7573
In the solid state , chemically exchanging the nanocrystals ' surface - capping molecules provides a tailorable dielectric - to - metal transition exhibiting a 10 ( 10 ) range in DC conductivity and dielectric permittivity ranging from everywhere positive to everywhere negative throughout the visible - to - near - IR .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None