Silver nanoparticles (NPAg) using padina australis seaweed

¹ Department of Chemistry Education Study Program, Faculty Of Teacher Training and Education, Maritim Raja Ali Haji University 29215 Riau Islands, Indonesia
² Department of Chemistry, Faculty of Engineering and Maritime Technology, Raja Ali Haji Maritime University, Senggarang, Tanjungpinang 29100, Indonesia

^* Corresponding author: nancywillian@umrah.ac.id

Abstract

The synthesis of silver nanoparticles (NPAg) using Padina australis seaweed as a bioreductor and AgNO₃ as a precursor through the green synthesis method was successfully achieved. This environmentally friendly approach utilized various concentrations of the seaweed extract and silver nitrate precursor, resulting in the formation of silver nanoparticles at each concentration variation. The stability of these nanoparticles was confirmed by the observable changes in solution color, maximum wavelength, absorbance, and peak length shift. The process exhibited consistent results, with minimal wavelength variation occurring within 1 to 6 hours, particularly at a concentration ratio of 3 mM and 5:10 mL extract to precursor. These findings demonstrate the potential of Padina australis seaweed in the sustainable production of silver nanoparticles, offering a green alternative for nanoparticle synthesis.