7423
Its SERS performance was evaluated by mapping ( 10 x 10 ) mu m ( 2 ) areas and resulted in average enhancement factors that span from 2 . 3 x 10 ( 3 ) to 1 . 2 x 10 ( 5 ) with a maximum enhancement factor of 2 . 5 x 10 ( 5 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None