Does the Seebeck coefficient of a single-molecule junction depend on the junction configuration?

0580138 - FZÚ 2024 RIV GB eng J - Článek v odborném periodiku
Vavrek, F. - Butsyk, Olena - Kolivoška, V. - Nováková Lachmanová, Š. - Sebechlebská, T. - Šebera, J. - Gasior, J. - Mészáros, G. - Hromadová, M.
Does the Seebeck coefficient of a single-molecule junction depend on the junction configuration?
Journal of Materials Chemistry A. Roč. 9, č. 32 (2021), s. 17512-17520. ISSN 2050-7488. E-ISSN 2050-7496
Institucionální podpora: RVO:68378271
Klíčová slova: thermoelectric properties * thermopower measurements * electronic structure * charge transport * conductance * length * benzenedithiol
Obor OECD: Physical chemistry
Impakt faktor: 14.511, rok: 2021
Způsob publikování: Omezený přístup
https://doi.org/10.1039/d1ta05324h

A new experimental method based on dynamic switching between (thermo)electric and thermoelectric voltage measurements. Two model systems, 4,40-bipyridine (1) and 4,40 -diaminostilbene (2), have been scrutinized. Single-molecule conductance (G) and thermopower (S) values were obtained for the two most prob. junction config. of 1 and 2, each having two different conductance values, GH (high) and GL (low), where GH > GL. Thermopower values of S(GH) ¼ 6.4 1.5 mV K1 and S(GL) ¼ 7.0 1.6 mV K1 were obtained for the molecular junctions of 1 and values of S(GH) ¼ +14.4 3.5 mV K1 and S(GL) ¼ +10.4 3.0 mV K1 were obtained for the molecular junctions of 2. The GH and S(GH) values for 1 and 2 are consistent with previously reported results. Thermopower values obtained for both configurations of 2 during junction evolution are reported for the first time. This work shows that both S values are the same for each molecule and they do not depend on the molecular junction configuration.
Trvalý link: https://hdl.handle.net/11104/0348904