Abstract
Non-isolated nanoparticles show a plasmonic response that is governed by the localized surface plasmon resonance (LSPR) collective modes created by the nanoparticle aggregates. The individual and collective LSPR modes of silver nanoparticle aggregated by covalent binding by means of bifunctional molecular linkers are described in this study. Individual contributions to the collective modes are investigated at nanometer scale by means of energy-filtering transmission electron microscopy and compared to ultraviolet–visible spectroscopy. It is found that the aspect ratio and the shape of the clusters are the two main contributors to the low-energy collective modes.
Highlights
The optical properties of the noble metal nanoparticles (NPs) are dominated by localized surface plasmon resonances (LSPR) [1]
Silver NP aggregates have been created. They were analyzed at a large scale by UV–vis spectroscopy (UV–vis) and at nanometer scale by energyfiltering transmission electron microscopy (EFTEM)
That allowed the identification of the plasmonic modes that contribute to the global optical behavior of the system
Summary
The optical properties of the noble metal nanoparticles (NPs) are dominated by localized surface plasmon resonances (LSPR) [1]. If the NPs are close to each other, even creating clusters, the LSPR is controlled by the distance between NPs and the aspect ratio and shape of the NPs clusters [3, 4]. They were analyzed at a large scale by UV–vis spectroscopy (UV–vis) and at nanometer scale by energyfiltering transmission electron microscopy (EFTEM). The analysis of clusters with increasing number of NPs showed that the aspect ratio of the clusters determines the collective mode. The importance of the shape of the cluster was studied and discussed
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