Institute of Chemistry and The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, 9190401, Israel.
ISIS Facility, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire, OX11 0QX, UK.
Angew Chem Int Ed Engl. 2020 Mar 16;59(12):4698-4704. doi: 10.1002/anie.201912293. Epub 2020 Jan 30.
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) , 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.
据报道，银的 WF 从 4.26 增加到 7.42 eV，增幅高达 3.1 eV。这是金属记录到的最高 WF 增加，得到了最近的计算研究的支持，这些研究预测了通过超过 4 eV 增加金属 WF 的潜在能力。我们通过一种新的方法实现了超高的增加：不是使用极性分子层在金属表面上的常见二维吸附方法，而是将 WF 修饰成分 L-半胱氨酸和 Zn(OH) 嵌入金属中，形成 3D 结构。通过大量的分析方法进行了详细的材料表征，这些方法的结合表明了一种 WF 增强机制，该机制基于通过半胱氨酸和水解锌(II)分别直接影响金属的电荷转移能力，并通过众所周知的 Zn-半胱氨酸指状氧化还原陷阱效应通过两者的组合协同作用。
