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Thermally Stable and Highly Conductive SAMs on Ag Substrate—The Impact of the Anchoring Group
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-01-06 , DOI: 10.1002/aelm.202000947 Mateusz Wróbel 1 , Tomasz Żaba 1 , Eric Sauter 2 , Mariusz Krawiec 3 , Joanna Sobczuk 1 , Andreas Terfort 4, 5 , Michael Zharnikov 2 , Piotr Cyganik 1
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2021-01-06 , DOI: 10.1002/aelm.202000947 Mateusz Wróbel 1 , Tomasz Żaba 1 , Eric Sauter 2 , Mariusz Krawiec 3 , Joanna Sobczuk 1 , Andreas Terfort 4, 5 , Michael Zharnikov 2 , Piotr Cyganik 1
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Self‐assembled monolayers (SAMs) on metal substrates are an important part of modern interfacial chemistry and nanotechnology. The robustness of SAMs strongly depends on their thermal stability, which, together with electric conductivity, crucial for their applications in molecular/organic electronics. In this context, using a multidisciplinary approach, the structure, stability, and conductivity properties of conjugated aromatic SAMs featuring the naphthalene backbone and S, Se, or COO group, mediating bonding to the Ag substrate are addressed. Whereas thermal stability of these SAMs exhibits a strong dependence on anchoring group, their conductivity is similar, which is rationalized by tentative model considering redistribution of charge density along the molecular framework. The thermal stability of model naphthalenethiol SAM, emphasized by desorption energy of ≈1.69 eV, is better than that of typical N‐heterocyclic carbene (NHC) monolayers considered currently as the most stable SAMs on metal substrates. However, in contrast to NHC SAMs, which are highly insulating, the naphtalene‐based SAM, with S, Se or COO anchoring groups, are highly conductive, even in comparison with analogous oligophenyl SAMs (by a factor of 10). A unique combination of the ultimate thermal stability and superior conductivity for the naphthalenethiol SAM on Ag makes it highly attractive for applications.
中文翻译：
Ag基板上的热稳定和高导电性SAM——锚定基团的影响
金属基底上的自组装单分子膜（SAMs）是现代界面化学和纳米技术的重要组成部分。SAM的坚固性在很大程度上取决于其热稳定性，而热稳定性以及导电性对于它们在分子/有机电子学中的应用至关重要。在这种情况下，采用多学科方法，结构，稳定性，和共轭芳族的SAM特色的萘骨架和S的导电性能，硒，或COO 讨论了介导与Ag基底的键合。这些SAM的热稳定性表现出对锚固基团的强烈依赖性，但它们的电导率却相似，这是通过考虑电荷密度沿分子框架的重新分布的暂定模型进行合理化的。萘硫醇模型SAM的热稳定性（由约1.69 eV的解吸能所强调）优于目前被认为是金属基材上最稳定的SAMs的典型N杂环卡宾（NHC）单层。但是，与高度绝缘的NHC SAM相比，带有S，Se或COO的萘型SAM甚至与类似的低聚苯基SAM相比（10倍），这些固定基团也具有很高的导电性。Ag上的萘硫醇SAM具有极佳的热稳定性和优异的导电性的独特组合，使其在应用中极具吸引力。
更新日期：2021-02-15
中文翻译：
Ag基板上的热稳定和高导电性SAM——锚定基团的影响
金属基底上的自组装单分子膜（SAMs）是现代界面化学和纳米技术的重要组成部分。SAM的坚固性在很大程度上取决于其热稳定性，而热稳定性以及导电性对于它们在分子/有机电子学中的应用至关重要。在这种情况下，采用多学科方法，结构，稳定性，和共轭芳族的SAM特色的萘骨架和S的导电性能，硒，或COO 讨论了介导与Ag基底的键合。这些SAM的热稳定性表现出对锚固基团的强烈依赖性，但它们的电导率却相似，这是通过考虑电荷密度沿分子框架的重新分布的暂定模型进行合理化的。萘硫醇模型SAM的热稳定性（由约1.69 eV的解吸能所强调）优于目前被认为是金属基材上最稳定的SAMs的典型N杂环卡宾（NHC）单层。但是，与高度绝缘的NHC SAM相比，带有S，Se或COO的萘型SAM甚至与类似的低聚苯基SAM相比（10倍），这些固定基团也具有很高的导电性。Ag上的萘硫醇SAM具有极佳的热稳定性和优异的导电性的独特组合，使其在应用中极具吸引力。
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