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Monolayers of transition metal dichalcogenides ( TMDCs ) are atomically thin direct - gap semiconductors with potential applications in nanoelectronics , optoelectronics , and electrochemical sensing .
 Chemical: transition metal dichalcogenides; Chemical: TMDCs
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: transition metal dichalcogenides; Chemical: TMDCs