1906
The chemical functionalization leads to an increase in HOMO / LUMO energy gap of CNT by about 0 . 32 to 0 . 35 eV ( except for - H ) .
 Chemical: H
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: H