14676
For core / shell nanoheterostructures a selective doping of either the shell or predominantly of the core with Co ( 2 + ) is demonstrated .
 Chemical: Co ( 2 + )
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: Co ( 2 + )