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Controlled Synthesis of Saponin-Capped Silver Nanotriangles and Their Optical Properties

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Abstract

Here, in this report, saponin-capped triangular silver nanocrystals have been synthesized in aqueous system by using only Trigonella foenum-graecum seed extract as a reducing agent. X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and atomic force microscope (AFM) have been used for the study of their morphological and structural characterization, which indicate that the synthesized nanoparticles are crystalline in nature with triangular morphology having the edge length of the triangle as 80 nm approximately. UV/Vis study of the nanoparticle solution shows three absorption peaks at wavelength of 360 nm, 432 nm, and 702 nm, and these are respectively related to the transverse and longitudinal oscillations of electron, which remain almost in the same position for more than 6 months, indicating the formation of silver nanocrystals with a higher stability. Further, Fourier transform infrared spectroscopy (FTIR) spectra clearly indicate the capping of nanoparticles by saponin, one of the components of Trigonella foenum-graecum extract.

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Acknowledgments

The authors are thankful to SAIF NEHU, Shillong, and SAIF, IITM, India, for providing the TEM and FTIR analyses respectively, and to Krishna Deb, Department of Physics, NIT Agartala, for providing XRD data.

Funding

The authors are grateful to the SERB-DST, Govt. of India for providing the financial grant (Project File Number: EMR/2016/005538, Dated: 15-Jun-2017) for this work and to FIST-DST Program Govt. of India (Ref. No. SR/FST/PSI-191/2014, Dated 21.11.2014) for the financial grant to the Department.

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  1. Nanophysics and Nanotechnology Research lab, Department of Physics, Tripura University, Agartala, Tripura, 799022, India

    Babli Debnath & Ratan Das

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Debnath, B., Das, R. Controlled Synthesis of Saponin-Capped Silver Nanotriangles and Their Optical Properties. Plasmonics 14, 1365–1375 (2019). https://doi.org/10.1007/s11468-019-00923-y

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