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Two - dimensional ( 2D ) layered transition metal dichalcogenides ( TMDs ) have recently attracted tremendous interest as potential valleytronic and nanoelectronic materials , in addition to being well - known as excellent lubricants in the bulk .
 Chemical: transition metal dichalcogenides; Chemical: TMDs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: transition metal dichalcogenides; Chemical: TMDs