Abstract
We present a very simple and effective way for the synthesis of tunable coloured silver sols having different morphologies. The procedure is based on the seed-mediated growth approach where methyl cellulose (MC) has been used as soft-template in the growth solution. Nanostructures of varying morphologies as well as colour of the silver sols are controlled by altering the concentration of citrate in the growth solution. Similar to the polymers in the solution, citrate ions also dynamically adsorbed on the growing silver nanoparticles and promote one (1-D) and two-dimensional (2-D) growth of nanoparticles. Silver nanostructures are characterized using UV–vis and HR-TEM spectroscopic study. Simulation of the UV–vis extinction spectra of our synthesized silver nanostructures has been carried out using discrete dipole approximation (DDA) method.
Highlights
Nanoparticles have attracted considerable interest because of their unique optical, electromagnetic, and catalytic properties that differ from bulk ones
We present a very simple and effective way for the synthesis of tunable coloured silver sols having different morphologies
We present a simple seeding growth approach to synthesize silver nanostructure of different morphologies e.g. circular disc and rod-shaped particles
Summary
Nanoparticles have attracted considerable interest because of their unique optical, electromagnetic, and catalytic properties that differ from bulk ones. Morphology, and surface charge modification play a vital role in determining the optical properties of nanoparticle and there is a growing interest in the controlled synthesis of silver nanoparticles among the all noble metals. A number of theoretical approaches have been developed, based on more advanced scattering theories for anisotropic metal nanoparticles. These include the generalized multipole technique (GMT) [31], the T-matrix method [32], the discrete dipole approximation (DDA) [33], and the finite different time domain (FDTD) method [34]. All solutions were prepared in triple distilled de-ionized water
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