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Significantly , we found that the carbon could be removed or replaced from the surface of Ag nanoparticles through chemical or physical means , rendering the nanoparticles the capability for correlated SEM / SERS studies .
 Chemical: carbon; Chemical: Ag
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: carbon; Chemical: Ag