17155
Highly ordered ultra - long oxide nanotubes are fabricated by a simple two - step strategy involving the growth of copper nanowires on nanopatterned template substrates by magnetron sputtering , followed by thermal annealing in air .
 Chemical: oxide; Chemical: copper
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: oxide; Chemical: copper