Thermally Activated Sliding of C60 on Gold
Matteo Pierno, Lorenzo Bruschi, Guido Paolicelli, Alessandro di Bona, Stefania Benedetti, Nicola Manini, Andrea Vanossi, Giampaolo Mistura
TL;DR
This study shows that C60 molecules can slide on gold surfaces when heated, revealing insights into the slipperiness of gold-carbon interfaces.
Contribution
The paper demonstrates thermally activated sliding of C60 on gold electrodes using a quartz crystal microbalance.
Findings
C60 molecules are pinned on gold at room temperature.
Sliding of C60 molecules on gold begins above 320 K.
The sliding behavior is explained by a diffusive model.
Abstract
Gold nanoclusters are known to slide easily on a graphite surface. In this study, we confirm the slipperiness of the gold–carbon interface by studying the sliding behavior of fullerene adsorbates on gold by using a quartz crystal microbalance (QCM). More precisely, we transfer high-quality gold electrodes deposited on an atomically flat mica substrate to the QCM. By means of an effusion cell, we deposit C60 molecules on the QCM gold electrode kept in ultrahigh vacuum. We observe the pinning of the fullerene adsorbates at room temperature. As the temperature increases above 320 K, the fullerene adsorbates begin to slide. This thermally activated sliding is explained in terms of a simple diffusive model.
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Taxonomy
TopicsForce Microscopy Techniques and Applications · Diamond and Carbon-based Materials Research · Molecular Junctions and Nanostructures