The influence of molecular mobility on the properties of networks of gold nanoparticles and organic ligands
Artikel i vetenskaplig tidskrift, 2014

We prepare and investigate two-dimensional (2D) single-layer arrays and multilayered networks of gold nanoparticles derivatized with conjugated hetero-aromatic molecules, i.e., S-(4-{[2,6-bipyrazol-1-yl)pyrid-4-yl]ethynyl}phenyl) thiolate (herein S-BPP), as capping ligands. These structures are fabricated by a combination of self-assembly and microcontact printing techniques, and are characterized by electron microscopy, UV-visible spectroscopy and Raman spectroscopy. Selective binding of the S-BPP molecules to the gold nanoparticles through Au-S bonds is found, with no evidence for the formation of N-Au bonds between the pyridine or pyrazole groups of BPP and the gold surface. Subtle, but significant shifts with temperature of specific Raman S-BPP modes are also observed. We attribute these to dynamic changes in the orientation and/or increased mobility of the molecules on the gold nanoparticle facets. As for their conductance, the temperature-dependence for S-BPP networks differs significantly from standard alkanethiol-capped networks, especially above 220 K. Relating the latter two observations, we propose that dynamic changes in the molecular layers effectively lower the molecular tunnel barrier for BPP-based arrays at higher temperatures.

gold nanoparticles

aromatic capping ligands

molecular charge transport

surface enhanced Raman spectroscopy



E. J. Devid

Universiteit Leiden

P. N. Martinho

Universidade de Lisboa

Karlsruher Institut für Technologie (KIT)

Venkata Kamalakar Mutta

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

U. Prendergast

Dublin City University

C. Kubel

Karlsruher Institut für Technologie (KIT)

Karlsruhe Nano Micro Facility

T. Lemma

Dublin City University

J. F. Dayen

Université de Strasbourg

T. E. Keyes

Dublin City University

B. Doudin

Université de Strasbourg

M. Ruben

Université de Strasbourg

Karlsruher Institut für Technologie (KIT)

S. J. van der Molen

Universiteit Leiden

Beilstein Journal of Nanotechnology

2190-4286 (ISSN)

Vol. 5 1 1664-1674






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