7236
Multifunctional Fe3O4 @ Ag / SiO2 / Au core - shell microspheres as a novel SERS - activity label via long - range plasmon coupling .
 Chemical: Fe3O4; Chemical: Ag; Chemical: SiO2; Chemical: Au
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: Fe3O4; Chemical: Ag; Chemical: SiO2; Chemical: Au