The synthesis of alginate-capped silver nanoparticles under microwave irradiation

Foliatini, Yoki Yulizar, Mas Ayu Elita Hafizah

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14 Citations (Scopus)


Synthesis of silver nanoparticles (Ag-NP) was successfully performed within a few minutes by microwave irradiation of the precursor salt (AgNO3) and alginate mixed solution in one pot. Herein, alginate molecules acted as both a reducing and stabilizing agent for the preparation of the silver nanoparticles. The obtained nanoparticles were characterized by ultraviolet-visible (UV-Vis) spectroscopy, particle size analysis (PSA), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). The pH and concentration ratio of the alginate/metal precursor salt greatly influenced the particle size and its distribution of Ag-NP. The higher the pH the higher the nucleation rate and the larger the electrostatic stabilization, while both of them were responsible for producing a smaller particle size and a narrower size distribution. A higher concentration ratio also yielded a smaller particle size and a narrower size distribution, but above the optimum ratio, the trend was conversely changed due to the reducing capability of the alginate, which was dominant above the optimum ratio, thus creating a high density of nuclei, allowing aggregation to occur. A lower ratio not only led to a higher tendency to produce larger particles, but also a higher probability of anisotropic particle shape formation due to the lack of reducing capability of the alginates.

Original languageEnglish
Pages (from-to)31-50
Number of pages20
JournalJournal of Mathematical and Fundamental Sciences
Issue number1
Publication statusPublished - 2015


  • Alginate
  • Microwave irradiation
  • Particle size
  • Reducing and stabilizing agent
  • Silver nanoparticles (Ag-NPs)


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