Abstract
Silver nanoparticle (AgNP) has wide-spread applications in photovoltaic cell, biological sensors, biomedical devices, surface enhanced Raman scattering (SERS) etc. which are intricately dependent on AgNP shape, size, concentration and aggregation states. Here, the particle size, shape and aggregation dependent dipole and quadrupole surface plasmon resonances are spectroscopically investigated by preparing AgNPs (diameter 10–110nm) using silver nitrate (AgNO3) and sodium borohydride (NaBH4 as reducing agent) in aqueous environment at 0 ∘C. The AgNP UV-Visible spectra showing plasmon-induced dipole and quadrupole modes are corroborated by the theoretical framework of Mie-Gans model and discrete dipole scattering model DDSCAT and different particle sizes, shapes and possible aggregation or clusterization are predicted. All the samples show presence of spherical and nonspherical distribution of AgNP. However, the concentration of nonspherical particle is more for higher concentration of reducing agent as is evidenced by the appearance of quadrapole absorption maxima. The minimum particle size is found at a particular ratio of concentration of AgNO3 and NaBH4. The day variation of AgNP kinetics also signalled the onset of quadrupole deformation of clusters.
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The authors gracefully acknowledge the financial support from Department of Science and Technology (India) to procure the UV-Visible spectrophotometer under the FIST scheme at the Dept. of Physics, Barasat Government College.
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Islam, M.M., Mandal, S. & Bhattacharya, S. Investigation of the Growth Kinetics and Multipolar Plasmonic Properties of Silver Nanoparticle Cluster by Experiment and Numerical Simulations. Plasmonics 13, 1803–1810 (2018). https://doi.org/10.1007/s11468-018-0694-6
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DOI: https://doi.org/10.1007/s11468-018-0694-6