18022
The optical extinction response of individual Au - Ag @ SiO2 heterodimers whose individual morphologies are determined by transmission electron microscopy ( TEM ) is investigated using spatial modulation spectroscopy .
 Chemical: Au - 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 - Ag; Chemical: SiO2