Controlled reshaping and plasmon tuning mechanism of gold nanostars
作者： Abhitosh Kedia , Pandian Senthil Kumar
DOI: 10.1039/C3TC30574K
关键词:
摘要: Anisotropic multi-branched gold nanoparticles exhibit intense localized electromagnetic fields at their tips/edges and hence have attracted significant attention in surface enhanced Raman scattering (SERS), as well bio-sensing applications. Our quest for such complex hyper-branching nanostructures has revealed that even the addition of a simple base (like NaOH) to precursor reaction mixture enhances fine tuning/reshaping 3D star/flower-like nanostars with controlled precision right from nucleation stage. With increasing basicity mixture, two strongly plasmon resonance (LSPR) peaks essentially merge into broad singular peak, effectively indicating steady transition (non)planar structures conventional spheroidal nanostructures, confirmed by transmission electron microscopy (TEM) measurements. Such pH induced size/shape transitions were monitored kinetically detail through correlated molecular spectroscopic measurements nuclear magnetic resonance, fourier transformation infrared spectroscopy X-ray photoelectron (NMR, FTIR XPS), first time best our knowledge, which ascertains rational paradigm better understanding polyvinylpyrrolidone (PVP) functionality its simultaneous reducing, stabilizing action, precisely controlling anisotropic nanostructure growth mechanism further exploiting this utilizing these as-formed extremely stable colloidal dispersions various specific plasmonic
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