8397
When combined with the shift of the Fermi level from the Dirac point , we are able to ascertain the position of the Dirac point at 3 . 6 eV +/- 0 . 05 eV with respect to the bottom of the SiO ( 2 ) conduction band edge , yielding a work function of 4 . 5 eV +/- 0 . 05 eV which is in an excellent agreement with theory .
 Chemical: SiO ( 2 )
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: SiO ( 2 )