Au nanoparticles coated with chitosan

Akitoshi Tokumasu, Tomoya Inose, Noriko Yamauchi, Kouichi Nakashima, Masayuki Tokunaga, Chihiro Kato, Keiichiro Hatoyama, Takashi Kamei, Kohsuke Gonda, Yoshio Kobayashi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper describes a method of coating metallic gold (Au) nanoparticles with chitosan (CS) shells in an aqueous solution. A colloidal solution of Au nanoparticles with a particle size of 16.5 ± 1.7 nm was prepared by reducing the Au ions (III) with sodium citrate in water at 80 °C. CS coating was achieved in an aqueous solution containing the Au nanoparticles by using CS as a shell source and sodium hydroxide as a pH adjuster at 25 °C. Ultraviolet-visible extinction spectroscopy and transmittance electron microscopy observation revealed that the Au nanoparticles were coated with CS shells. Additionally, the CS shell thickness could be varied in a range up to 2.2 nm by changing the CS concentration during the CS-coating process. [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)1143-1148
Number of pages6
JournalColloid and Polymer Science
Issue number7-8
Publication statusPublished - 2019 Aug 1


  • Au
  • Chitosan
  • Core-shell
  • Nanoparticle


Dive into the research topics of 'Au nanoparticles coated with chitosan'. Together they form a unique fingerprint.

Cite this