Page 21 - Bullion World Volume 3 Issue 2 February 2023

Bullion World | Volume 3 | Issue 2 | February 2023

The optical properties of silver Silver nanotringle can easily tune for flexible and stretchable
nanoparticles can be tuned by the band gap in the range of applications. Silver nanowires
varying particle shapes and sizes. 1.2–2.8 eV by controlling the edge provide high transparency with
Silver nanocubes have been used length of nanotringles during the low haze since their aspect ratio
in numerous applications, such synthesis process. It is a promising is higher as possible. Forming a
as plasmonic sensing, surface- candidate for the light-harvesting good percolation threshold within
enhanced Raman scattering application with a wavelength in the the dispersed AgNWs network
(SERS), metamaterials, catalysis, visible and near-infrared range. is necessary to achieve good
and bio-nanotechnology. The electrode conductivity. As a result,
sharp corners and edges of the Silver nanowires have piqued silver nanowires are an excellent
silver nanocubes give additional the interest of researchers due alternative to indium tin oxide (ITO)
plasmonic modes at different to their unique morphology for a transparent conductor. Indium
resonance wavelengths in the among the various shapes of is a rare metal, and the price of ITO
spectrum. Silver nanoflowers silver nanomaterials. Generally, is rising dramatically due to its high
are used for the preparation of nanowires have a diameter of demand for transparent electronics
highly conductive ink due to their <100 nm and a length >10 um and scarcity.
hierarchically-structured petals (aspect ratio > 100, it is nothing
that can actively coalesce at a but the ratio of length and There are various methods for
low curing temperature which diameter of nanowire). Silver synthesizing silver nanomaterials.
constructs the percolation pathway. nanowires have a good balance Among all the techniques, a
Due to its excellent coalescence between their stability and cost. polyol method is one of the best
property of nanoflowers, it provides They also show good mechanical for synthesizing monometallic
higher conductivity with a lower strength and high thermal as and bimetallic nanoparticles,
concentration of conductive filler. well as electrical conductivity nanorods, nanowires, nanoparticles
and nanosheets. Synthesis of
AgNWs happens prominent by
this method. The polyol method
can produce nanomaterials on a
large scale and typically has the
advantage of its inherent reducing
ability to prevent the oxidation
of nanomaterial while storage
since the formed nanomaterials
remain in the solvent. In polyol-
assisted synthesis, ethylene glycol
is used as the solvent as well as
a reducing agent at the higher
reaction temperature. Ethylene
glycol convert into acetaldehyde at
a higher temperature (>120 °C) to
reduce the metal precursor to form
a metal atom. The method looks
simple, however needs critical
controls and engineering that must
ensure uniform size nuclei as well
as unidirectional growth. These
wires find applications in making
conducting inks, smart textiles,
touch screen, flexible electronics,
coatings for EMI shielding, etc.,
demand for all of which are
exponentially increasing.

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