5960
Nanoporous silicon ( Si ) networks with controllable porosity and thickness are fabricated by a simple and scalable electrochemical process , and then released from Si wafers and transferred to flexible and conductive substrates .
 Chemical: silicon; Chemical: Si; Chemical: Si
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: silicon; Chemical: Si; Chemical: Si