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The illustration is of the catalytic activity of the reported oxygen - functionalized few - layer graphenes , whereas the micrograph background image is of the same graphenes recorded by the authors using a new helium - ion microscope at the CNMS .
 Chemical: oxygen; Chemical: graphenes; Chemical: graphenes; Chemical: helium
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: oxygen; Chemical: graphenes; Chemical: graphenes; Chemical: helium