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We utilized this process to prepare conformal iron oxide thin films on a porous framework , for which alpha - Fe2O3 is active for photocatalytic water splitting .
 Chemical: iron oxide; Chemical: alpha - 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: iron oxide; Chemical: alpha - Fe2O3