22793
Both high - resolution transmission electron microscopy and scanning electron microscopy observations confirm that all - ZB GaAs / ( Ga , Mn ) As core - shell nanowires with smooth side surface are obtained when the Mn concentration is not more than 2 % and the growth temperature is 245 degrees C or below .
 Chemical: GaAs; Chemical: ( Ga , Mn ) As; Chemical: Mn
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: GaAs, ( Ga , Mn ) As, Mn 
Answer:
 Chemical: GaAs; Chemical: ( Ga , Mn ) As; Chemical: Mn