17700
We have developed a facile and straightforward approach for continuous fabrication of neat , morphology - defined , graphene - based hollow fibers ( HFs ) via a coaxial two - capillary spinning strategy .
 Chemical: graphene
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: graphene