatures, Methylene groups, Molecular wires, Thermoelectric energy, Thermoelectric properties, Amino acids",
author = "S. Hou and Q. Wu and H. Sadeghi and C.J. Lambert",
year = "2019",
month = feb,
day = "28",
doi = "10.1039/c8nr08878k",
language = "English",
volume = "11",
pages = "3567--3573",
journal = "Nanoscale",
issn = "2040-3364",
publisher = "Royal Society of Chemistry",
number = "8",

}

RIS

TY - JOUR

T1 - Thermoelectric properties of oligoglycine molecular wires

AU - Hou, S.

AU - Wu, Q.

AU - Sadeghi, H.

AU - Lambert, C.J.

PY - 2019/2/28

Y1 - 2019/2/28

N2 - We have investigated the electrical and thermoelectrical properties of glycine chains with and without cysteine terminal groups. The electrical conductance of (Gly) n , (Gly) n Cys and Cys(Gly) n Cys molecules (where Gly, Cys represent glycine and cysteine and n = 1-3) was found to decay exponentially with length l as e -βl . 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) n Cys and Cys(Gly) n Cys respectively, while β = 0.92 Å -1 for (Gly) n . We also find that replacing the peptide bond with a methylene group (-CH 2 -) increases the conductance of (Gly) 3 Cys. Furthermore, we find the (Gly) 1 Cys and Cys(Gly) 1 Cys 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) 1 Cys at room temperature, which increases further with increasing temperature, suggesting that peptide-based SAM junctions are promising candidates for thermoelectric energy harvesting.

AB - We have investigated the electrical and thermoelectrical properties of glycine chains with and without cysteine terminal groups. The electrical conductance of (Gly) n , (Gly) n Cys and Cys(Gly) n Cys molecules (where Gly, Cys represent glycine and cysteine and n = 1-3) was found to decay exponentially with length l as e -βl . 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) n Cys and Cys(Gly) n Cys respectively, while β = 0.92 Å -1 for (Gly) n . We also find that replacing the peptide bond with a methylene group (-CH 2 -) increases the conductance of (Gly) 3 Cys. Furthermore, we find the (Gly) 1 Cys and Cys(Gly) 1 Cys 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) 1 Cys at room temperature, which increases further with increasing temperature, suggesting that peptide-based SAM junctions are promising candidates for thermoelectric energy harvesting.

KW - Energy harvesting

KW - Molecules

KW - Peptides

KW - Sulfur

KW - Electrical conductance

KW - Electrons and phonons

KW - High figure of merit ZT

KW - Increasing temperatures

KW - Methylene groups

KW - Molecular wires

KW - Thermoelectric energy

KW - Thermoelectric properties

KW - Amino acids

U2 - 10.1039/c8nr08878k

DO - 10.1039/c8nr08878k

M3 - Journal article

VL - 11

SP - 3567

EP - 3573

JO - Nanoscale

JF - Nanoscale

SN - 2040-3364

IS - 8

ER -