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Stable-radicals increase the conductance and Seebeck coefficient of graphene nanoconstrictions

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>28/10/2018
<mark>Journal</mark>Nanoscale
Issue number40
Volume10
Number of pages4
Pages (from-to)19220-19223
Publication statusPublished
Early online date3/10/18
Original languageEnglish

Abstract

Nanoscale thermoelectricity is an attractive target technology, because it can convert ambient heat into electricity for powering embedded devices in the internet of things. We demonstrate that the thermoelectric performance of graphene nanoconstrictions can be significantly enhanced by the presence of stable radical adsorbates, because radical molecules adsorbed on the graphene nanoconstrictions create singly-occupied orbitals in the vicinity of Fermi energy. This in turn leads to sharp features in their transmission functions close to Fermi energy, which increases the electrical conductance and Seebeck coefficient of the nanoconstrictions. This is a generic feature of radical adsorbates and can be employed in the design of new thermoelectric devices and materials.