15218
Surface modifications of a Au ( 111 ) electrode with 4 - bromobenzenediazonium tetrafluoroborate ( BBD ) in acetonitrile ( ACN ) and 0 . 1 M HClO4 have been characterized by scanning tunneling microscopy ( STM ) .
 Chemical: Au ( 111 ); Chemical: 4 - bromobenzenediazonium tetrafluoroborate; Chemical: BBD; Chemical: acetonitrile; Chemical: ACN; Chemical: HClO4
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: Au ( 111 ); Chemical: 4 - bromobenzenediazonium tetrafluoroborate; Chemical: BBD; Chemical: acetonitrile; Chemical: ACN; Chemical: HClO4