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The current - voltage measurement of the individual NW revealed that the vacancy layers of Ge ( 8 ) Sb ( 2 ) Te ( 11 ) and Ge ( 3 ) Sb ( 2 ) Te ( 6 ) decreased the electrical conductivity .
 Chemical: Ge ( 8 ) Sb ( 2 ) Te ( 11 ); Chemical: Ge ( 3 ) Sb ( 2 ) Te ( 6 )
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: Ge ( 8 ) Sb ( 2 ) Te ( 11 ); Chemical: Ge ( 3 ) Sb ( 2 ) Te ( 6 )