10648
The PFS / PEI multilayers are effective for the electrochemical sensing of ascorbic acid and hydrogen peroxide and show improved sensing performance at higher bilayer numbers .
 Chemical: PFS; Chemical: PEI; Chemical: ascorbic acid; Chemical: hydrogen peroxide
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: PFS; Chemical: PEI; Chemical: ascorbic acid; Chemical: hydrogen peroxide