24450
It is shown that the band gap of graphdiyne increases from 0 . 47 eV to 1 . 39 eV with increasing the biaxial tensile strain , while the band gap decreases from 0 . 47 eV to nearly zero with increasing the uniaxial tensile strain , and Dirac cone - like electronic structures are observed .
 Chemical: graphdiyne
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: graphdiyne