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Affecting an Ultra‐High Work Function of Silver
Author(s) -
He Jin,
Armstrong Jeff,
Cong Peixi,
Menagen Barak,
Igaher Lior,
Beale Andrew M.,
Etgar Lioz,
Avnir David
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201912293
Subject(s) - cysteine , adsorption , metal , chemistry , work function , molecule , zinc , hydrolysis , polar , chemical polarity , redox , inorganic chemistry , analytical chemistry (journal) , computational chemistry , organic chemistry , physics , astronomy , enzyme
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.