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Thermally stable and highly conductive SAMs on Ag substrate: the impact of the anchoring group

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 electroni...

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Main Authors: Wróbel, Mateusz (Author) , Żaba, Tomasz (Author) , Sauter, Eric (Author) , Krawiec, Mariusz (Author) , Sobczuk, Joanna (Author) , Terfort, Andreas (Author) , Zharnikov, Michael (Author) , Cyganik, Piotr (Author)
Format: Article (Journal)
Language:English
Published: 2021
In: Advanced electronic materials
Year: 2021, Volume: 7, Issue: 2, Pages: 1-13
ISSN:2199-160X
DOI:10.1002/aelm.202000947
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1002/aelm.202000947
Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/aelm.202000947
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Author Notes:Mateusz Wróbel, Tomasz Żaba, Eric Sauter, Mariusz Krawiec, Joanna Sobczuk, Andreas Terfort, Michael Zharnikov, and Piotr Cyganik
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Summary: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.
Item Description:Gesehen am 17.04.2023
Physical Description:Online Resource
ISSN:2199-160X
DOI:10.1002/aelm.202000947

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