18023
The extinction spectra show two resonances spectrally close to the surface plasmon resonances of the constituting Au and Ag @ SiO2 core - shell particles .
 Chemical: Au; Chemical: Ag; Chemical: SiO2
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: Au; Chemical: Ag; Chemical: SiO2