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Affecting an Ultra‐High Work Function of Silver

He, J; Armstrong, J; Cong, P; Menagen, B; Igaher, L; Beale, AM; Etgar, L; (2020) Affecting an Ultra‐High Work Function of Silver. Angewandte Chemie 10.1002/ange.201912293. (In press).

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Abstract

An ultra‐high increase in the WF of silver, from 4.26 to 7.42 eV, that is, an increase of up to circa 3.1 eV is reported. This is the highest WF increase on record for metals and is supported by recent computational studies which predict the potential ability to affect an increase of the WF of metals by more than 4 eV. We achieved the ultra‐high increase by a new approach: Rather than using the common method of 2D adsorption of polar molecules layers on the metal surface, WF modifying components, l‐cysteine and Zn(OH)_{2}, were incorporated within the metal, resulting in a 3D architecture. Detailed material characterization by a large array of analytical methods was carried out, the combination of which points to a WF enhancement mechanism which is based on directly affecting the charge transfer ability of the metal separately by cysteine and hydrolyzed zinc(II), and synergistically by the combination of the two through the known Zn‐cysteine finger redox trap effect.

Type: Article
Title: Affecting an Ultra‐High Work Function of Silver
DOI: 10.1002/ange.201912293
Publisher version: https://doi.org/10.1002/ange.201912293
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Metalldotierung, Kelvin-Sonde, Redoxfallen-Effekt, Silber, Austrittsarbeit
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10092497
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