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UV - vis absorbance spectroscopy and TEM results indicated that both size and optical properties of the Ag nanoparticles in the PEM can be controlled by manipulating ion content in the PEM and the number of the ion - exchange / reduction cycle , whereas that of Ag - Au bimetallic nanoparticles were dependent on size of the Ag templates and the replacement reaction kinetics .
 Chemical: Ag; Chemical: Ag - Au; 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; Chemical: Ag - Au; Chemical: Ag