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Issue 31, 2014
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Tilt boundary induced heteroepitaxy in chemically grown dendritic silver nanostructures on germanium and their optical properties

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Abstract

Dendritic silver nanostructures were prepared by a simple dip-and-rinse galvanic displacement reaction directly on germanium surfaces. The formation and evolution of these dendrites were investigated using scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM) and energy-dispersive X-ray spectroscopy (EDX). The present results clearly show a new type of heteroepitaxy, where the large lattice mismatch between silver and germanium is accommodated at the interface by the formation of low-energy asymmetric tilt boundaries. The overgrown samples reduce the strain by introducing crystal defects. Additionally, by employing cathodoluminescence (CL) spectroscopy and imaging with a field emission gun scanning electron microscope (FEG-SEM), we provide information on the surface plasmon assisted photon emission of a stack of Ag hexagonal nanostructures. Surface enhanced Raman scattering (SERS) studies show the suitability of such Ag nanodendritic structures as SERS active substrates.

Graphical abstract: Tilt boundary induced heteroepitaxy in chemically grown dendritic silver nanostructures on germanium and their optical properties

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Publication details

The article was received on 20 Apr 2014, accepted on 30 May 2014 and first published on 02 Jun 2014


Article type: Paper
DOI: 10.1039/C4CP01711K
Citation: Phys. Chem. Chem. Phys., 2014,16, 16730-16739
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    Tilt boundary induced heteroepitaxy in chemically grown dendritic silver nanostructures on germanium and their optical properties

    T. Ghosh, P. Das, T. K. Chini, T. Ghosh and B. Satpati, Phys. Chem. Chem. Phys., 2014, 16, 16730
    DOI: 10.1039/C4CP01711K

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