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Abstract
Single crystalline indium nanowires were prepared on Zn substrate which had been treated in concentrated sulphuric acid by galvanic displacement in the 0.002 mol L−1In2(SO4)3-0.002 mol L−1SeO2-0.02 mol L−1SDS-0.01 mol L−1citric acid aqueous solution. The typical diameter of indium nanowires is 30 nm and most of the nanowires are over 30 μm in length. XRD, HRTEM, SAED and structural simulation clearly demonstrate that indium nanowires are single-crystalline with the tetragonal structure, the growth direction of the nanowires is along [100] facet. The UV-Vis absorption spectra showed that indium nanowires display typical transverse resonance of SPR properties. The surfactant (SDS) and the pretreatment of Zn substrate play an important role in the growth process. The mechanism of indium nanowires growth is the synergic effect of treated Zn substrate (hard template) and SDS (soft template).
Highlights
The interaction of light with metal nanoparticles and nanowires as opposed to their bulk counterparts are subject to intense research for their application in plasmonics including chemical sensors and optical filters [1]
We report the synthesis of indium nanowires by galvanic displacement on a zinc sheet after being treated in concentrated sulphuric acid
The high resolution-transmission electron microscope (HRTEM) images and simulation results reveal that the dark contrast areas correspond to atomic columns and the In nanowire consisted of the stacking of (100) planes
Summary
The interaction of light with metal nanoparticles and nanowires as opposed to their bulk counterparts are subject to intense research for their application in plasmonics including chemical sensors and optical filters [1]. Keywords Indium Á Nanowire Á Galvanic displacement Á Surface plasmon resonance Á Soft template Some metal nanoparticles, such as gold and silver, have exhibited a strong absorption peak in the visible range of the spectrum, due to the excitation of a collective oscillation of electrons which is described as the surface plasmon resonance (SPR) [2,3,4,5,6].
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