14764
Annealing above 200 degrees C for 60 min resulted in complete transformation from Cu NWs into Cu oxide nanotubes .
 Chemical: Cu; Chemical: Cu oxide
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: Cu; Chemical: Cu oxide