23577
Scanning electron microscopy and transmission electron microscopy confirmed the synthesized PS / Fe2O3 particles to be comprised of a PS surface coated with Fe2O3 nanoparticles .
 Chemical: Fe2O3; Chemical: Fe2O3
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: Fe2O3; Chemical: Fe2O3