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. 2015 May 14;5:10311. doi: 10.1038/srep10311

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(A) Schematic representation of chitosan protected gold nanoraspberry and chemical structure of chitosan. (B) HRTEM image of GRBs (C1–C5) TEM images of GRBs synthesized with different concentration of chitosan (scale bars represent 50 nm). (D) Vis-NIR extinction spectra of GRBs synthesized with different concentrations of chitosan (E) Thermogravimetric analysis of GRBs to show percentage weight of chitosan and its transition temperature between 400 and 800 ºC. (Inset) TEM analysis with negative staining reveals 20–30 nm of polymer layer, which confirms the presence of chitosan on GRBs.