16195
Assemblies of 3 . 5 nm PbS nanoparticles ( NPs ) nucleate in three dominant superlattice polymorphs : amorphous , body - centered - cubic ( bcc ) and face - centered - cubic ( fcc ) phase .
 Chemical: PbS
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: PbS