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A variety of inorganic nanoparticles can be grown on the surface of nano - graphene , obtaining functional graphene - based nanocomposites with interesting optical and magnetic properties useful for multi - modal imaging and imaging - guided cancer therapy .
 Chemical: graphene; Chemical: graphene
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: graphene; Chemical: graphene