9454
Therefore , high - performance solution - processed nanotube transistors with a 15 nm channel length were obtained by combining a top - gate structure and gate insulators made of a high - dielectric - constant ZrO ( 2 ) film .
 ZrO ( 2 )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ZrO ( 2 )