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In this work, the gold nanostars (AuNS) were highly efficient in synthesis through the seed-mediate method using the surfactant cetyltrimethylammonium bromide (CTAB) and the reductant ascorbic acid. Significantly, the length of branches on the AuNS was controlled by governing the reaction composition. The effects of AgNO3 volume and CTAB concentration on the formation of AuNS were systematically investigated for clarifying their role in the growth of gold nanocrystal; thereby controlling the shape, number, and length of branches on the star-like nanoparticles. The UV-Vis analysis and scanning electron microscopic images exhibited that the AuNS were formed with the prepared condition with AgNO3 0.05 mM, 0,10 M CTAB; and the desired lengths of branches on AuNS were successfully adjusted. The physical chemistry properties of formed AuNS were further characterized through Ultraviolet-visible spectroscopy (UV-Vis), transmission electron microscopy (TEM), Energy dispersive spectroscopy (EDS), and zeta potential (ZP), X-Ray diffraction, and selected area electron diffraction (SAED). The UV-Vis results show the surface plasmon resonance (SPR) peaks around the wavelength of 700-750 nm, indicating the formation of AuNS. The TEM and SEM images further clarify the prediction of the formation of AuNS with long and shaped branches. DLS results were performed that the synthesized AuNSs have an average size of 13 nm. In addition, the XRD, EDS, and zeta potential also provide a more understanding insight into the formation mechanism of AuNSs. The yield of the synthesized process of AuNS was significantly improved to 96,82 %, based on ICP-MS methods. This nanomaterial is feasible for many application fields, including biosensors, catalysts, and drug delivery.

Author's Affiliation
  • Anh Thu Nguyen

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  • Viet Ha Thi Le

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  • Sy Van Vu

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  • Bich Thao Thi Nguyen

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  • Khuong Vo Quoc

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  • Anh Thi Ngoc Quang

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Article Details

Issue: Vol 6 No 3 (2022): Vol 6, Issue 3: Under publishing
Page No.: In press
Published: Aug 29, 2022
Section: Original Research

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Copyright: The Authors. This is an open access article distributed under the terms of the Creative Commons Attribution License CC-BY 4.0., which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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 How to Cite
Nguyen, A. T., Le, V. H., Vu, S., Nguyen, B. T., Vo Quoc, K., & Quang, A. (2022). Studying the appropriate reaction conditions for the high yield controlled synthesis of gold nanostars by the seed-mediated method. VNUHCM Journal of Natural Sciences, 6(3), In press.

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