13918
This novel nanogenerator was systematically investigated and also demonstrated as a reliable power source , which can be directly used to not only lighten five commercial light - emitting diodes ( LEDs ) but also drive an implantable 3 - D microelectrode array for neural prosthesis without any energy storage unit or rectification circuit .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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