9617
Quantitatively , the fluorescence intensity of PEI - capped Ag nanoclusters exhibits a linear fashion over the pH range of 5 . 02 - 7 . 96 and increases by around 10 - fold approximately with greater fluorescence at higher pH values .
 Chemical: PEI; 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: PEI; Chemical: Ag