8436
The scattering properties of these nanoparticles are shown using surface enhanced Raman scattering ( SERS ) at 1064 nm excitation wavelength and are compared to citrate reduced gold and silver nanoparticles of similar physical sizes and surface properties .
 citrate, silver
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 citrate, silver