Formation of AuNPs was confirmed by UV-vis spectroscopic analysis. 
UV-vis spectroscopic analysis
The AuNPs were characterized using transmission electron microscopy, X-ray diffraction and dynamic light scattering.  Transmission electron microscopy revealed that the AuNPs were mostly nanometer-sized spherical particles. 
Transmission electron microscopy
Powder X-ray diffraction analysis proved the formation of face-centered cubic structure of Au. 
Powder X-ray diffraction
The AuNPs were characterized using transmission electron microscopy, X-ray diffraction and dynamic light scattering. 
Dynamic light scattering