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The exposed conductive channel by gas dielectric is responsible for the high sensitivity to SO2 and the adsorption of the SO2 molecules dramatically enhances the field - effect mobility .
 Chemical: SO2; Chemical: SO2
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: SO2; Chemical: SO2