Nanodendrites of silver were synthesized by electrodeposition using
AgNO3
as the source in ammoniacal solution. The method was remarkably fast, simple and scalable.
X-ray diffraction (XRD) studies confirmed the formation of a cubic phase of silver. Scanning
electron microscopy (SEM) revealed the formation of well-shaped dendrites. The nanodendrites
were hyperbranched with lengths of the order of a few micrometres. The concentration of
NH3 in
the electrolyte solution was found to have remarkable influence on the morphology, crystallite size
and formation of branched nanodendrites. The branchings were found to occur at regular intervals
of ∼50 nm along the main stem. Transmission electron microscopy (TEM) studies confirmed the
SEM observation and revealed the 2D nature of the dendrites. Selected area electron
diffraction (SAED) revealed that the dendrites were single crystalline in nature and the
branching could have a crystalline origin. The direction of growth as inferred from SAED
was . UV–vis spectra showed a single broad band centred on
∼380 nm indicating the spherical shape of the individual crystallites. The intrinsic size effect of the
metal surface plasmon was used to explain the increase in the broadening on addition of
NH3. The asymmetry of the band was explained on the basis of agglomeration of crystallites.
The nanodendrites prepared by this method showed extension of the plasmon band
through the entire visible region, indicating potential use in detection of single molecules
based on enhanced Raman scattering. The deposition mechanism is described using the
diffusion-limited aggregation model.
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