28875
We have demonstrated that thin films of hierarchical NiO microflakes assembled from nanoleaves can be grown directly on FTO - coated glass substrates using a facile and template - free hydrothermal technique .
 Chemical: NiO; Chemical: FTO
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: NiO, FTO 
Answer:
 Chemical: NiO; Chemical: FTO