19091
Density functional theory ( DFT ) calculations suggested a charge transfer ( CT ) transition process between the molecules and the Cu2O nanospheres .
 Chemical: Cu2O
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: Cu2O 
Answer:
 Chemical: Cu2O