Preparation of Colloidal Ag Nanoparticles Using the Biologically Compatible Polymers and Reducing Agents

  • Roto Department of Chemistry, Universitas Gadjah Mada, Yogyakarta, Indonesia
  • Dita Floresyona Department of Chemistry, Universitas Gadjah Mada, Yogyakarta, Indonesia
Keywords: Ag nanoparticle, TEM, fcc, unit cell, piper betel, biocompatible


Silver (Ag) nanoparticles have been studied extensively due to its possible applications such as catalysts, electronic devices, anti-bacterial, medical applications and sanitation. For medical applications and sanitations, the colloidal Ag nanoparticles must be stable for a long period and biocompatible. In this contribution, we report on the preparation of silver nano-colloids in the biologically compatible polymers of chitosan, as opposed to synthetic polymers, and biocompatible reducing agents. The Ag colloids with nanometer size of 20-80 nm in diameter are prepared by reducing silver ions in the concentration range of 100-300 mg/L in the 1% chitosan solution at 95 oC.  The piper beetle leaves extract was added as a biocompatible reducing agent. The silver nano colloid is stable for up to 6 weeks. The colloidal Ag nanoparticle has a UV-Vis absorption spectra with wavelength maxima at around 420-450 nm. The silver nanoparticle has an fcc crystal system with a unit cell of 4.07 angstrom. The results were comparable to the previous findings obtained in the polyvinyl alcohol and the addition of ascorbic acid as a reducing agent.


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