Find these papers, some info can be drawn from these.

http://www.ncbi.nlm.nih.gov/pubmed/25622685

http://link.springer.com/article/10.1007%2Fs11051-014-2327-0#page-1

http://connection.ebscohost.com/c/articles/94942244/biosynthesis-flat-silver-nanoflowers-from-flos-magnoliae-officinalis-extract-simulation-solution

http://n03.iphy.ac.cn/Article/2009%20Advanced%20Material,%2021%EF%BC%8C1-5.pdf

Thanks for the suggested papers.

You can see my paper: Synthesis of Tetrapod ZnO by Direct Oxidation of Zinc metal at elevated temperature.

Thank you very much.