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Gold nanoparticles assembled with dithiocarbamate-anchored molecular wires

Reeler, Nini E.A.; Lerstrup, Knud A.; Somerville, Walter; Speder, Jozsef; Petersen, Søren V.; Laursen, Bo W.; Arenz, Matthias; Qiu, Xiaohui; Vosch, Tom; Nørgaard, Kasper

Authors

Nini E.A. Reeler

Knud A. Lerstrup

Walter Somerville

Jozsef Speder

Søren V. Petersen

Bo W. Laursen

Matthias Arenz

Xiaohui Qiu

Tom Vosch

Kasper Nørgaard



Abstract

A protocol for the bottom-up self-assembly of nanogaps is developed through molecular linking of gold nanoparticles (AuNPs). Two €-conjugated oligo(phenylene ethynylene) molecules (OPE) with dithiocarbamate anchoring groups are used as ligands for the AuNPs. OPE-4S with a dithiocarbamate in each end of the molecule and a reference molecule OPE-2S with only a single dithiocarbamate end group. The linking mechanism of OPE-4S is investigated by using a combination of TEM, UV-Vis absorption and surface enhanced Raman spectroscopy (SERS) as well as studying the effect of varying the OPE-4S to AuNP concentration ratio. UV-Vis absorption confirms the formation of AuNP aggregates by the appearance of an extended plasmon band (EPB) for which the red shift and intensity depend on the OPE-4S:AuNP ratio. SERS confirms the presence of OPE-4S and shows a gradual increase of the signal intensity with increasing OPE-4S:AuNP ratios up to a ratio of about 4000, after which the SERS intensity does not increase significantly. For OPE-2S, no linking is observed below full coverage of the AuNPs indicating that the observed aggregate formation at high OPE-2S:AuNP ratios, above full AuNP coverage, is most likely of a physical nature (van der Waals forces or €-€ interactions).

Journal Article Type Article
Publication Date Oct 16, 2015
Journal Scientific Reports
Print ISSN 2045-2322
Electronic ISSN 2045-2322
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 5
Issue 1
Article Number 15273
APA6 Citation Reeler, N. E., Lerstrup, K. A., Somerville, W., Speder, J., Petersen, S. V., Laursen, B. W., …Nørgaard, K. (2015). Gold nanoparticles assembled with dithiocarbamate-anchored molecular wires. Scientific reports, 5(1), doi:10.1038/srep15273
DOI https://doi.org/10.1038/srep15273
Publisher URL https://www.nature.com/articles/srep15273
Copyright Statement This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Copyright Statement
This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/





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