25711
We investigated CO adsorption on the pristine , Stone - Wales ( SW ) defected , Al - and Si - doped graphenes by using density functional calculations in terms of geometric , energetic and electronic properties .
 Chemical: CO; Chemical: Al; Chemical: Si; Chemical: graphenes
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: CO, Al, Si, graphenes 
Answer:
 Chemical: CO; Chemical: Al; Chemical: Si; Chemical: graphenes