10759
As a result , we demonstrate that the controlled generation of oxygen vacancies can activate the photoactivity of pure hematite remarkably and further enhance the Sn doping effects synergistically .
 Chemical: oxygen; Chemical: hematite; Chemical: Sn
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: oxygen, hematite, Sn 
Answer:
 Chemical: oxygen; Chemical: hematite; Chemical: Sn