The Role of pH in Controlling Size and Distribution of Silver Nanoparticles using Biosynthesis from Diospyros discolor Willd. (Ebenaceae)

5th International Conference on Advanced Materials Sciences and Technology

Nurfadhilah, M.^1 ; Nolia, I.^1 ; Handayani, W.^1 ; Imawan, C.^2

Department of Biology, FMIPA Universitas Indonesia, Kampus UI, Depok

16424, Indonesia^1

Department of Physics, FMIPA Universitas Indonesia, Kampus UI, Depok

16424, Indonesia^2

关键词: Absorbance peak;    Aqueous extracts;    diospyros discolor;    Size and shape;    Size distribution pattern;    Synthesis parameters;    TEM characterization;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/367/1/012033/pdf
DOI  :  10.1088/1757-899X/367/1/012033

来源: IOP

【 摘 要 】

The silver nanoparticles generated by biosynthesis have a quite diverse result, both in size and shape. Structures of silver nanoparticles can be controlled by modifying the parameters of the biosynthesis such as the ratio between the precursors and reducing agents, as well as pH of the solution. In this study, the pH of Diospyros discolor (Bisbul) leaves aqueous extract was varied to 4, 7, 9, and 11. The extract then was added to 1 mM AgNO3precursor (1:2; v/v ratio). The result of the silver nanoparticles characterized using spectrophotometer UV-Vis to find if there was any absorbance peak formed between 400 nm to 500 nm. TEM characterization was used to determine the size and shape of silver nanoparticles, and PSA was used to see their size distribution and stability. The higher pH tends to produce smaller silver nanoparticles rapidly. The synthesis parameters that were varied in this research have affected the size, size distribution patterns, and stability of silver nanoparticles.