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As a result , Fe ( 3 ) O ( 4 ) @ Ag / SiO ( 2 ) / Au microspheres have the best enhancement effect in the Raman active research by using Rhodamine - b ( RdB ) as a probe molecule .
 Chemical: Fe ( 3 ) O ( 4 ); Chemical: Ag; Chemical: SiO ( 2 ); Chemical: Au; Chemical: Rhodamine - b; Chemical: RdB
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: Fe ( 3 ) O ( 4 ); Chemical: Ag; Chemical: SiO ( 2 ); Chemical: Au; Chemical: Rhodamine - b; Chemical: RdB