Abstract
Platinum coated by silver nanoparticles was synthesized, which displays a unique structure where polycrystalline platinum particles are completely encapsulated in continuous monocrystalline silver shells. These particles display accentuated electronic properties, where the silver shells gain electron density from the platinum cores, imparting enhanced properties such as oxidation resistance. This electron transfer phenomenon is highly interfacial in nature, and the degree of electron transfer decreases as the thickness of silver shell increases. The nanoparticle structure and electronic properties are studied and the implication to creating sensing probes with enhanced robustness, sensitivity and controllable plasmonic properties is discussed.
Highlights
Plasmonic-based sensing probes consisting of nanoparticles (NP)s have become highly desirable because of their enhanced sensitivity, low cost, and easy to use nature [1,2]
The results demonstrate that the electronic transfer phenomenon can be extended to a wide range of heterostructure systems, and provides insight into how to exploit electronic transfer to create silver based sensing probes with enhanced robustness, high optical/plasmonic activity and plasmonic characteristics that can be tuned for a desired application
transmission electron microscopy (TEM) (HRTEM), scanning TEM equipped with a high angle annular dark-field detector (STEM-HAADF), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and ultraviolet-visible spectroscopy (UV-Vis)
Summary
Plasmonic-based sensing probes consisting of nanoparticles (NP)s have become highly desirable because of their enhanced sensitivity, low cost, and easy to use nature [1,2]. It was shown that Au@Ag NPs display a unique electron transfer phenomenon that results in the silver shell becoming oxidation resistant while retaining its strong plasmonic properties [9,11] By extending this phenomenon to other silver based NP systems, insight can be gained into how to manipulate the particle structure and composition towards the desired characteristics. The results demonstrate that the electronic transfer phenomenon can be extended to a wide range of heterostructure systems, and provides insight into how to exploit electronic transfer to create silver based sensing probes with enhanced robustness, high optical/plasmonic activity and plasmonic characteristics that can be tuned for a desired application
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