18339
The components of the microparticle carry multiple functionalities : ( i ) an easy identification by Raman imaging ( photostable astralen ) and ( ii ) SERS due to a rough surface of Ag nanoparticles .
 Chemical: Ag
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Ag